An unusual enhancement of low‐frequency plasmaspheric hiss in the outer plasmasphere associated with substorm‐injected electrons

W Li; R. M Thorne; J Bortnik; G. D Reeves; C. A Kletzing; W. S Kurth; G. B Hospodarsky; H. E Spence; J. B Blake; J. F Fennell; S. G Claudepierre; J. R Wygant; S. A Thaller

doi:10.1002/grl.50787

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An unusual enhancement of low‐frequency plasmaspheric hiss in the outer plasmasphere associated with substorm‐injected electrons

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An unusual enhancement of low‐frequency plasmaspheric hiss in the outer plasmasphere associated with substorm‐injected electrons

W Li, R. M Thorne, J Bortnik, G. D Reeves, C. A Kletzing, W. S Kurth, G. B Hospodarsky, H. E Spence, J. B Blake, J. F Fennell, …

Geophysical research letters, Vol.40(15), pp.3798-3803

08/16/2013

DOI: 10.1002/grl.50787

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Abstract

Both plasmaspheric hiss and chorus waves were observed simultaneously by the two Van Allen Probes in association with substorm‐injected energetic electrons. Probe A, located inside the plasmasphere in the postdawn sector, observed intense plasmaspheric hiss, whereas Probe B observed chorus waves outside the plasmasphere just before dawn. Dispersed injections of energetic electrons were observed in the dayside outer plasmasphere associated with significant intensification of plasmaspheric hiss at frequencies down to ~20 Hz, much lower than typical hiss wave frequencies of 100–2000 Hz. In the outer plasmasphere, the upper energy of injected electrons agrees well with the minimum cyclotron resonant energy calculated for the lower cutoff frequency of the observed hiss, and computed convective linear growth rates indicate instability at the observed low frequencies. This suggests that the unusual low‐frequency plasmaspheric hiss is likely to be amplified in the outer plasmasphere due to the injected energetic electrons. Key Points An unusual low‐frequency hiss was observed in the dayside outer plasmaphere This hiss amplification is related to injected energetic electrons Electron distributions are unstable for the observed wave frequencies

chorus excitation

hiss amplification

substorm injection

Details

Title: Subtitle: An unusual enhancement of low‐frequency plasmaspheric hiss in the outer plasmasphere associated with substorm‐injected electrons
Creators: W Li - University of California, Los Angeles
R. M Thorne - University of California, Los Angeles
J Bortnik - University of California, Los Angeles
G. D Reeves - Los Alamos National Laboratory
C. A Kletzing - University of Iowa
W. S Kurth - University of Iowa
G. B Hospodarsky - University of Iowa
H. E Spence - University of New Hampshire
J. B Blake - The Aerospace Corporation
J. F Fennell - The Aerospace Corporation
S. G Claudepierre - The Aerospace Corporation
J. R Wygant - University of Minnesota
S. A Thaller - University of Minnesota
Resource Type: Journal article
Publication Details: Geophysical research letters, Vol.40(15), pp.3798-3803
DOI: 10.1002/grl.50787
ISSN: 0094-8276
eISSN: 1944-8007
Number of pages: 6
Language: English
Date published: 08/16/2013
Academic Unit: Physics and Astronomy
Record Identifier: 9984200053102771

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