SM032-0014
Isolated electrostatic potential structures correlated with low energy electron beams: Arase satellite observations
Monday, 14 December 2020
Poster
Tomoe Taki1, Hirotsugu Kojima2, Satoshi Kurita3, Yoichi Kazama4, Yoshiya Kasahara5, Iku Shinohara6, Yoshizumi Miyoshi7, Hideyuki Usui8, Shoya Matsuda9, S. Y. Wang4, Sunny W. Y. Tam10 and Ayako Matsuoka11, (1)Miyoshi City, AICHI PREFECTURE, Japan, (2)Kyoto University, Kyoto, Japan, (3)Kyoto University, Research Institute for Sustainable Humanosphere, Kyoto, Japan, (4)ASIAA, Taipei, Taiwan, (5)Kanazawa University, Kanazawa, Japan, (6)JAXA Japan Aerospace Exploration Agency, ISAS, Sagamihara, Japan, (7)ISEE, Nagoya University, Nagoya, Japan, (8)Kobe University, Kobe, Japan, (9)Nagoya University, Nagoya, Japan, (10)National Cheng Kung University, Tainan, Taiwan, (11)ISAS/JAXA, Sagamihara, Japan
Abstract:
In this paper, we discuss the physical properties of the isolated potential structure observed by the Arase satellite. A number of observations of isolated potential structures in space have been made via satellites such as VIKING, FAST, POLAR, GEOTAIL and RBSP. As a result, pulsed electric field waveforms have been observed, and the waveforms suggest the existence of a nonlinear process in the formation of isolated pulses. The Arase satellite presents a new observation of the isolated potential structures of the Earth's inner magnetosphere. The orbits of the Arase satellites are similar to those of the RBSP satellites, but the latitude range is different. Since the Arase satellite observes a wider latitudinal range than the RBSP satellite, it is worthwhile to compare the observations of the two satellites.
The Arase satellite observed a broadband electric field spectrum that correlates with the low-energy electron beam. As a result of the waveform observation by the Arase PWE, observed broadband electric field spectra consisting of isolated pulsed waveforms are electrostatic and similar to those observed by RBSP. Assuming that the spatially isolated electrostatic potential structure has a velocity relative to the satellite, these waveforms are likely to be observations of the potential structures. The coincidence of the isolated potential structure with the observations of the low-energy electron beam has implications for the discussion of the physical nature of the isolated potential structure.
We also categorized the waveforms of the isolated electric fields observed by the Arase satellite. As a result, it was found that the direction of the electric field in the isolated waveform observed by the Arase satellite is different from that observed by the RBSP satellite. In this paper, we also discuss the differences in the physical properties of the isolated waveforms observed by the Arase and RBSP satellites.
