Van Allen Probes observations of direct wave‐particle interactions

J. F Fennell; J. L Roeder; W. S Kurth; M. G Henderson; B. A Larsen; G Hospodarsky; J. R Wygant; J. S. G Claudepierre; J. B Blake; H. E Spence; J. H Clemmons; H. O Funsten; C. A Kletzing; G. D Reeves

doi:10.1002/2013GL059165

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Van Allen Probes observations of direct wave‐particle interactions

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Van Allen Probes observations of direct wave‐particle interactions

J. F Fennell, J. L Roeder, W. S Kurth, M. G Henderson, B. A Larsen, G Hospodarsky, J. R Wygant, J. S. G Claudepierre, J. B Blake, H. E Spence, …

Geophysical research letters, Vol.41(6), pp.1869-1875

03/28/2014

DOI: 10.1002/2013GL059165

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Abstract

Quasiperiodic increases, or “bursts,” of 17–26 keV electron fluxes in conjunction with chorus wave bursts were observed following a plasma injection on 13 January 2013. The pitch angle distributions changed during the burst events, evolving from sinN(α) to distributions that formed maxima at α = 75–80°, while fluxes at 90° and <60° remained nearly unchanged. The observations occurred outside of the plasmasphere in the postmidnight region and were observed by both Van Allen Probes. Density, cyclotron frequency, and pitch angle of the peak flux were used to estimate resonant electron energy. The result of ~15–35 keV is consistent with the energies of the electrons showing the flux enhancements and corresponds to electrons in and above the steep flux gradient that signals the presence of an Alfvén boundary in the plasma. The cause of the quasiperiodic nature (on the order of a few minutes) of the bursts is not understood at this time. Key Points Quasi‐periodic bursts of electrons and chorus waves are simultaneous Electron angular distributions change dramatically during the bursts Burst electron energies are consistent with wave resonance conditions

inner magnetosphere

Van Allen Probes

Wave Particle Interaction

Details

Title: Subtitle: Van Allen Probes observations of direct wave‐particle interactions
Creators: J. F Fennell - The Aerospace Corporation
J. L Roeder - The Aerospace Corporation
W. S Kurth - University of Iowa
M. G Henderson - Los Alamos National Laboratory
B. A Larsen - Los Alamos National Laboratory
G Hospodarsky - University of Iowa
J. R Wygant - University of Minnesota
J. S. G Claudepierre - The Aerospace Corporation
J. B Blake - The Aerospace Corporation
H. E Spence - University of New Hampshire
J. H Clemmons - The Aerospace Corporation
H. O Funsten - Los Alamos National Laboratory
C. A Kletzing - University of Iowa
G. D Reeves - Los Alamos National Laboratory
Resource Type: Journal article
Publication Details: Geophysical research letters, Vol.41(6), pp.1869-1875
DOI: 10.1002/2013GL059165
ISSN: 0094-8276
eISSN: 1944-8007
Number of pages: 7
Grant note: NASA (NNX10AK93G) Van Allen Probes ECT EMFISIS
Language: English
Date published: 03/28/2014
Academic Unit: Physics and Astronomy
Record Identifier: 9984199673702771

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