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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한국우주과학회 Journal of Astronomy and Space Sciences Journal of Astronomy and Space Sciences 제37권 제2호
- 발행연도
- 2020.1
- 수록면
- 85 - 94 (10page)
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초록· 키워드
오류제보하기
Equatorial noise, also known magnetosonic waves (MSWs), are one of the frequently observed plasma waves in Earth’s inner magnetosphere. Observations have shown that wave amplitudes maximize at the magnetic equator with a narrow extent in their latitudinal distribution. It has been understood that waves are generated from an equatorial source region and confined within a few degrees magnetic latitude. The present study investigates whether the MSW instability and saturation amplitudes maximize at the equator, given an energetic proton ring-like distribution derived from an observed wave event, and using linear instability analysis and particle-in-cell simulations with the plasma conditions at different latitudes along the dipole magnetic field line. The results show that waves initially grow fastest (i.e., with the largest growth rate) at high latitude (20°–25°), but consistent with observations, their saturation amplitudes maximize within ±10° latitude. On the other hand, the slope of the saturation amplitudes versus latitude revealed in the present study is not as steep as what the previous statistical observation results suggest. This may be indicative of some other factors not considered in the present analyses at play, such as background magnetic field and plasma inhomogeneities and the propagation effect.
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참고문헌 (49)
참고문헌 신청
R. André / 2002 / A first approach to model the low-frequency wave activity in the plasmasphere / Annales Geophysicae 20(7):981~996
Arfken GB / 1985 / Mathematical Methods for Physicists / Academic Press
Michael A. Balikhin / 2015 / Observations of discrete harmonics emerging from equatorial noise / Nature Communications 6(1):7703
S. A. Boardsen / 1992 / Funnel-shaped, low-frequency equatorial waves / Journal of Geophysical Research 97(A10):14967~14976
Scott A. Boardsen / 2016 / Survey of the frequency dependent latitudinal distribution of the fast magnetosonic wave mode from Van Allen Probes Electric and Magnetic Field Instrument and Integrated Science waveform receiver plasma wave analysis / Journal of Geophysical Research: Space Physics 121(4):2902~2921
Arfken GB / 1985 / Mathematical Methods for Physicists / Academic Press
Michael A. Balikhin / 2015 / Observations of discrete harmonics emerging from equatorial noise / Nature Communications 6(1):7703
S. A. Boardsen / 1992 / Funnel-shaped, low-frequency equatorial waves / Journal of Geophysical Research 97(A10):14967~14976
Scott A. Boardsen / 2016 / Survey of the frequency dependent latitudinal distribution of the fast magnetosonic wave mode from Van Allen Probes Electric and Magnetic Field Instrument and Integrated Science waveform receiver plasma wave analysis / Journal of Geophysical Research: Space Physics 121(4):2902~2921
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