First evidence for chorus at a large geocentric distance as a source of plasmaspheric hiss: Coordinated THEMIS and Van Allen Probes observation

W Li; C. A Kletzing; L Chen; W. S Kurth; J Bortnik; G. B Hospodarsky; R. M Thorne; V Angelopoulos

doi:10.1002/2014GL062832

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First evidence for chorus at a large geocentric distance as a source of plasmaspheric hiss: Coordinated THEMIS and Van Allen Probes observation

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First evidence for chorus at a large geocentric distance as a source of plasmaspheric hiss: Coordinated THEMIS and Van Allen Probes observation

W Li, C. A Kletzing, L Chen, W. S Kurth, J Bortnik, G. B Hospodarsky, R. M Thorne and V Angelopoulos

Geophysical research letters, Vol.42(2), pp.241-248

01/28/2015

DOI: 10.1002/2014GL062832

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Abstract

Recent ray tracing suggests that plasmaspheric hiss can originate from chorus observed outside of the plasmapause. Although a few individual events have been reported to support this mechanism, the number of reported conjugate events is still very limited. Using coordinated observations between Time History of Events and Macroscale Interactions during Substorms (THEMIS) and Van Allen Probes, we report on an interesting event, where chorus was observed at a large L shell (~9.8), different from previously reported events at L < 6, but still exhibited a remarkable correlation with hiss observed in the outer plasmasphere (L ~ 5.5). Ray tracing indicates that a subset of chorus can propagate into the observed location of hiss on a timescale of ~5–6 s, in excellent agreement with the observed time lag between chorus and hiss. This provides quantitative support that chorus from large L shells, where it was previously considered unable to propagate into the plasmasphere, can in fact be the source of hiss. Key Points Chorus excited at large L can propagate into the plasmasphere and form hiss Conjugate observation shows excellent correlation between chorus and hiss Propagation time from source region of chorus to hiss agrees with observation

chorus

hiss

wave propagation

Details

Title: Subtitle: First evidence for chorus at a large geocentric distance as a source of plasmaspheric hiss: Coordinated THEMIS and Van Allen Probes observation
Creators: W Li - University of California, Los Angeles
C. A Kletzing - University of Iowa
L Chen - University of Texas at Dallas
W. S Kurth - University of Iowa
J Bortnik - University of California, Los Angeles
G. B Hospodarsky - University of Iowa
R. M Thorne - University of California, Los Angeles
V Angelopoulos - University of California, Los Angeles
Resource Type: Journal article
Publication Details: Geophysical research letters, Vol.42(2), pp.241-248
DOI: 10.1002/2014GL062832
ISSN: 0094-8276
eISSN: 1944-8007
Number of pages: 8
Grant note: NASA (NAS5‐01072; NNX11AD75G; NNX11AR64G; NNX13AI61G) NSF NASA EMFISIS (1001057397:01) JHU/APL (967399; 921647) NSF (AGS 1405054; AGS 1405041) ECT (13‐041)
Language: English
Date published: 01/28/2015
Academic Unit: Physics and Astronomy
Record Identifier: 9984199853902771

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