The Characteristic Response of Whistler Mode Waves to Interplanetary Shocks

Chao Yue; Lunjin Chen; Jacob Bortnik; Qianli Ma; Richard M Thorne; Vassilis Angelopoulos; Jinxing Li; Xin An; Chen Zhou; Craig Kletzing; Geoffrey D Reeves; Harlan E Spence

doi:10.1002/2017JA024574

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The Characteristic Response of Whistler Mode Waves to Interplanetary Shocks

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The Characteristic Response of Whistler Mode Waves to Interplanetary Shocks

Chao Yue, Lunjin Chen, Jacob Bortnik, Qianli Ma, Richard M Thorne, Vassilis Angelopoulos, Jinxing Li, Xin An, Chen Zhou, Craig Kletzing, …

Journal of geophysical research. Space physics, Vol.122(10), pp.10,047-10,057

10/2017

DOI: 10.1002/2017JA024574

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Abstract

Magnetospheric 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 postmidnight to prenoon 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‐dependent responses of plasmaspheric hiss waves following IP shock arrivals. Key Points We performed a statistical analysis of the whistler mode wave power response to IP shocks based on THEMIS and Van Allen Probes observations After the IP shock arrival, chorus wave power is usually intensified, which is associated with the suprathermal electron flux enhancement Plasmaspheric hiss wave power decreases near the dayside but intensifies near the nightside which may be due to B field topology change

IP shocks

MLT dependent

plasmaspheric hiss

ray tracing

whistler mode chorus

Details

Title: Subtitle: The Characteristic Response of Whistler Mode Waves to Interplanetary Shocks
Creators: Chao Yue - University Corporation for Atmospheric Research
Lunjin Chen - University of Texas at Dallas
Jacob Bortnik - University of California, Los Angeles
Qianli Ma - Boston University
Richard M Thorne - University of California, Los Angeles
Vassilis Angelopoulos - University of California, Los Angeles
Jinxing Li - University of California, Los Angeles
Xin An - University of California, Los Angeles
Chen Zhou - Wuhan University
Craig Kletzing - University of Iowa
Geoffrey D Reeves - Los Alamos National Laboratory
Harlan E Spence - University of New Hampshire
Resource Type: Journal article
Publication Details: Journal of geophysical research. Space physics, Vol.122(10), pp.10,047-10,057
DOI: 10.1002/2017JA024574
ISSN: 2169-9380
eISSN: 2169-9402
Number of pages: 11
Grant note: NASA Living With a Star Jack Eddy Postdoctoral Fellowship Program NSF (1405041) AFOSR (FA9550‐16‐1‐0344) NASA HTIDES (NNX16AG21G) NASA LWS (NNX13AI61G)
Language: English
Date published: 10/2017
Academic Unit: Physics and Astronomy
Record Identifier: 9984199958902771

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