Excitation of nightside magnetosonic waves observed by Van Allen Probes

Qinghua Zhou; C. A Kletzing; Fuliang Xiao; W. S Kurth; Chang Yang; G. B Hospodarsky; Si Liu; D. N Baker; H. E Spence; G. D Reeves; H. O Funsten; J. B Blake; J. R Wygant

doi:10.1002/2014JA020481

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Excitation of nightside magnetosonic waves observed by Van Allen Probes

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Excitation of nightside magnetosonic waves observed by Van Allen Probes

Qinghua Zhou, C. A Kletzing, Fuliang Xiao, W. S Kurth, Chang Yang, G. B Hospodarsky, Si Liu, D. N Baker, H. E Spence, G. D Reeves, …

Journal of geophysical research. Space physics, Vol.119(11), pp.9125-9133

11/2014

DOI: 10.1002/2014JA020481

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https://scholars.unh.edu/cgi/viewcontent.cgi?article=1332&context=physics_facpubView

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Abstract

During the recovery phase of the geomagnetic storm on 30–31 March 2013, Van Allen Probe A detected enhanced magnetosonic (MS) waves in a broad range of L = 1.8–4.7 and magnetic local time (MLT) = 17–22 h, with a frequency range ∼10–100 Hz. In the meanwhile, distinct proton ring distributions with peaks at energies of ∼10 keV, were also observed in L = 3.2–4.6 and L = 5.0–5.6. Using a subtracted bi-Maxwellian distribution to model the observed proton ring distribution, we perform three-dimensional ray tracing to investigate the instability, propagation, and spatial distribution of MS waves. Numerical results show that nightside MS waves are produced by proton ring distribution and grow rapidly from the source location L = 5.6 to the location L = 5.0 but remain nearly stable at locations L < 5.0. Moreover, waves launched toward lower L shells with different initial azimuthal angles propagate across different MLT regions with divergent paths at first, then gradually turn back toward higher L shells and propagate across different MLT regions with convergent paths. The current results further reveal that MS waves are generated by a ring distribution of ∼10 keV proton and proton ring in one region can contribute to the MS wave power in another region.

magnetosonic wave

RBSP results

wave-particle interaction

Details

Title: Subtitle: Excitation of nightside magnetosonic waves observed by Van Allen Probes
Creators: Qinghua Zhou - Changsha University of Science and Technology
C. A Kletzing - University of Iowa
Fuliang Xiao - Changsha University of Science and Technology
W. S Kurth - University of Iowa
Chang Yang - Changsha University of Science and Technology
G. B Hospodarsky - University of Iowa
Si Liu - Changsha University of Science and Technology
D. N Baker - University of Colorado Boulder
H. E Spence - University of New Hampshire
G. D Reeves - Los Alamos National Laboratory
H. O Funsten - Los Alamos National Laboratory
J. B Blake - The Aerospace Corporation
J. R Wygant - University of Minnesota
Resource Type: Journal article
Publication Details: Journal of geophysical research. Space physics, Vol.119(11), pp.9125-9133
DOI: 10.1002/2014JA020481
ISSN: 2169-9380
eISSN: 2169-9402
Publisher: Blackwell Publishing Ltd
Number of pages: 9
Grant note: DOI: 10.13039/501100012166, name: 973 Program, award: 2012CB825603; DOI: 10.13039/501100001809, name: National Natural Science Foundation of China, award: 41204114, 41274165; name: JHU/APL, award: 921647, 967399; name: NASA Prime, award: NAS5-01072
Language: English
Date published: 11/2014
Academic Unit: Physics and Astronomy
Record Identifier: 9984199953302771

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