The characteristic response of whistler mode waves to interplanetary shocks

TitleThe characteristic response of whistler mode waves to interplanetary shocks
Publication TypeJournal Article
Year of Publication2017
AuthorsYue, C, Chen, L, Bortnik, J, Ma, Q, Thorne, RM, Angelopoulos, V, Li, J, An, X, Zhou, C, Kletzing, C, Reeves, GD, Spence, HE
JournalJournal of Geophysical Research: Space Physics
Date Published09/2017
KeywordsIP shocks; MLT dependent; Plasmaspheric Hiss; Ray Tracing; Van Allen Probes; whistler mode chorus
AbstractMagnetospheric whistler mode waves play a key role in regulating the dynamics of the electron radiation belts. Recent satellite observations indicate a significant influence of interplanetary (IP) shocks on whistler mode wave power in the inner magnetosphere. In this study, we statistically investigate the response of whistler mode chorus and plasmaspheric hiss to IP shocks based on Van Allen Probes and THEMIS satellite observations. Immediately after the IP shock arrival, chorus wave power is usually intensified, often at post-midnight to pre-noon sector, while plasmaspheric hiss wave power predominantly decreases near the dayside but intensifies near the nightside. We conclude that chorus wave intensification outside the plasmasphere is probably associated with the suprathermal electron flux enhancement caused by the IP shock. Through a simple ray tracing modeling assuming the scenario that plasmaspheric hiss is originated from chorus, we find that the solar wind dynamic pressure increase changes the magnetic field configuration to favor ray penetration in the nightside and promote ray refraction away from the dayside, potentially explaining the magnetic local time (MLT) dependent responses of plasmaspheric hiss waves following IP shock arrivals.
URLhttp://onlinelibrary.wiley.com/doi/10.1002/2017JA024574/full
DOI10.1002/2017JA024574
Short TitleJ. Geophys. Res. Space Physics


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