Prompt Disappearance and Emergence of Radiation Belt Magnetosonic Waves Induced by Solar Wind Dynamic Pressure Variations

TitlePrompt Disappearance and Emergence of Radiation Belt Magnetosonic Waves Induced by Solar Wind Dynamic Pressure Variations
Publication TypeJournal Article
Year of Publication2018
AuthorsLiu, N, Su, Z, Zheng, H, Wang, Y, Wang, S
JournalGeophysical Research Letters
Date Published01/2018
Keywordsmagnetosonic waves; Radiation belt; ring current; solar wind dynamic pressure; Van Allen Probes; wave-particle interaction
AbstractMagnetosonic waves are highly oblique whistler mode emissions transferring energy from the ring current protons to the radiation belt electrons in the inner magnetosphere. Here we present the first report of prompt disappearance and emergence of magnetosonic waves induced by the solar wind dynamic pressure variations. The solar wind dynamic pressure reduction caused the magnetosphere expansion, adiabatically decelerated the ring current protons for the Bernstein mode instability, and produced the prompt disappearance of magnetosonic waves. On the contrary, because of the adiabatic acceleration of the ring current protons by the solar wind dynamic pressure enhancement, magnetosonic waves emerged suddenly. In the absence of impulsive injections of hot protons, magnetosonic waves were observable even only during the time period with the enhanced solar wind dynamic pressure. Our results demonstrate that the solar wind dynamic pressure is an essential parameter for modeling of magnetosonic waves and their effect on the radiation belt electrons.
URLhttp://onlinelibrary.wiley.com/doi/10.1002/2017GL076382/full
DOI10.1002/2017GL076382
Short TitleGeophys. Res. Lett.


Page Last Modified: February 1, 2018