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2018

The Effect of Hot Protons on Magnetosonic Waves Inside and Outside the Plasmapause: New Observations and Theoretic Results

Based on the wave and proton observations by Van Allen Probes A and B, we examined the effects of hot protons (0.01\textendash50 keV) on fast magnetosonic (MS) waves inside and outside the Earth\textquoterights plasmasphere. In the low-density plasma trough outside the plasmapause, the gyroresonance interactions between hot protons and MS waves not only cause the MS wave growth at some frequencies but also lead to the damping of MS waves at other frequencies, which depends on the proton phase space density gradient and the ambient plasma density. The gyroresonance of the observed hot protons cannot excite MS waves near the lower hybrid resonance frequency and even causes the MS wave damping. Thus, the frequencies of the observed MS waves outside the plasmapause are usually lower than the lower hybrid resonance frequency. In the high-density plasmasphere, the observed hot protons merely lead to the weak gyrodamping of MS waves. The persistent existence of lower band MS waves indicates that the weak gyrodamping effect of hot protons on MS waves is ignorable in the high-density plasmasphere.

Liu, Bin; Li, Liuyuan; Yu, Jiang; Cao, Jinbin;

Published by: Journal of Geophysical Research: Space Physics      Published on: 01/2018

YEAR: 2018     DOI: 10.1002/2017JA024676

damping of magnetosonic waves; growth of magnetosonic waves; magnetosonic waves; magnetospheric hot protons; Van Allen Probes; wave-particle interactions



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