JIKIKEN electron beam measurements of the plasmapause |
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| Institution: | 1. The Institute of Space and Astronautical Science, 6-1, Komaba 4-chome, Meguro-ku, Tokyo, 153, Japan;2. National Laboratory for High Energy Physics, 1-1, Uehara, Ohomachi, Tsukuba-gun, Ibaragi-ken, Japan;1. School of Aeronautics and Astronautics, Sun Yat-sen University, Guangzhou, 510275, China;2. Department of Mechanical Engineering, York University, 4700 Keele Street, Toronto, Ontario M3J 1P3, Canada;1. Department of Physics, University of Lagos, Akoka, Lagos, Nigeria;2. B. K. M. Science College, Valsad, Gujarat, India |
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| Abstract: | An electron beam (200-eV, 0.25 – 1-mA) emitted fromJapanese magnetosphere exploring satellite JIKIKEN (EXOS-B) has excited a number of plasma waves. Among them, fUHF (upper hybrid frequency) and fp (plasma wave) are most strongly excited and from them, the plasma density and the magnetic field strength can be known. Moreover, when an electron beam is emitted, the spacecraft is charged up positively. When the ambient plasma density is low, the spacecraft is charged up to the beam energy and most of electrons emitted return to the spacecraft. This is another plasma parameter indication in the magnetosphere. These two characteristics that is, the wave excitation and the spacecraft charge-up by the electron beam emission in space are used as very powerful tools for the diagnostics of plasma in the magnetosphere. |
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