Ion cyclotron waves observed near the plasmapause |
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| Institution: | 1. Institute of Geophysics and Planetary Physics, UCLA, CA 90024, U.S.A.;2. Physics Department, University of Newcastle, NSW 2308, Australia;3. Department of Physics, University of Alberta, Edmonton, Canada T6G 2J1, U.S.A.;4. Department of Earth and Space Sciences, UCLA, CA 90024, U.S.A.;1. MNR Key Laboratory for Polar Science, Polar Research Institute of China, Shanghai, China;2. State Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing, China;3. National Institute of Polar Research, Tokyo, Japan;4. Department of Polar Science, The Graduate University for Advanced Studies, SOKENDAI, Hayama, Japan;1. Institute of Geophysics, University of Tehran, Iran;2. Independent Researcher, Lancaster, UK;3. Department of Physics, Lancaster University, Lancaster, UK;4. South African National Space Agency (SANSA), Hermanus, South Africa;5. Dept. of Physics and Astronomy, University of the Western Cape, Bellville, South Africa;6. Bradley Department of Electrical and Computer Engineering, Virginia Tech, USA;7. EISCAT Scientific Association, Ramfjordmoen, Norway;8. Department of Electrical and Computer Engineering, Interamerican University of Puerto Rico, PR, USA |
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| Abstract: | Pc2 electromagnetic ion cyclotron waves at 0.1 Hz, near the oxygen cyclotron frequency, have been observed by ISEE-1 and -2 between L = 7.6 − 5.8 on an inbound near equatorial pass in the dusk sector. The waves occurred in a thick plasmapause of width ⋍ 1 Re and penetrated ⋍ 1 Re into the plasmasphere. Wave onset was accompanied by significant increases in the thermal (0–100 eV) He+ and the warm (0.1–16 keV/e) O+ and He+ heavy ion populations. Wave polarization is predominantly left-handed with propagation almost parallel to the ambient magnetic field, and the spectral slot and polarization reversal predicted by multicomponent cold plasma propagation theory are identified in the wave data. The results are considered an example of wave-particle interactions occurring during the outer plasmasphere refilling process at the time of the substorm recovery phase. |
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