PEM06-01

会場:A01

時間:5 月 26 日 16:15-16:45

Recent advances in the low latitude ionospheric irregularities- a review
Recent advances in the low latitude ionospheric irregularities- a review
Patra Amit1∗ ; 大塚 雄一 2
PATRA, Amit1∗ ; OTSUKA, Yuichi2
11

National Atmospheric Research Laboratory, 2 名古屋大学太陽地球環境研究所
National Atmospheric Research Laboratory, 2 Solar-Terrestrial Environment Laboratory

Scientific research on the low latitude ionospheric irregularities continues to be of interest due to their adverse effects oncommunication and navigation systems. Understanding the physical processes and governing free energy sources leading todevelop forecasting capability is the current focus. Low latitude ionospheric E and F regions become unstable both during day
and night and irregularities are formed at different height regions. While understanding the F region processes with forcing
from below and extra-tropics has been paid attention, research activities are also focused on understanding fascinating detailsof E- and valley- region plasma processes, such as instabilities linked with tidal ion layer, intermediate layer and daytime 150
km echoes. Recent experiments conducted from low latitudes in the Asian sector have added new observational knowledge
on plasma irregularities. This paper will present the recent advancements made in understanding E and F region irregularities
including coupling between the two regions and daytime 150 km irregularities based on observations made in the Asian sector.

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PEM06-02

会場:A01

時間:5 月 26 日 16:45-17:00

全球大気圏電離圏モデルと高精細プラズマバブルシミュレーションの結合
Three-dimensional plasma bubble simulation driven by whole atmosphere-ionosphere
coupled model
横山 竜宏 1∗ ; 品川 裕之 1 ; 陣 英克 1
YOKOYAMA, Tatsuhiro1∗ ; SHINAGAWA, Hiroyuki1 ; JIN, Hidekatsu1
1
1

情報通信研究機構
National Institute of Information and Communications Technology

Equatorial plasma bubble (EPB) is a well-known phenomenon in the equatorial ionospheric F region. As it causes severe
scintillation in the amplitude and phase of radio signals, it is important to understand and forecast the occurrence of EPB froma space weather point of view. The development of EPB is known as a evolution of the generalized Rayleigh-Taylor instability.
Numerical modelings of the instability on the equatorial two-dimensional plane have been conducted since the late 1970’s, andthe nonlinear evolution of the instability has been clearly presented. Recently, three-dimensional (3D) modelings became popular
tools for further understanding of the development of EPB such as 3D structure of EPB, meridional wind effects and gravity wave
seeding.
We have developed a new 3D high-resolution bubble (HIRB) model for EPB and presented nonlinear growth of EPB whichshows very turbulent internal structures such as bifurcation and pinching. The eastward neutral wind in the evening produced
reverse-C shape of EPB as frequently observed by various instruments. We are trying to integrate the high-resolution model for
EPB with the whole atmosphere-ionosphere coupled model (GAIA) to study the growth of EPB under the realistic backgroundconditions. The background electric field and neutral wind partially controlled by forcing from the lower atmosphere may cause
the day-to-day variability of EPB occurrence.

キーワード: プラズマバブル, 赤道電離圏, シミュレーション, GAIA モデル, HIRB モデル
Keywords: plasma bubble, equatorial ionosphere, simulation, GAIA model, HIRB model

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PEM06-03

会場:A01

時間:5 月 26 日 17:00-17:15

Predawn depletion observed by GRBR and GPS networks in Southeast Asia
Predawn depletion observed by GRBR and GPS networks in Southeast Asia
WATTHANASANGMECHAI, Kornyanat1∗ ; YAMAMOTO, Mamoru1 ; SAITO, Akinori2 ; YOKOYAMA, Tatsuhiro3
WATTHANASANGMECHAI, Kornyanat1∗ ; YAMAMOTO, Mamoru1 ; SAITO, Akinori2 ; YOKOYAMA, Tatsuhiro3
1

Research Institute for Sustainable Humanosphere, Kyoto University, 2 Department of Geophysics, Graduate School of Science,
Kyoto University, 3 National Institute of Information and Communications Technology
1
Research Institute for Sustainable Humanosphere, Kyoto University, 2 Department of Geophysics, Graduate School of Science,
Kyoto University, 3 National Institute of Information and Communications Technology
Deep plasma depletion during substorm at predawn (0412-0436 LT) on 6 March 2012 was captured by GRBR network andwas confirmed by sparse GPS networks in Southeast Asia. The only available low-Earth-orbit (LEO) satellite during the event
is DMSPF15 with NE-to-SW overpass. GRBR network covering both hemispheres is aligned along the ˜100 E meridian. GPS
network including 12 GPS receivers sparsely distributes from 25 N to 1 N and from 99 E to 105 E. The supporting information
includes in-situ ion density data from DMSPF15 satellite, bottomside ionospheric data from ionosonde at Chumphon (10.72
N, 99.37 E) and data from the EAR at Kototabang (0.20 S, 100.32 E). This event was recognized by GRBR-TEC as having asteep TEC gradient that can trouble in positioning error on the aeronautical augmentation system. This finding was supported by
the GPS-TEC. In addition to the depletion, the GPS-TEC revealed the co-locating sub-mesoscale Medium-Scale-IonosphericDisturbance-like (MSTID-like) structures. Because the sparseness of the observation points has restricted the resolution of
the observations, several assumptions are necessary to interpret the data, such as the neglect of the temporal variations of theirstructures. As a result, a deep plasma depletion event was understood as having fossil plasma bubbles and sub-mesoscale MSTIDlike structures collocating. The wavefront of the plasma bubbles and the MSTID-like structures are found to be the same. This
event improves the predawn ionospheric information over Southeast Asia and is significant for being the prior-knowledge for theionospheric modeling.
キーワード: TEC, GRBR, GPS, predawn depletion, plasma bubble, Southeast Asia
Keywords: TEC, GRBR, GPS, predawn depletion, plasma bubble, Southeast Asia

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PEM06-04

会場:A01

時間:5 月 26 日 17:15-17:30

Effects of Pre-reversal Enhancement of E x B drift on the Latitudinal Extension of Plasma
Bubble in Southeast Asia
Effects of Pre-reversal Enhancement of E x B drift on the Latitudinal Extension of Plasma
Bubble in Southeast Asia
ABADI, Prayitno1∗ ; OTSUKA, Yuichi1 ; TSUGAWA, Takuya2 ; YOKOYAMA, Tatsuhiro2
ABADI, Prayitno1∗ ; OTSUKA, Yuichi1 ; TSUGAWA, Takuya2 ; YOKOYAMA, Tatsuhiro2
1

Solar Terrestrial Environment Laboratory (STEL), Nagoya University, 2 National Institute of Information and Communication
Technology (NICT)
1
Solar Terrestrial Environment Laboratory (STEL), Nagoya University, 2 National Institute of Information and Communication
Technology (NICT)
We investigated the effects of the F region bottomside altitude (h’F), maximum eastward electric field (E), duration of eastward
E, and the integral of eastward E on the latitudinal extension of equatorial plasma bubbles in the Southeast Asian sector using
the observations recorded by three GPS receivers and two ionosondes. The GPS receivers are installed at Kototabang (0.2 deg S,
100.3 deg E; 10.0 deg N magnetic latitude), Pontianak (0.02 deg S, 109.3 deg E; 8.9 deg S magnetic latitude), and Bandung (6.9
deg S, 107.6 deg E; 17.5 deg S magnetic latitude) in Indonesia. The ionosondes are installed at equatorial stations Chumphon(10.7 deg N, 99.4 deg E; 3.3 deg N magnetic latitude) in Thailand and Bac Lieu (9.3 deg N, 105.7 deg E; 1.7 deg N magnetic
latitude) in Vietnam. We analysed those observations acquired in the equinoctial months (March, April, September, and October)in 2010?2012 when the solar activity index F10.7 was in the range from 75 to 150. Assuming that plasma bubbles are the major
source of scintillations, the latitudinal extension of the bubbles was determined according to the S4 index. Our results show thatthe peak of h’F, maximum eastward E within the pre-reversal enhancement period, and the integral of eastward E are positively
correlated with the maximum latitude extension of plasma bubbles. Our statistical and observational findings emphasise thatplasma bubble extending more than 10?18 deg in latitude from the magnetic equator can be generated when the peak valueof h’F is greater than 250?450 km, the maximum vertical upward E x B drift is greater than 10?70 m/s, and the integral ofvertical upward E x B drift is greater than 50?250 m/s. In contrast, the duration of eastward E shows only weak correlation withthe maximum latitude extension of plasma bubbles. These findings suggest that the latitudinal extension of plasma bubbles iscontrolled mainly by the magnitude of eastward E and the peak value of h’F at the initial phase of development of plasma bubbles(or equatorial spread F) rather than by the duration of eastward E.
キーワード: equatorial ionosphere, plasma bubble, pre-reversal enhancement, scintillation
Keywords: equatorial ionosphere, plasma bubble, pre-reversal enhancement, scintillation

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PEM06-05

会場:A01

時間:5 月 26 日 17:30-17:45

中・低緯度トップサイド電離圏でのプラズマ密度に対する電子温度とイオン温度の傾向
Temperature trend of electron and ion with plasma density in middle and low latitude in
the topside ionosphere
柿並 義宏 1∗ ; 渡部 重十 2 ; Liu Huixin3
KAKINAMI, Yoshihiro1∗ ; WATANABE, Shigeto2 ; LIU, Huixin3
1
1

高知工科大学, 2 北海道情報大学, 3 九州大学
Kochi University of Technology, 2 Hokkaido Information University, 3 Kyuhsu University

It is important to understand energy flow from electron to ion and neutral species because main heat source of ionosphericplasma is photoelectron created by solar EUV. First, electrons are heated by photoelectrons, then heated electrons reduce theirenergy through the Column collision with ions. Finally, ions are cooled by inelastic collision with neutral species. Temperaturesof electron (Te), ion (Ti) and neutral species (Tn) get close to each other during night time due to lack of significant heat source.
Heating rate of electron by photoelectron is proportion to ambient plasma density while cooling rate of electron is proportion tosquare of the plasma density. Therefore, Te decreases with increase of electron density (Ne) in general. However, some satellite
results show Te increases with increase of Ne when Ne is high enough (more than about 106 cm−3 ). To understand the unexpected
Te, it is also important to know Ti variation because ion plays as a heat sink of electron. In this paper, we summarized correlationof Ne with Te and Ti observed by HINOTORI, CHAMP and ROCSAT-1 in the topside ionosphere. Since these satellites did notobserve Te and Ti simultaneously, Te, Ti and Ne measured with the incoherent scatter radars at Jicamaruca and Millstone Hill
are also shown. Using these data, we discuss possible cause of unexpected high Te in high Ne region.
キーワード: トップサイド電離圏, 電子温度, 電子密度, イオン温度, 光電子加熱, 中低緯度電離圏
Keywords: topside ionsophere, electron temperature, electron density, ion temperature, photoelectron, middle and low latitude

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PEM06-06

会場:A01

時間:5 月 27 日 09:00-09:30

Climatology of gravity waves in the mesosphere observed with the MU radar
Climatology of gravity waves in the mesosphere observed with the MU radar
RIGGIN, Dennis1∗
RIGGIN, Dennis1∗
1
1

GATS Inc.
GATS Inc.

The MU radar at Shigaraki, Japan has been operating periodically since 1986 and the extensive data set provides a unique
opportunity to study the seasonal variations of gravity waves. The data has recently been made available publicly to the scientificcommunity through a link in a large meta-database called IUGONET (Inter-university Upper atmosphere Global Observation
NETwork). In our study we focus on gravity waves observed during daylight hours between 60 and 97 km. Several days ofobservations were made during most months during the 29 years of operation. We calculate the vertical fluxes of horizontal
momentum and quantify the statistical characteristics and temporal variabilityof the waves. The spatial scales and intrinsic wave
properties are determined, as well as their response to seasonal changes in the background conditions. The background conditions
considered include changes in the mean horizontal winds and the atmospheric static stability. This study differs from those done
previously in that we make extensive use of probablity distribution functions as a complement to spectral analysis.
キーワード: mesosphere, gravity waved, climatology, Mu radar
Keywords: mesosphere, gravity waved, climatology, Mu radar

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PEM06-07

会場:A01

時間:5 月 27 日 09:30-09:45

ポーカーフラット及びトロムソ MF レーダーで観測された中間圏重力波と潮汐を含む背景場とのカップリングについて
On the coupling between gravity waves and background field including tides observedwith MF radar at Poker Flat & Tromso
木下 武也 1∗ ; 村山 泰啓 1 ; 川村 誠治 1 ; 野澤 悟徳 2 ; Hall Chris3
KINOSHITA, Takenari1∗ ; MURAYAMA, Yasuhiro1 ; KAWAMURA, Seiji1 ; NOZAWA, Satonori2 ; HALL, Chris3
1
1

情報通信研究機構, 2 名古屋大学, 3 The Arctic University of Norway
NICT, 2 Nagoya University, 3 The Arctic University of Norway

アラスカ・ポーカーフラット及びノルウェー・トロムソに設置された MF レーダーにより中間圏から下部熱圏における
中性風速データが 1990 年代後半以降観測されている。本研究では 10 年間 (1999〜2008 年) の上記観測データを用いて、潮汐を含む背景場に伴う短周期重力波活動の日内変動及び夏季と冬季の特性について調べる。
まず始めに、水平風速データから重力波と潮汐成分の抽出を行った。ここで、潮汐成分は 30 分平均データ 5 日間分からトレンドを除き、8, 12, 24 時間周期の正弦波をフィッティングして振幅と位相を 30 分ごとに求めた。一方、1〜4 時
間周期を持つ擾乱を短周期重力波として解析した。その結果、半日潮汐の位相に短周期重力波運動エネルギー (GW-KE)の半日周期成分の位相が約 10〜20 日間ロックされる様子を複数の年月で確認した。その中で、2000 年 11〜12 月に観測された事例では、ポーカーフラットとトロムソ両地点でほぼ同時期にロック現象が起こっていたが、 GW-KE の位相が180 度ずれていた (AGU2014) 。そこで、潮汐波と GW-KE の半日周期成分の 1 日コンポジット解析をした結果、ポーカー
フラットでは 11〜12 月において半日潮汐が東風時、1, 2, 5〜8 月では東風から西風に変わる時、トロムソでは 11〜2 月
において半日潮汐が西風時、5〜9 月では東風時に GW-KE が最大となることがわかった。従って、2000 年 11〜12 月に観測された事例は平均的によく起こりうる現象であると考えられる。今後は、8、24 時間周期及びそれ以外の成分について調べ、それぞれの地域で卓越する現象を特定し、その物理メカニズムを議論する予定である。
キーワード: 中層大気, 重力波, 潮汐波
Keywords: middle atmosphere, gravity waves, tidal waves

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PEM06-08

会場:A01

時間:5 月 27 日 09:45-10:00

Distributions of horizontal phase velocity of gravity waves observed by ANGWIN, using
a 3-D spectral analysis techniqueDistributions of horizontal phase velocity of gravity waves observed by ANGWIN, using
a 3-D spectral analysis technique
松田 貴嗣 1∗ ; 中村 卓司 2 ; 江尻 省 2 ; 堤 雅基 2 ; Taylor Michael J.3 ; Zhao Yucheng3 ;Pautet P.-Dominique3 ; Murphy Damian4 ; Moffat-Griffin Tracy5
MATSUDA, Takashi S.1∗ ; NAKAMURA, Takuji2 ; EJIRI, Mitsumu K.2 ; TSUTSUMI, Masaki2 ;TAYLOR, Michael J.3 ; ZHAO, Yucheng3 ; PAUTET, P.-dominique3 ; MURPHY, Damian4 ;MOFFAT-GRIFFIN, Tracy5
1

総合研究大学院大学, 2 国立極地研究所, 3 Utah State University, 4 Australian Antarctic Division, 5 British Antarctic Survey
SOKENDAI (The Graduate University for Advanced Studies), 2 National Institute of Polar Research, 3 Utah State University,
4
Australian Antarctic Division, 5 British Antarctic Survey
1

Atmospheric gravity waves (AGWs), which are generated in the lower atmosphere, transport significant amount of energy
and momentum into the mesosphere and lower thermosphere and cause the mean wind accelerations in the mesosphere. This
momentum deposit drives the general circulation and affects the temperature structure. Among many parameters to characterize
AGWs, horizontal phase velocity is very important to discuss their vertical propagation. Airglow imaging is a useful techniquefor investigating the horizontal structures of AGWs around mesopause. An international airglow imager (and other instruments)
network in the Antarctic, named ANGWIN (Antarctic Gravity Wave Imaging/Instrument Network) was started in 2011. Its
purpose is to understand characteristics of mesospheric gravity waves, and to study sources, propagation, breaking of the gravity
waves over the Antarctic and the effects on general circulation and upper atmosphere.
In this study, we compared distributions of horizontal phase velocities of gravity waves at around 90 km altitude over different
locations using our new statistical analysis method based on 3-D Fourier transform, developed by Matsuda et al. (2014). The
comparison has been carried out for the airglow imagers at four stations, that are Syowa (69S, 40E), Halley (76S, 27W), Davis(69S, 78E) and McMurdo (78S, 156E) out of the ANGWIN imagers, for the observation period between April 6 and May 21
in 2013. Not only horizontal propagation characteristics, gravity wave energies can also be quantitatively compared, indicatinga smaller GW activity in higher latitudes. The presentation will be focused on showing the performance of the new statisticaltechnique for studying gravity waves.

キーワード: 大気重力波, 大気光イメージング
Keywords: atmospheric gravity wave, airglow imaging

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PEM06-09

会場:A01

時間:5 月 27 日 10:00-10:15

Obervation of mesopause temperature by Kunming meteor radar
Obervation of mesopause temperature by Kunming meteor radar
YI, Wen1∗
YI, Wen1∗
1

Department of Geophysics & Planetary Sciences, University of Science & Technology of China, 2 National Key Laboratory ofElectromagnetic Environment,Research Institute of Radiowave Propagation
1
Department of Geophysics & Planetary Sciences, University of Science & Technology of China, 2 National Key Laboratory ofElectromagnetic Environment,Research Institute of Radiowave Propagation
A method to calibrate the initial temperatures derived from the meteor radar at Kunming in low latitudes area using SABER
temperatures is presented in this paper. Most of the meteors are observed in the local morning by Kunming meteor radar, therefore, the daily mean temperatures measured by the meteor radar were biased by local morning values. The daily temperatures
estimated using temperature gradient model technique are consistent well with the daily SABER temperatures which averaged
from 1600 to 0600 UT, but fluctuate greater than SABER temperatures. The correlation coefficient between the meteor and
SABER temperatures is 0.58. The Lomb Periodograms of meteor and SABER temperatures both exhibit clear seasonal andinterannual periodicities, with annual, semiannual, quasi 90 day and terannual oscillations. The results of harmonic fit analysis
show that the mean values are very close and these periodic oscillations have similar phases, however, the oscillation amplitudesof meteor temperatures are larger than SABER temperatures. The larger fluctuations of meteor temperatures were identified aslarger amplitude of the temperature oscillation components. Thus, the amplitude calibration was used to adjust the larger fluctuations of meteor temperatures. After temperature calibration was performed, the fluctuations of meteor and SABER temperatures
agree well, and the accuracy of the calibrated temperatures has been significantly improved. In addition, the temperatures determined by the temperature gradient model technique could effectively be used to study the waves and oscillations in the mesopause
region.
キーワード: meteor radar, mesopause temperature, temperature gradient, temperature oscillation
Keywords: meteor radar, mesopause temperature, temperature gradient, temperature oscillation

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PEM06-10

会場:A01

時間:5 月 27 日 10:15-10:30

地磁気静穏日変化振幅の長期変動の特徴について
Characteristics of long-term variation of the geomagnetic solar quiet daily variation
新堀 淳樹 1∗ ; 小山 幸伸 2 ; 能勢 正仁 2 ; 堀 智昭 3 ; 大塚 雄一 3 ; 谷田貝 亜紀代 3
SHINBORI, Atsuki1∗ ; KOYAMA, Yukinobu2 ; NOSE, Masahito2 ; HORI, Tomoaki3 ; OTSUKA, Yuichi3 ;YATAGAI, Akiyo3
1

京都大学生存圏研究所, 2 京都大学地磁気センター, 3 名古屋大学太陽地球環境研究所
Research Institute for Sustainable Humanosphere (RISH), Kyoto University, 2 World Data Center for Geomagnetism, Kyoto
University, 3 Solar-Terrestrial Environment Laboratory, Nagoya University

1

Characteristics of long-term variation in the amplitude of solar quiet (Sq) geomagnetic field daily variation have been investigated using 1-h geomagnetic field data obtained from 69 geomagnetic observation stations within the period of 1947 - 2013.
The Sq amplitude observed at these geomagnetic stations showed a clear dependence on the 10 - 12 year solar activity cycle andtended to be enhanced during each solar maximum phase. The Sq amplitude was the smallest around the minimum of solar cycle
23/24 in 2008 - 2009. The relationship between the solar F10.7 index and Sq amplitude was approximately linear but about 53 %of geomagnetic stations showed a weak nonlinear relation to the solar F10.7 index. In order to remove the effect of solar activity
seen in the long-term variation of the Sq amplitude, we calculated a linear or second-order fitting curve between the solar F10.7
index and Sq amplitude during 1947 - 2013, and examined the residual Sq amplitude, which is defined as the deviation from thefitting curve. As a result, the majority of trends in the residual Sq amplitude that passed through a trend test showed negativevalues over a wide region. This tendency was relatively strong in Europe, India, the eastern part of Canada, and New Zealand.
The relationship between the magnetic field intensity at 100 km altitude and residual Sq amplitude showed an anti-correlation
for about 71 % of the geomagnetic stations. The decreasing trend of the residual Sq amplitude implies that the ionospheric Sq
current intensity tends to weaken due to a decrease of the ionospheric conductivity associated with an increase of the ambient
magnetic field intensity. Furthermore, the residual Sq amplitude at the equatorial station (Addis Ababa) was anti-correlated withthe absolute value of the magnetic field inclination. The decreasing trend of the residual Sq amplitude in the equatorial region
indicates movement of the equatorial electrojet due to the secular variation of the ambient magnetic field.
キーワード: 太陽活動, 地磁気日変化, 電離圏電気伝導度, 電離圏ダイナモ, 地磁気永年変化, 熱圏風Keywords: Solar activity, Geomagnetic solar quiet daily variation, Ionospheric conductivity, Ionospheric dynamo, Secular variation of geomagnetic field, Thermospheric wind

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PEM06-11

会場:A01

時間:5 月 27 日 10:30-10:45

レーダー長期観測による赤道域の中間圏・下部熱圏における大気力学過程の研究
Equatorial MLT dynamics using long-term radar observation
松本 直樹 1∗ ; 新堀 淳樹 1 ; 津田 敏隆 1
MATSUMOTO, Naoki1∗ ; SHINBORI, Atsuki1 ; TSUDA, Toshitaka1
1
1

京都大学生存圏研究所
Research Institute for Sustainable Humanosphere
赤道域では、対流圏で励起された大気波動が上方伝搬する過程で、成層圏下部における準 2 年周期振動（Stratospheric Quasi-Biennial Oscillation：SQBO、平均周期は 26-28 ヶ月）、成層圏上部の半年周期振動（Semi-Annual Oscillation:SAO）および MLT 領域では成層圏と逆相の半年周期振動（MSAO）を駆動しているとされている。
本研究では、インドネシアで長期間運用している流星レーダー等のデータを用いて、赤道域の中間圏・下部
熱圏（Mesosphere-Lower Thermosphere: MLT）の高度 70-110 km における風速の周期振動ならびにそれら
不規則変動を研究する。特に MSAO の西向き風が 2-4 月（北半球の春分季）に 2 年乃至 3 年の不定期間隔で非常に大きくなる特異現象（Mesospheric Quasi-Biennial Enhancement:MQBO）に着目する。
M-QBE は秋分季（9-10 月）に発生せず、2-4 月頃に限定的に発生する。よって 1 年周期を律するプロセスが重畳することで、M-QBE が 2-4 月のみに発生すると考えられるが、そのメカニズムは未解明である。
本研究では 2 つのメカニズムを検討した。
（１）
南北風との相関赤道 MLT 域では南北風が夏半球から冬半球に風が吹くことから、１年周期（AO: Annual Oscillation）を示す。南北風と東西風とが結合する何らかのプロセスがあるならば、東西風に 1 年の周期性を生み出しうる。
実際の観測により東西風と南北風の長期変動を調べると、南北風 AO と東西風 SAO の長期変動の間に同様の変化傾向が見られた。これにより、南北風と東西風とが結合する何らかのプロセスが存在する可能性が示唆された。
（２）
大気重力波による M-QBE の駆動
M-QBE の西向き風増大と MLT 高度での大気重力波強度の増加が明らかに同期していたことが先行研究で報告されている（N.V. Rao et al., 2012）。したがって、大気重力波が M-QBE を駆動している可能性がある。
しかし、大気重力波と M-QBE の関係を明らかにするには、重力波の強度（風速分散）だけでは不十分で、波動にともなう運動量フラックスを測定する必要がある。
運動量フラックスは水平風と鉛直風の摂動分の分散（u w ）だが、2 次の微小量であることから観測は容易ではない。大型大気レーダーについて、beam pair 法を用いて u w を測定する画期的な方法が開発された（Vincent and Reid, 1983）。しかし、MU レーダー級の高性能大型レーダーは世界に数ヶ所しかないため、大気波動の効果の全球分布を知るには新たな計測手法の開発が求められた。
MU レーダーより小型簡便な流星レーダーを用いて beam pair 法を模擬し、u w を推定する手法が提案された（Hocking, 2005）。しかし、その測定精度に疑義が提示されている。
我々はインドネシアで同一仕様の 2 台の流星レーダーを同じ緯度（赤道上）で水平に約 4,000 km 離れた観測点で運用している。これら 2 台の流星レーダーによる u w の測定結果を統計的に比較し、観測手法の妥当性を検討した。
まず、約 4,000 km 離れた東西端のパプア（Biak）と西スマトラ（Koto Tabang）で 2011 年以降に断続的に行われた同時観測のデータを用い、Hocking 法で u w を解析し結果を比較する。運動量フラックスのよく一致している期間は、Koto Tabang および Biak の両者においてデータ利用率が高い期間に含まれている. このことから,Koto Tabang および Biak における観測によって, ノイズではない, 運動量フラックスの類似した変動を観測することができたといえる.
また、Koto Tabang では 10 年以上観測が継続されていることから、季節変動および年々変動、さらに高度層による差違を検討したところ、2 月と 8 月に運動量フラックスが大きな正の値を取り,6 月と 11 月に小さな値あるいは負の値をとる傾向が見受けられた。
M-SQO が大気波動の影響を受けているならば、u w にも半年周期が現れると期待されるが、本研究により、その予想と矛盾しない観測結果を得た。今後、大気重力波が MQBE を駆動している具体的なメカニズムを解明していくことが重要である。

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PEM06-11

会場:A01

時間:5 月 27 日 10:30-10:45

キーワード: 中間圏・下部熱圏, 準二年周期振動, 運動量フラックス
Keywords: Mesosphere and Lower Thermosphere, Quasi-biennual Oscillation, momentum flux, Hocking

2/2

PEM06-12

会場:A01

時間:5 月 27 日 11:00-11:30

Deep ionospheric hole created by sudden stratospheric warming in the post-midnight
ionosphere
Deep ionospheric hole created by sudden stratospheric warming in the post-midnight
ionosphere
GONCHARENKO, Larisa1∗ ; COSTER, Anthea1 ; ZHANG, Shunrong1 ; ERICKSON, Phillip1 ; APONTE, Nestor2
GONCHARENKO, Larisa1∗ ; COSTER, Anthea1 ; ZHANG, Shunrong1 ; ERICKSON, Phillip1 ; APONTE, Nestor2
1
1

Massachusetts Institute of Technology, Haystack Observatory, 2 Arecibo Observatory, SRI International
Massachusetts Institute of Technology, Haystack Observatory, 2 Arecibo Observatory, SRI International

Multiple observational studies have demonstrated large ionospheric variations associated with sudden stratospheric warming(SSW) events during the daytime, but only limited evidence of ionospheric disturbances during the night-time was reported up
to now. We use observations by GPS TEC receivers and Arecibo and Millstone Hill incoherent scatter radars to investigate largescale disturbances in the nighttime ionosphere for several SSW events. We report a deep decrease in TEC that reaches ˜70%of the background level and is observed between the local midnight and local sunrise (6-12UT). This decrease is observed forseveral consecutive days in the range of latitudes from ˜60oS to ˜45oN. It is accompanied by a strong downward plasma motion
and significant decrease in ion temperature, as observed by both Arecibo and Millstone Hill radars. We discuss variations inelectric field and F-region dynamics as possible drivers of this behavior.
キーワード: sudden stratospheric warming, atmospheric coupling, ionosphere
Keywords: sudden stratospheric warming, atmospheric coupling, ionosphere

1/1

PEM06-13

会場:A01

時間:5 月 27 日 11:30-11:45

Spatial and temporal extent of ionospheric anomalies during sudden stratospheric warmings in the daytime ionosphere
Spatial and temporal extent of ionospheric anomalies during sudden stratospheric warmings in the daytime ionosphere
GONCHARENKO, Larisa1∗ ; COSTER, Anthea1 ; ZHANG, Shunrong1 ; BENKEVITCH, Leonid1 ; GALKIN, Ivan2
GONCHARENKO, Larisa1∗ ; COSTER, Anthea1 ; ZHANG, Shunrong1 ; BENKEVITCH, Leonid1 ; GALKIN, Ivan2
1
1

Massachusetts Institute of Technology, Haystack Observatory, 2 University of Massachusetts, Lowell
Massachusetts Institute of Technology, Haystack Observatory, 2 University of Massachusetts, Lowell

Recent studies have demonstrated large variations in the daytime ionosphere during sudden stratospheric warmings (SSW)
and a debate has started about the relative importance of solar and lunar tides in these ionospheric variations. In this study
we use GPS TEC data from the MIT Haystack Observatory Madrigal database along 75o W collected in 2000-2014 as well as
several digisondes to examine the magnitude and spatio-temporal extent of ionospheric anomalies related to SSW. To separate
ionospheric anomalies during SSW from regular ionospheric behavior, we develop empirical models of ionospheric parameters(TEC, NmF2) using available long-term records. The models describe variations in parameters for each lon/lat bin (or digisonde
location) as a function of solar activity, geomagnetic activity, day of year, and local time. Ionospheric anomalies are obtained as
difference between observations and empirical model. Analysis of anomalies shows that they are observed for both major andminor SSW events, reaching 50-100% variation from expected seasonal behavior for major SSW events and 30-60% variation
for minor SSW events. SSW-associated variations are pronounced more strongly in NmF2 than in TEC. The largest variations in
TEC in the daytime are observed both in the crests of equatorial ionization anomaly and at 40-60o S (geodetic). Variations in TEC
and NmF2 are even discernable up to high latitudes (70o S) in the Southern Hemisphere and mid-latitudes (42o N) in the Northern
Hemisphere. We discuss several possible mechanisms contributing to these anomalies, focusing on solar and lunar semidiurnal
tides and interhemispheric coupling.

キーワード: sudden stratospheric warming, atmospheric coupling, ionosphere
Keywords: sudden stratospheric warming, atmospheric coupling, ionosphere

1/1

PEM06-14

会場:A01

時間:5 月 27 日 11:45-12:00

Longitudinal Variations of Low-Latitude Gravity Waves and Their Impacts on the Ionosphere
Longitudinal Variations of Low-Latitude Gravity Waves and Their Impacts on the Ionosphere
CULLENS, Chihoko1∗ ; ENGLAND, Scott1 ; IMMEL, Thomas1
CULLENS, Chihoko1∗ ; ENGLAND, Scott1 ; IMMEL, Thomas1
11

University of California Berkeley
University of California Berkeley

The lower atmospheric forcing has important roles in the ionospheric variability. Previous study suggested that atmospherictides from the troposphere induce the wavenumber 4 signatures on the ionosphere. However, influences of lower atmosphericgravity waves on the ionospheric variability are still not clear due to the simplified gravity wave parameterizations in general circulation models (GCMs) and the limited knowledge of gravity wave distributions. In this study, we aim to study the longitudinalvariations of gravity waves and their impacts on the ionospheric variability.
Variations of lower atmospheric gravity waves are characterized using SABER temperature observations from 2002 to 2012
and also the physically based gravity wave parameterization in the Specified-Dynamics Whole Atmosphere Community Climate
Model (SD-WACCM). Longitudinal variations of gravity waves from SABER and WACCM show the largest variability in JuneAugust at low latitudes. We have implemented these low-latitude gravity wave variations into the thermosphere-ionospheremesosphere-electrodynamics general circulation model (TIME-GCM) to study the responses of the ionosphere. TIME-GCM
shows that wavenumber 3-4 components of TEC variations in June-August are increased by ˜10-15% with the longitudinal variations of gravity waves but there are no significant changes in other months. Potential mechanisms of TEC responses to gravity
wave variations will be discussed.
キーワード: Gravity Wave, Ionosphere, Tides
Keywords: Gravity Wave, Ionosphere, Tides

1/1

PEM06-15

会場:A01

時間:5 月 27 日 12:00-12:15

中低緯度で観測された LF 帯標準電波位相の周期と MSTID の周期との関連性
Relationship between phase variation of LF signals and GPS-TEC variations related with
MSTIDs at mid-low latitudes
大矢 浩代 1∗ ; 西岡 未知 2 ; 塩川 和夫 3 ; 土屋 史紀 4
OHYA, Hiroyo1∗ ; NISHIOKA, Michi2 ; SHIOKAWA, Kazuo3 ; TSUCHIYA, Fuminori4
1

千葉大学大学院工学研究科, 2 情報通信研究機構, 3 名古屋大学太陽地球環境研究所, 4 東北大学大学院理学研究科惑星プ
ラズマ・大気研究センター
1
Graduate School of Engineering, Chiba University, 2 National Institute of Information and Communications Technology, 3 SolarTerrestrial Environment Laboratory, Nagoya University, 4 Planetary Plasma and Atmospheric Research Cemter, Graduate Schoolof Science, Tohoku University

It is known that phase of LF transmitter signals largely varies in nighttime rather than in daytime, because uniform solar
ionization in daytime makes the D-region ionosphere smoother. However, the cause of the nighttime phase variations has notbeen revealed. In this study, we focus on the periods of the phase variations of the nighttime LF transmitter signals observed inJapan and South-east Asia. As for Japanese data, we investigated the periods of LF signals observed in 16 April, and 6 May, 2007
by wavelet analysis. The propagation path (40 kHz) of the LF signals was located at Fukushima to Kagoshima. Both on 16 April
and 6 May, 2007, phase variations with a period of about 50 minute was seen at around 11:00 UT and 15:00 UT, respectively.
An occurrence of medium-scale traveling ionospheric disturbances (MSTIDs) was confirmed at 15:00 UT on 6 May, 2007 fromGPS Total Electron Content (TEC) data, while the MSTIDs did not occur on 16 April, 2007. In the presentation, we will discuss
the periods of LF phase variations and GPS-TEC variations in more detail.

1/1

PEM06-16

会場:A01

時間:5 月 27 日 12:15-12:30

電離層 E 領域の Ca+密度と F 領域の中規模伝搬性電離圏擾乱の初同時観測
First simultaneous observation of Ca+ densities in the E region and MSTIDs in the F region
江尻 省 1∗ ; 津田 卓雄 2 ; 西山 尚典 1 ; 阿保 真 3 ; 西岡 未知 4 ; 丸山 隆 4 ; 齊藤 昭則 5 ; 中村 卓司 1
EJIRI, Mitsumu K.1∗ ; TSUDA, Takuo2 ; NISHIYAMA, Takanori1 ; ABO, Makoto3 ; NISHIOKA, Michi4 ;MARUYAMA, Takashi4 ; SAITO, Akinori5 ; NAKAMURA, Takuji1
1

国立極地研究所, 2 電気通信大学, 3 首都大学東京大学院システムデザイン研究科, 4（独）情報通信研究機構, 5 京都大学
大学院理学研究科地球物理学教室
1
National Institute of Polar Research, 2 The University of Electro-Communications, 3 Graduate School of System Design, Tokyo
Metropolitan University, 4 National Institute of Information and Communications Technology, 5 Department of Geophysics, Graduate School of Science, Kyoto University

In the mesosphere and lower thermosphere region, there are permanent layers of metal atoms and ions, the source of which
is vaporization of cosmic dust and meteoroids during their entry into the Earth’s atmosphere. Some metal atom layers e.g. Na,
K, Ca, and Fe layers, and only Ca+ (Calcium ion) can be observed by ground-based resonance scattering lidars. The National
Institute of Polar Research (NIPR) is developing a new resonance scattering lidar system with a frequency-tunable laser. The
lidar transmitter is based on injection-seeded, pulsed alexandrite laser for 768-788 nm and a second-harmonic generation (SHG)
unit for 384-394 nm. The new lidar is able to measure density variations of minor constituents including Ca+ (393.477 nm). As
a part of the development, observation tests are carried out at NIPR (35.7N, 139.4E) since 2013, and we got the first light fromCa+ layer on 21 August, 2014. The Ca+ density profiles were obtained for ∼5 hours (23:13 LT-28:28 LT) with temporal andheight resolutions of 1 min and 15 m, respectively. During the night, high density and narrow Ca+ layer was observed. The
layer descended from ∼107 km to 99 km with quasi-periodic density perturbations until ∼17 UT and then stayed at around 99
km until sunrise. At the same night, sporadic E (Es ) layer was observed with an ionosonde at Kokubunji by National Instituteof Information and Communications Technology (NICT) (35.7N, 139.5E), also medium scale traveling ionospheric disturbances(MSTIDs) were observed with the dense GPS receiver network (GEONET). In this presentation, we compare these data in detailand discuss relationships between observed Ca+ density perturbations, Es layer and MSTIDs
キーワード: 共鳴散乱ライダー, カルシウムイオン, 中規模伝搬性電離層擾乱, GPS-TEC, スポラディック E 層
Keywords: resonance scattering lidar, Ca+, medium scale traveling ionospheric disturbances, GPS-TEC, sporadic E layer

1/1

PEM06-17

会場:A01

時間:5 月 27 日 12:30-12:45

Excitation of large-scale gravity waves in the upper thermosphere by interplanetary fluctuations
Excitation of large-scale gravity waves in the upper thermosphere by interplanetary fluctuations
GUO, Jianpeng1∗ ; LIU, Huixin2
GUO, Jianpeng1∗ ; LIU, Huixin2
11National Space Science Center, Chinese Academy of Sciences, 2 Earth and Planetary Science Division, Kyushu University
National Space Science Center, Chinese Academy of Sciences, 2 Earth and Planetary Science Division, Kyushu University

Fluctuations on timescales of minutes to hours are common in the solar wind. When the fluctuations encounter the Earth, they
could induce impulsive auroral intensification, which, in turn, excite gravity waves in the auroral regions. These gravity waves,particularly large-scale (>˜1000 km) gravity waves, will give rise to traveling atmospheric disturbances with typical amplitudes
of 20˜40% in the upper thermosphere. We report here the detection of full constructive interference between two large-scale
gravity waves excited in northern and southern auroral regions by an interplanetary shock, and the detection of extremely efficient multiple excitation of large-scale gravity waves by a long-duration Alfven wave train carried by a high-speed stream.
キーワード: interplanetary fluctuations, gravity wave, traveling atmospheric disturbances, thermosphere
Keywords: interplanetary fluctuations, gravity wave, traveling atmospheric disturbances, thermosphere

1/1

PEM06-18

会場:A01

時間:5 月 27 日 14:15-14:45

Quasi-two day wave related variability in the background dynamics and composition of
the MTI system
Quasi-two day wave related variability in the background dynamics and composition of
the MTI system
CHANG, Loren1∗ ; YUE, Jia2 ; WANG, Wenbin3 ; WU, Qian3 ; MEIER, R.r.4
CHANG, Loren1∗ ; YUE, Jia2 ; WANG, Wenbin3 ; WU, Qian3 ; MEIER, R.r.4
1

Institute of Space Science, National Central University, Jhongli, Taoyuan County, Taiwan, 2 Center for Atmospheric Science,
Hampton University, Virginia, USA, 3 High Altitude Observatory, National Center for Atmospheric Research, Boulder, Colorado,
USA, 4 School of Physics, Astronomy, and Computational Sciences, George Mason University, Virginia, USA
1
Institute of Space Science, National Central University, Jhongli, Taoyuan County, Taiwan, 2 Center for Atmospheric Science,
Hampton University, Virginia, USA, 3 High Altitude Observatory, National Center for Atmospheric Research, Boulder, Colorado,
USA, 4 School of Physics, Astronomy, and Computational Sciences, George Mason University, Virginia, USA
Dissipating planetary waves in the mesosphere and lower thermosphere (MLT) region may cause changes in the background
dynamics of that region, subsequently driving variability throughout the broader thermosphere / ionosphere system via mixing
due to the induced circulation changes. We report the results of case studies examining the possibility of such coupling during thenorthern winter in the context of the quasi-two day wave (QTDW) - a planetary wave that recurrently grows to large amplitudes
from the summer MLT during the post-solstice period. Six distinct QTDW events between 2003 and 2011 are identified in the
MLT using SABER (Sounding of the Atmosphere using Broadband Emission Radiometry) temperature observations. Concurrent
changes to the background zonal winds, zonal mean column O/N2 density ratio, and ionospheric total electron content (TEC)
are examined using datasets from TIDI (TIMED Doppler Interferometer), GUVI (Global Ultraviolet Imager), and GIMs (Global
Ionospheric Maps), respectively. We find that in the 5 - 10 days following a QTDW event, the background zonal winds in the
MLT show patterns of eastward and westward anomalies in the low and mid-latitudes consistent with past modeling studies on
QTDW-induced mean wind forcing, both below and at turbopause altitudes. This is accompanied by potentially related decreases
in zonal mean thermospheric column O/N2, as well as to low latitude TECs. The recurrent nature of the above changes during thesix QTDW events examined point to an avenue for vertical coupling via background dynamics and chemistry of the thermosphere/ ionosphere not previously observed.
キーワード: quasi-two day wave, ionosphere, thermosphere, mesosphere, composition, dynamics
Keywords: quasi-two day wave, ionosphere, thermosphere, mesosphere, composition, dynamics

1/1

PEM06-19

会場:A01

時間:5 月 27 日 14:45-15:00

Simultaneous observation of planetary waves in the mesosphere and ionosphere
Simultaneous observation of planetary waves in the mesosphere and ionosphere
ESPY, Patrick1∗ ; STRAY, Nora2 ; HIBBINS, Robert1
ESPY, Patrick1∗ ; STRAY, Nora2 ; HIBBINS, Robert1
1

NTNU, Trondheim and Birkeland Centre for Space Science, Bergen, Norway, 2 Norwegian University of Science and Technology (NTNU), Trondheim, Norway
1
NTNU, Trondheim and Birkeland Centre for Space Science, Bergen, Norway, 2 Norwegian University of Science and Technology (NTNU), Trondheim, Norway
How variations of the neutral atmosphere, in particular planetary wave activity in the mesosphere-lower thermosphere (MLT),
drive variations in the ionosphere has been the subject of recent attention. A method has been developed to observe planetary
wave activity in the northern hemisphere (50-66 ⁰ N) MLT using neutral atmosphere winds derived from meteor trail drifts observed by a longitudinal chain of Super Dual Auroral Radar Network (SuperDARN) radars. The method allows for the removalof tidal effects and provides the temporal variation of the wavenumber 1 and 2 amplitudes without the spatial-temporal aliasingpresent in satellite observations. The method has been extended to utilize the critical plasma frequency and virtual height of theionospheric F-layer derived from a longitudinal chain of ionosondes. Details of the method applied to both the meteor radar andionosonde data will be presented, and the amplitudes and temporal variations of the wavenumber 1 and 2 amplitudes in both the
MLT and the F region will be compared.
キーワード: Planetary wave, Mesosphere, Lower Thermosphere, Ionosphere
Keywords: Planetary wave, Mesosphere, Lower Thermosphere, Ionosphere

1/1

PEM06-20

会場:A01

時間:5 月 27 日 15:00-15:15

Ground-based mesopause temperatures at high-latitude over Yakutia:Comparison with
SABER measurements
Ground-based mesopause temperatures at high-latitude over Yakutia:Comparison with
SABER measurements
AMMOSOVA, Anastasia1∗ ; AMMOSOV, Petr1 ; GAVRILYEVA, Galina1 ; KOLTOVSKOI, Igor1
AMMOSOVA, Anastasia1∗ ; AMMOSOV, Petr1 ; GAVRILYEVA, Galina1 ; KOLTOVSKOI, Igor1
1
1

ShICRAShICRA
Ground-based mesopause temperature at high-latitude over Yakutia: Comparison with SABER measurements
Yu. G. Shafer Institute of Cosmophysical Research and Aeronomy
Petr Ammosov; Galina Gavrilyeva; Anastasia Ammosova; Igor Koltovskoi
tenyka@rambler.ru

Rotational temperatures obtained from the O2 Atmospheric (0?1) nightglow band, with an infrared spectrograph at the
Maimaga station (63 N, 129.5 E) for the period September 2002 to March 2013 are presented. Time series includes the yearsof maximum and minimum solar activity. The set of spectrograph data has been used to analyze the seasonal behaviour of themesopause temperatures. Atmospheric temperatures deduced from infrared spectrograph and from satellite observations with theSounding of the Atmosphere using Broadband Emission Radiometry (SABER) instrument on board the TIMED satellite, havealso been compared.
The temperatures measured during the satellite passes at distances not larger than 300 km from the intersection of the spectrograph sighting line with the oxygen emitting layer (˜94 km) have been compared. A seasonal dependence is observed regarding
the difference between the ground based and satellite measurements. However, the time variations in the temperature obtainedwith the ground based device and on the satellite are similar. Based on the performed analysis, it has been concluded that a seriesof oxygen rotational temperatures can be used to study temperature variations on different time scales, including long-term trends
at the temperature emission altitude (˜94 km).

キーワード: mesopause temperature, O2 airglow, SABER measurements
Keywords: mesopause temperature, O2 airglow, SABER measurements

1/1

PEM06-21

会場:A01

時間:5 月 27 日 15:15-15:30

All-sky measurements of short period waves nightglow emissions
All-sky measurements of short period waves nightglow emissions
KOLTOVSKOI, Igor1∗ ; AMMOSOV, Petr1 ; GAVRILYEVA, Galina1 ; AMMOSOVA, Anastasia1
KOLTOVSKOI, Igor1∗ ; AMMOSOV, Petr1 ; GAVRILYEVA, Galina1 ; AMMOSOVA, Anastasia1
1
1

Yu.G. Shafer Institute of Cosmophysical Research and Aeronomy
Yu.G. Shafer Institute of Cosmophysical Research and Aeronomy

Will present the results of statistical analysis of the parameters of internal gravity waves registered on the variations of emission hydroxyl molecule. Wave patterns registered infrared all-sky camera installed on the optical station Maimaga (Yakutia).
Analyzed data received during the winter period 2008-2013. 118 waves were registered, most of which propagated in a westerly direction. For the wave length range from 15 - 70 km (average value is - 29km) observed horizontal phase velocity varies
from 17 to 140.8 m / s (average is -57m / s) and the estimated periods are within 7-40 min (the average is - 9min). Statisticalcharacteristics of the waves do not differ from the results of the registration of such waves at middle and low latitudes. The
azimuthal distribution of the direction of wave propagation is consistent with the theory of filtering background wind waves in
the middle atmosphere. Probable sources of waves are assumed to mountain ranges, located 200 km to the east of the place ofobservation. There are a few large values of the average wavelength and wave propagation velocity than those registered at lower
latitudes. Apparently, this is due to lower energy loss and wave velocity in passing from the source to the mesosphere, although
not excluded for other reasons.
It is planned to identify all-sky measurements of short period waves in the green emission recording OI (557,7 nm) in thevisible wavelength of the spectrum (the height of the airglow ˜96 km). Will present the results of observations at two different
heights (˜87 and 97 km).
キーワード: internal gravity waves, mesosphere, hydroxyl
Keywords: internal gravity waves, mesosphere, hydroxyl

1/1

PEM06-22

会場:A01

時間:5 月 27 日 15:30-15:45

リチウム放出実験による昼間および月夜の熱圏中性大気風プロファイル
Thermospheric neutral wind profile in daytime and moonlit midnight by Lithium release
experiments
山本 真行 1∗ ; 木原 大城 1 ; 柿並 義宏 1 ; 渡部 重十 2 ; ラーセン ミゲル 3 ; 山本 衛 4 ; 羽生 宏人 5 ;阿部 琢美 5 ; パフ ロバート 6
YAMAMOTO, Masa-yuki1∗ ; KIHARA, Daiki1 ; KAKINAMI, Yoshihiro1 ; WATANABE, Shigeto2 ; LARSEN, Miguel3 ;YAMAMOTO, Mamoru4 ; HABU, Hiroto5 ; ABE, Takumi5 ; PFAFF, Robert61

高知工科大学, 2 北海道情報大学, 3 Clemson University, 4 京都大学生存研研究所, 5 JAXA 宇宙科学研究所, 6 NASA/Goddard
Space Flight Center
1
Kochi University of Technology, 2 Hokkaido Information University, 3 Clemson University, 4 RISH, Kyoto University, 5 ISAS/JAXA,
6
NASA/Goddard Space Flight Center

Neutral wind profiles were observed in lower thermosphere at about between 90 km and 130 km altitude by using resonancescattering light of sunlit and moonlit Lithium (Li) vapor released from sounding rockets in daytime and midnight (almost fullmoon condition) in 2013. As a target of the Daytime Dynamo campaign, Li release experiment was operated at Wallops Flight
Facility (WFF) of NASA, U.S.A. in July, 2013, while the same kind of experiment in midnight was carried out in Uchinoura
Space Center (USC) of JAXA, Japan also in July 2013. Since imaging signal-to-noise (S/N) condition of the both experiments
was so severe, we conducted to apply airborne observation for Li tracers imaging so as to reduce the illuminating intensity ofbackground skies as an order of magnitude.
Two independent methods for calculating the wind profile were applied to the image sequences obtained by the airborne imaging by special Li imagers aboard the airplanes in order to derive precise information of Li tracers motion under the conditionof single observation site moving along the aircraft path in the lower stratosphere. Slight feedback motion of the aircraft 3-axes
attitude changes (rolling, yawing and pitching) was considered for obtaining precise coordinates on each snapshot. Anotherapproach is giving a simple mathematic function for wind profile to resolve the shape displacement of the imaged Li tracers. As
a result, a wind profile in daytime thermosphere was calculated in a range between 20 and 95 m/s with some fluctuated parts
possibly disturbed by wind shears. In this paper, we will introduce the method of wind profile calculation and final result of the
profiles.

キーワード: 熱圏, 中性大気風プロファイル, リチウム放出, 航空機観測, 手法, 観測ロケット
Keywords: Thermosphere, Neutral wind profile, Lithium release, Airborne observation, Method, Sounding rocket

1/1

PEM06-23

会場:A01

時間:5 月 27 日 15:45-16:00

Atmospheric dynamics InfraStructure in Europe: The ARISE project
Atmospheric dynamics InfraStructure in Europe: The ARISE project
BLANC, Elisabeth1 ; KERO, Johan11∗ ; CERANNNA, Lars2 ; HAUCHECORNE, Alain3 ; CHARLTON-PEREZ, Andrew4 ;KVAERNA, Tormod5 ; RIPEPE, Maurizio6 ; RAPP, Markus7 ; EVERS, Laslo8 ; LUEBKEN, Franz-jozef9 ;BLINDHEIM, Sandra10 ; ESPY, Patrick12 ; LASTOVICKA, Jan13 ; BOSSU, Remy14 ; CAMMAS, Jean-pierre15 ;KAEMPFER, Niklaus16 ; PRICE, Colin17 ; MULLIGAN, Frank18 ; VOGFJORD, Kristin19 ;RAMBOLAMANANA, Gerard20 ; IONESCU, Constantin21 ; WALLENSTEIN, Nicolau22 ; AGREBI, Abdelouaheb23 ;DIAWARA, Adama24
BLANC, Elisabeth1 ; KERO, Johan11∗ ; CERANNNA, Lars2 ; HAUCHECORNE, Alain3 ; CHARLTON-PEREZ, Andrew4 ;KVAERNA, Tormod5 ; RIPEPE, Maurizio6 ; RAPP, Markus7 ; EVERS, Laslo8 ; LUEBKEN, Franz-jozef9 ;BLINDHEIM, Sandra10 ; ESPY, Patrick12 ; LASTOVICKA, Jan13 ; BOSSU, Remy14 ; CAMMAS, Jean-pierre15 ;KAEMPFER, Niklaus16 ; PRICE, Colin17 ; MULLIGAN, Frank18 ; VOGFJORD, Kristin19 ;RAMBOLAMANANA, Gerard20 ; IONESCU, Constantin21 ; WALLENSTEIN, Nicolau22 ; AGREBI, Abdelouaheb23 ;DIAWARA, Adama24
1

CEA France, 2 BGR Germany, 3 CNRS France, 4 UREAD United Kingdom, 5 NORSAR Norway, 6 UNIFI Italy, 7 DLR/IPA Germany, 8 KNMI Netherlands, 9 IAP/Kuhlungsborn Germany, 10 ALOMAR Norway, 11 IRF Sweden, 12 NTNU Norway, 13 IAP/Prague
Czech Republic, 14 CEA subcontracting France, 15 Univ Reunion France, 16 IAP/Bern Switzerland, 17 TAU Israel, 18 NUIM Ireland, 19 IMO Island, 20 IOGA Madagascar, 21 NIEP Romania, 22 FGF Portugal, 23 CNCT Tunisia, 24 LAMTO Ivory Coast1
CEA France, 2 BGR Germany, 3 CNRS France, 4 UREAD United Kingdom, 5 NORSAR Norway, 6 UNIFI Italy, 7 DLR/IPA Germany, 8 KNMI Netherlands, 9 IAP/Kuhlungsborn Germany, 10 ALOMAR Norway, 11 IRF Sweden, 12 NTNU Norway, 13 IAP/Prague
Czech Republic, 14 CEA subcontracting France, 15 Univ Reunion France, 16 IAP/Bern Switzerland, 17 TAU Israel, 18 NUIM Ireland, 19 IMO Island, 20 IOGA Madagascar, 21 NIEP Romania, 22 FGF Portugal, 23 CNCT Tunisia, 24 LAMTO Ivory Coast
There is currently a lack of observations, data and model parameters, which are needed in weather and climate models. ARISE
is an EU-funded infrastructure project (FP7 2012-2014 and H2020 2015-2018) with a long-term objective to fill this gap andsolve persistent problems facing the applications which depend on atmospheric dynamics. The atmosphere is a dynamic medium
being continuously disturbed by winds and atmospheric waves over a broad range of time and spatial scales. Disturbances include
large-scale waves such as gravity and planetary waves which transfer energy and momentum from one region of the atmosphereto another. Atmospheric extreme events such as volcanoes, stratospheric warming events, magnetic storms, tornadoes and tropical thunderstorms also constitute significant disturbances to atmospheric dynamics.
The ARISE project aims at establishing a unique atmospheric research and data platform in Europe and outlying regions,
including the polar and equatorial regions. It will combine observations with theoretical and modelling studies to elucidate thedynamics of the middle and upper atmosphere. For the first time, several technologies (infrasound, lidar, airglow, radars, ionospheric observations and satellites) will be used simultaneously and in a complementary way. The measurements will be used to
improve the parameterization of gravity waves in the stratosphere to better resolve climate models. Such description is crucial
to estimate the impact of stratospheric climate forcing on the troposphere. The collected data are required to improve weather
forecasting to monthly or seasonal scales, remote volcano monitoring, climate monitoring and other applications. The ARISE
data portal aims to provide high-quality, easy-to-use data and advanced data products to a wide scientific community.
キーワード: atmospheric dynamics, infrasound, gravity waves, planetary waves, weather forecasting, climate monitoring
Keywords: atmospheric dynamics, infrasound, gravity waves, planetary waves, weather forecasting, climate monitoring

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