Japan Geoscience Union Meeting 2015

Presentation information


Symbol P (Space and Planetary Sciences) » P-CG Complex & General

[P-CG31] Status and perspective of future missions and their instruments and technologies for space sciences

Wed. May 27, 2015 6:15 PM - 7:30 PM Convention Hall (2F)

Convener:*Masafumi Hirahara(Solar-Terrestrial Environment Laboratory, Nagoya University), Hirotsugu Kojima(Research institute for sustainable humanosphere, Kyoto University), Yukihiro Takahashi(Department of Cosmosciences, Graduate School of Science, Hokkaido University), Makoto Suzuki(Institute for Space and Astronautical Sciences, Japan Aerospace Exploration Agency)

6:15 PM - 7:30 PM

[PCG31-P02] Development of electric field instrument onboard spacecraft

*Keigo ISHISAKA1, Hirotsugu KOJIMA2, Yasumasa KASABA3, Takumi ABE4 (1.Toyama Prefectural University, 2.RISH, Kyoto University, 3.Tohoku University, 4.ISAS)

Keywords:electric field instrument, electric field sensor, antenna, sounding rocket, small satellite

Measurements of electric fields are one of key elements for various missions. The detection of electric field is useful to identify global plasma dynamics and energetic processes in magnetosphere and ionosphere. The concrete examples are as follows.
- Electric field structure associated with the charged particle precipitation
- Electric field structure associated with the global motion of the ionosphere
- The role of the electric field in the acceleration and heating mechanisms of ions
- Propagation mechanism of the electric field in the auroral ionosphere to the low latitude ionosphere
- Electric field structure in the equatorial ionosphere
Many electric field measurements have been carried out in Japan. And the electric field detector onboard sounding rockets and satellites have been successfully used in the D, E and F regions of the ionosphere and in the magnetosphere.
The double probe technique have been extensively used on sounding rockets in order to measure electric field in the ionosphere. And the passive double probe technique has been proven to be a reliable technique in the high electron density plasmas of the ionosphere. The technique has been extended to the lower density plasmas of the D region of the ionosphere. For electric field measurement, a wire antenna has been used as a sensitive sensor onboard Japanese sounding rocket. And this antenna will be used for several spacecraft in the future mission. However, its extension mechanism is complicated and it is difficult for the sounding rocket to extend a wire antenna in the ionosphere. Accordingly new type antennas are developed in order to measure the electric field by the sounding rocket. Their antennas fulfill the severe requirements to the antenna system, i.e., light mass, enough stiffness, compact storage, safe extension, and reasonable test efforts. Three antennas were newly developed for the electric field measurement. These antennas were loaded on three sounding rocket in Japan (S-310-37, S-520-23, S-520-26). And these new style antennas deployed normally during the flight of a sounding rocket, and succeeded in the electric field observation in the ionosphere.
This paper describes about the basic measurement techniques of the electric field in the ionosphere. In particular it explains about three new type antennas in detail. Then we show the electric field in the ionosphere measured by the new type antenna onboard the Japanese sounding rocket.