資料6-H

Japanese URSI Commission H (Waves in Plasmas)
Activity Report
June 2016 - October 2016[1] Status of projects related with plasma wave observation
1.

BepiColombo/MMO
http://global.jaxa.jp/projects/sat/bepi/
http://www.stp.isas.jaxa.jp/mercury/p_mmo.html
BepiColombo is a Mercury exploration project jointly planned by JAXA and the European Space
Agency (ESA). It consists of two orbiters; the Mercury Planetary Orbiter (MPO) and the Mercury
Magnetosphere Orbiter (MMO). JAXA is responsible for development of the MMO.
MMO is at ESA/ESTEC (European Space Research and Technology Centre, Netherlands) fromApril 2015. For the plasma wave, Plasma Wave Investigation (PI: Y. Kasaba [Tohoku Univ.]) isaboard this spacecraft.
After the ESA manufacturing of MPO and Cruise units, the final FM test including the MMO
will be reactivated from January 2017. PWI Science Team is now shifting to prepare thetelemetry data pipelines and operation planning for the real science execution which will berealized in 2020s.
<Meeting> MMO Science Working Group Meeting (ISAS, Sep. 2016)

2.

JUICE
http://sci.esa.int/juice/JUICE (JUpiter ICy moons Explorer) is the L-class mission of ESA, planned for launch in 2022
and arrival at Jupiter in 2030s. It will spend at least three years making detailed observations ofthe Jovian system including Ganymede, Callisto and Europa, and finally be on the orbit around
Ganymede. For the plasma wave, Radio and Plasma Wave Investigation (PI: J.-E. Wahlund [IRFUppsala, Sweden]) is aboard this spacecraft and covers the information of the exospheres,surfaces, and conducting subsurface oceans of icy satellites and their interactions withsurrounding Jovian magnetosphere. From Japan, High Frequency part (Preamp and Receiver)
will be supplied (Co-PI: Y. Kasaba [Tohoku Univ.]), and provide the highly resolved informationof Jovian radiation emitted from Jupiter and Ganymede by the first 3-axis E-field measurement.
For the access to the conductive subsurface ocean, RPWI will first observe cold plasma andelectric fields, in order to separate the global conductivity and current from the ionospheres. Asa byproduct, reflected Jovian radio emission can be expected from the boundary of crust (ice)and subsurface ocean (conductive water).
From May 2016, Instrument Preliminary Development Review was executed. After this review,
RPWI EM2 (EM) will be developed.

3.

The ERG project
http://ergsc.stelab.nagoya-u.ac.jp/index.shtml.en
The ERG (Exploration of energization and Radiation in Geospace) project is a mission to study
acceleration and loss mechanisms of relativistic electrons around the Earth. To achievecomprehensive observations of plasma/particles, fields, and waves, the Plasma Wave Experiment(PWE, PI: Y. Kasahara [Kanazawa Univ.]) is installed onboard the ERG satellite to measureelectric field in the frequency range from DC to 10 MHz, and magnetic field in the frequency
range from a few Hz to 100 kHz. Besides the PWE, the Software-Wave Particle Interaction
Analyzer (SWPIA) (PI: H. Kojima, [Kyoto. Univ.]) is equipped onboard the ERG to realize direct
measurements of interactions between energetic electrons and whistler-mode chorus in the Earth's
inner magnetosphere.
Manufacturing and all function tests of the ERG satellite at Sagamihara campus in ISAS has
finished in September, and the satellite was shipped to the launch site at Uchinoura Space Center,
Kagoshima in the beginning of October, 2016.

資料6-H

4.

HpFP protocol
http://hpfp.nict.go.jp/
With the tremendous development of plasma wave observation technologies, large-scale data setsare collected from environmental detectors and sensors. We need a technology to transfer the dataon the networks. We have developed a novel data transfer protocol, namely HpFP (Highperformance and Flexible Protocol), that is designed on the top of UDP. The HpFP is compatible
with TCP, thus users are able to replace the TCP library with that of HpFP to get high throughput
on long fat networks (LFNs). For example, on the LFN with RTT 10msec and packet loss ratio
0.1%, TCP achieves less than 100 Mbps but HpFP more than 9 Gbps.

5.

Iceland - Syowa conjugate observation
A new VLF instrument has been installed at Husafell observatory in Iceland in
September, 2016. Unique conjugate observations of auroral phenomena including
the measurements of ULF and VLF waves have been carried out between Icelandand Syowa Station, Antarctica since 1983 by the National Institute of Polar
Research in Japan in collaboration with University of Iceland.

6.

Hisaki spacecraft
http://global.jaxa.jp/projects/sat/sprint_a/
Hisaki satellite with the EUV spectrometer (Extreme Ultraviolet Spectroscope for Exospheric
Dynamics: EXCEED) is the UV/EUV space telescope dedicated to planetary sciences.
Hisaki has provided continuous observations of Jovian system in UV aurora total flux and EUV
Io torus plasma distributions and plasma diagnostics, which connected the solar wind informationand ground-based radio (Decameter [aurora] - VHF [radiation belt]) and IR (aurora and airglows)
observations.

7.

GEOTAILGEOTAIL spacecraft has been operated since 1992. The Plasma Wave Instrument (PWI) is
continuously collecting the high resolution waveform data as well as the spectrum data. The color
plots of the observed wave spectrum data have been opened in the PWI web site
http://www.rish.kyoto-u.ac.jp/gtlpwi, and http://www.stp.isas.jaxa.jp/geotail. Furthermore, one
can easily also make the color spectrum plots in flexible time scales in the NICT web page
http://geotail.nict.go.jp/.

資料6-H[2] Recent Meetings
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The 18th International Congress on Plasma Physics (ICPP 2016), Taiwan, 27 June – 1 July, 2016
http://www.isaps.ncku.edu.tw/ICPP2016/
Asia Oceania Geosciences Society (AOGS) 13th Annual Meeting, Beijing, China, 31 July – 5Aug., 2016.
http://www.asiaoceania.org/aogs2016/
Sessions related to plasma waves:
ST11-28 ULF, ELF, and VLF waves and their effects on particles in the inner magnetosphere
Conveners:
Dr. Xin Tao (Univ. of Science & Technology of China, China) xtao@ustc.edu.cn
Dr. Yuto Katoh (Tohoku University, Japan) yuto@stpp.gp.tohoku.ac.jp
Prof. Lei Dai (Chinese Academy of Sciences, China) ldai@spaceweather.ac.cn
Prof. Kyung-Chan Kim (Daegu University, Korea, South) kckim@daegu.ac.kr
Dr. Masahito Nose (Kyoto University, Japan) nose@kugi.kyoto-u.ac.jp
7th workshop of the VLF/ELF Remote Sensing of Ionospheres and Magnetospheres (VERSIM)
working group, Hermanus, South Africa, 19-23 September, 2016.
Europa-Enceladus Plumes Workshop, Caltech, U.S.A., 15 October, 2016.
http://goo.gl/forms/hLSvt10pCe
48th Division of Planetary Sciences (DPS)/ 11th European Planetary Science
Congress (EPSC), Pasadena, U.S.A., 16-21 October, 2016.
https://aas.org/meetings/dps48Asia Oceania Space Weather Alliance (AOSWA) Workshop, Jeju, Korea, 24-27,October, 2016.
http://aoswa4.spaceweather.org/
Planetary radio emissions conference (PRE 8), Graz, Austria, 25-27 October, 2016.
http://pre8.oeaw.ac.at/
Europa-Enceladus Plumes Workshop, Caltech, U.S.A., 15 October, 2016.

[3] Future Meetings
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BepiColombo Hermean Environment Working Group Meeting & BepiColombo Science Working
Team Meeting, Tokyo, Japan, 7-10 November, 2016.
SGEPSS Fall Meeting, Fukuoka, Japan, 20-23 November, 2016.
http://www.icswse.kyushu-u.ac.jp/sgepss2016/
Symposium on Waves in Space Plasma (The 332nd Symposium in Sustainable Humanosphere),Uji, Kyoto, 2-3 December, 2016.
The symposium will be held in cooperation with Japanese URSI-H commission andsubcommittee on plasma wave in SGEPSS (Society of Geomagnetism and Earth, Planetary andSpace Sciences).
American Geophysical Union Fall Meeting, San Francisco, 12-16 December, 2016.
http://fallmeeting.agu.org/2016/
Symposium on Planetary Science 2017, Sendai, Japan, 20-22 February, 2017.
European Geosciences Union (EGU) General Assembly 2017, Vienna, Austria, 23-28 April, 2017.
http://www.egu2017.eu/
Japan Geoscience Union - American Geophysical Union Joint Meeting 2017, Chiba, Japan, 2025 May, 2016.
http://www.jpgu.org/meeting_e2016/