資料9-GCommission G Report
September 25, 2017
1. Meeting announcement/report•The 18th EISCAT symposium (EISCAT18) was held from 26th to 30th May 2017 at National
Institute of Polar Research (NIPR), Tokyo, Japan, in connection with the 15th MST(Mesosphere/Stratosphere/Troposphere) radar workshop (MST15). Two meetings shared thevenue and part of sessions are conducted together. Total participants in workshop and symposium
were 182 (62 in-Japan participants from 18 Japanese institutes and 120 foreign participants from67 foreign institutes in 18 countries.). In total, we had 146 oral presentation (including 31 invitedpresentation) and 87 posters. This was the largest meeting for both EISCAT18 and MST15. We
will publish papers from the meeting as Earth, Planets and Space (EPS) journal special issue.
http://eiscat.nipr.ac.jp/about/18th_eiscat_symposium.html
http://www2.rish.kyoto-u.ac.jp/mst15/index.html•Joint IAPSO-IAMAS-IAGA Assembly was held in Cape Town, South Africa. The Joint Assembly,
endorsed by the University of Cape Town and the South African Department of Science andTechnology, took place from 27 August to 1 September 2017 at the Cape Town InternationalConvention Centre (CTICC).
http://iapso-iamas-iaga2017.com/index.php•

MU radar /Equatorial Atmosphere Radar Symposium was held at RISH, Kyoto University on
September 7-8, 2017. This is the annual meeting for the cooperative use of the facilities.
Commission G of Japanese URSI co-sponsors this symposium.

2. Topics
2.1. Masterplan 2017
Research Institute for Sustainable Humanosphere (RISH), Kyoto University, National Institute of Polar
Research (NIPR), Institute for Space-Earth Environmental Research (ISEE), Nagoya University, andInternational Center for Space Weather Science and Education (ICSWSE), Kyushu University proposed
the research project “Coupling process in the solar-terrestrial system” (PI: Prof. Toshitaka Tsuda at RISH,Tsuda et al. [2016]) to Masterplan 2017 of Science Council of Japan (SCJ). This project is to establish
Equatorial MU (EMU) radar in Sumatera Island, Indonesia, EISCAT_3D radar in northern Scandinavia
under international collaborations, global observation network of geomagnetic field and airglow imagers.
In February 2017, our plan was successfully approved as one of 28 important large research projects. We
further proposed this project to Roadmap 2017 of the Ministry of Education, Culture, Sports, Science andTechnology (MEXT) in April, but unfortunately fail to be approved on the list. We will continue pursue
success of this project.
Announcement Masterplan 2017 by SCJ http://www.scj.go.jp/ja/info/kohyo/kohyo-23-t241-1.html

3. Research Report
3.1. Report from National Institute for Polar Research (NIPR)(Yasunobu Ogawa, NIPR)=== Research activity related to PANSY ===JpGU-AGU Joint Meeting 2017 Session A-AS10 "Interhemispheric and intrahemispheric coupling of
the atmosphere"
http://www.jpgu.org/meeting_2017/session_list/detail/A-AS10.html=== Recent papers related to PANSY ===Shibuya, R., K. Sato, M. Tsutsumi, T. Sato, Y. Tomikawa, K. Nishimura, and M. Kohma, Quasi-12 hinertia–gravity waves in the lower mesosphere observed by the PANSY radar at Syowa Station

1

資料9-G(39.6° E, 69.0° S), Atmos. Chem. Phys., 17, 6455-6476, https://doi.org/10.5194/acp-17-6455-2017,2017.
Tsutsumi, M., K. Sato, T. Sato, M. Kohma, T. Nakamura, K. Nishimura, and Y. Tomikawa,
Characteristics of mesosphere echoes over Antarctica obtained using PANSY and MF radars, SOLA,
13A, in press, 2017.
Hashimoto, T., K. Nishimura, M. Tsutsumi, K. Sato and T. Sato, A user parameter-free diagonalloading scheme for clutter rejection on radar wind profilers, J. Atmos. Oceanic Technol., 34, 11391153. doi:10.1175/JTECH-D-16-0058.1, 2017.

=== Research activity related to EISCAT ===Start of EISCAT_3D project was decided in May 2017. The opening event for the construction of thefirst stage of the EISCAT_3D system took place in Tromsø, Norway on 7 September 2017.
https://eiscat3d.se/content/eiscat3d-opening-event=== Recent papers related to EISCAT ===Adachi, K., S. Nozawa, Y. Ogawa, A. Brekke, . M. Hall, and R. Fujii, Evaluation of a method toderive ionospheric conductivities using two auroral emissions (428 and 630 nm) measured with aphotometer at Tromsoe (69.6°N), Earth, Planets and Space EPSP-D-16-00217, in press, 2017.
Yamazaki, Y., M. J. Kosch, and Y. Ogawa, Average field-aligned ion velocity over the EISCAT
radars, J. Geophys. Res., DOI: 10.1002/2017JA023974, May, 2017.

3.2. Report from Institute for Space-Earth Environmental Research (ISEE), Nagoya University(Satonori Nozawa, Nagoya University)=== Research topics ===Tan et al. (2017) showed density variability of nighttime D-region ionosphere using reflection heightof tweek atmospherics recorded at Vietnam and Japan. Yonezu et al. (2017) reported simultaneous
observations of magnetospheric ELF/VLF emissions in Canada, Finland, and Antarctica, based on 48
days of data, and showed how the simultaneous occurrence rate of chorus/hiss emissions decreases as
the local time separation increases.
== Recent papers ===Tan, L. M., K Shiokawa, N. N. Thu and T. Q. Ha, Density variability of nighttime D-region
ionosphere in Vietnamese and Japanese sectors, J. Geophys. Res., 122, doi:
10.0002/2017JA024025, 2017.
Yonezu, Y., K. Shiokawa, M. Connors, M. Ozaki, J. K Manninen, H. Yamagishi, and M. Okada,
Simultaneous observations of magnetospheric ELF/VLF emissions in Canada, Finland, andAntarctica, J. Geophys. Res., 122, doi: 10.0002/2017JA024211, 2017.
3.3. Report from National Institute for Information and Communications Technology (NICT)(Minoru Kubota, NICT)=== Recent papers===

Chen, G., H. Jin, J. Yan, S. Zhang, G. Li,T. Yokoyama, G. Yang, C. Yan, C. Wu, J. Wang, D.
Zhong, Y. Li, and Z. Wang, Low-latitude daytime F-region irregularities observed in twogeomagnetically quiet days by the Hainan coherent scatter phased array radar (HCOPAR), J.
Geophys. Res. Space Physics, 122, 2645-2654, doi:10.1002/2016JA023202, 2017.
Fukushima, D., K. Shiokawa, Y. Otsuka, M. Kubota, T. Yokoyama, M. Nishioka, S. Komonjinda,
and C. Y. Yatini, Geomagnetically conjugate observations of ionospheric and thermosphericvariations accompanied by a midnight brightness wave at low latitudes, Earth Planets Space, 69,112, doi:10.1186/s40623-017-0698-z, 2017.
2

資料9-G

Jamjareegulgarn, P., P. Supnithi, K. Watthanasangmechai, T. Yokoyama, T. Tsugawa, and M.
Ishii, A new expression for computing the bottomside thickness parameter and comparisons withthe NeQuick and IRI-2012 models during declining phase of solar cycle 23 at equatorial latitude
station, Chumphon, Thailand, Adv. Space Res., 60,329-346, doi:10.1016/j.asr.2016.11.003, 2017.
Jiang, C., G. Yang, J. Liu, T. Yokoyama, T. Liu, T. Lan, C. Zhou, Y. Zhang, Z. Zhao, T.
Komolmis, P. supnithi, and C. Y. Yatini, Equatorial and low-latitude ionospheric response to the
17-18 March 2015 great storm over South East Asia longitude sector, J. Geophys. Res. Space
Physics, 122,5756-5767, doi:10.1002/2017JA024134, 2017.
Maruyama, T., Guanyi Ma, Takuya Tsugawa, Pornchai Supnithi and Tharadol Komolmis,
Ionospheric peak height at the magnetic equator: Comparison between ionosonde measurements
and IRI, Advances in Space Research, Vol.60(2), 375-380, doi:10.1016/j.asr.2016.10.013, 15 July2017.
M Buhari, S., M. Abdullah, T. Yokoyama, Y. Otsuka, M. Nishioka, A. Hasbi, S. A. Bahari, and T.
Tsugawa, Climatology of successive equatorial plasma bubbles observed by GPS ROTI overMalaysia, J. Geophys. Res. Space Physics, 122, 2174-2184, doi:10.1002/2016JA023202, 2017.
Tao, C., H. Jin, H. Shinagawa, H. Fujiwara, and Y. Miyoshi, Effect of intrinsic magnetic field
decrease on the low- to middle-latitude upper atmosphere dynamics simulated by GAIA, J.
Geophys. Res. Space Physics, doi:10.1002/2017JA024278, 2017.
Yokoyama, T., and C. Stolle, Low and midlatitude ionospheric plasma density irregularities andtheir effects on geomagnetic field, Space Sci. Rev., 206, 495-519, doi:10.1007/s11214-016-02957, 2017.
3.4. Report from Kyushu University(Huixin Liu, Kyushu University)=== Recent papers===Liu H., N. Pedatella, K. Hocke, Medium-scale gravity wave perturbations in the bottomside F regionin tropical regions, Geophys. Res. Lett., 44, 7099-7105, doi: 10.1002/2017GL073855, 2017.
Liu H., J. Thayer, Y. Zhang, W. Lee, The non-storm time corrugated upper thermosphere: What's
beyond MSIS, Space Weather, 15, doi: 10.1002/2017SW001618, 2017.
Liu H., Y. Sun, Y. Miyoshi, H. Jin, ENSO effects on MLT diurnal tides: A 21 year reanalysis datadriven GAIA model simulation, J. Geophys. Res., 122, doi: 10.1002/2017JA024011, 2017.

3.5. Report from Electronic Navigation Research Institute (ENRI)(Susumu Saito, ENRI)=== Recent papers===Saito, S., and T. Yoshihara, Evaluation of extreme ionospheric total electron content gradientassociated with plasma bubbles for GNSS Ground-Based Augmentation System, Radio Science, 52,
doi:10.1002/2017RS006291, 2017.
Saito, S., S. Suzuki, M. Yamamoto, C. H. Chen, and A. Saito, Real-time ionosphere monitoring by
three-dimensional tomography over Japan, Journal of Institute of Navigation, in press, 2017.
Saito, S., S. Sunda, J. Lee, S. Pullen, S. Supriadi, T. Yoshihara, M. Terkildsen, F. Lecat, and ICAOAPANPIRG Ionospheric Studies Task Force, Ionospheric delay gradient model for GBAS in the AsiaPacific region, GPS Solutions, in press, 2017.

3.6. Report from Research Institute for Sustainable Humanosphere (RISH), Kyoto University(Mamoru Yamamoto, RISH)=== Recent papers===3

資料9-G

Tulasi Ram, S., K. K. Ajith, T. Yokoyama, M. Yamamoto, and K. Niranjan, Vertical rise velocity
of equatorial plasma bubbles estimated from Equatorial Atmosphere Radar (EAR) observationsand HIRB model simulations, J. Geophys. Res. Space Physics, 122, 6584-6594,
doi:10.1002/2017JA024260, 2017.
Dao, T., Y. Otsuka, K. Shiokawa, M. Nishioka, M. Yamamoto, S. M. Buhari, M. Abdullah, and A.
Husin (2017), Coordinated observations of postmidnight irregularities and thermospheric neutral
winds and temperatures at low latitudes, J. Geophys. Res. Space Physics, 122, 7504?7518,
doi:10.1002/2017JA024048.
Pavan Chaitanya, P., A. K. Patra, Y. Otsuka, T. Yokoyama, M. Yamamoto, R. A. Stoneback, and R. A.
Heelis (2017), Daytime zonal drifts in the ionospheric 150 km and E regions estimated using EAR
observations, J. Geophys. Res. Space Physics, 122, doi:10.1002/2017JA024589.

4