Near-source and Remote Observations of Kilometric Continuum Radiation from Multispacecraft Observations

J. D. Menietti; R. R. Anderson; J. S. Pickett; D. A. Gurnett; H. Matsumoto

doi:10.1029/2003JA009826

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Near-source and Remote Observations of Kilometric Continuum Radiation from Multispacecraft Observations

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Near-source and Remote Observations of Kilometric Continuum Radiation from Multispacecraft Observations

J. D. Menietti, R. R. Anderson, J. S. Pickett, D. A. Gurnett and H. Matsumoto

Journal of Geophysical Research, Vol.108(A11), pp.1393-n/a

11/2003

DOI: 10.1029/2003JA009826

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Abstract

[I] Kilometric continuum (KC) radiation was first identified from Geotail plasma wave observations. Past authors have shown that this emission has a frequency range that overlaps that of the auroral kilometric radiation (AKR) but is characterized by a fine structure of narrow-bandwidth, linear features that have nearly constant or drifting frequency. This fine structure is distinct from that of AKR. KC also apparently has a distinct source region probably associated with the low-latitude inner magnetosphere, consistent with direction-finding and ray-tracing results. We present new high-resolution electric and magnetic field observations of KC obtained by the Polar plasma wave instrument in the near-source region. These observations show intense electrostatic and less intense electromagnetic emissions near the magnetic equator at the plasmapause. Simultaneously, Geotail, located at 20 to 30 RE in radial distance, observes KC in the same frequency range. These data support a possible mode-conversion source mechanism near a region of high-density gradient. High-resolution data obtained from wideband receivers on board both Polar and Cluster show closely spaced bands of emission near the magnetic equator that may be due to many nearby independent sources of EM emission perhaps associated with density fluctuations or cavities in the plasmasphere.

Astrophysics

Details

Title: Subtitle: Near-source and Remote Observations of Kilometric Continuum Radiation from Multispacecraft Observations
Creators: J. D. Menietti - University of Iowa
R. R. Anderson - University of Iowa
J. S. Pickett - University of Iowa
D. A. Gurnett - University of Iowa
H. Matsumoto - Kyoto University
Resource Type: Journal article
Publication Details: Journal of Geophysical Research, Vol.108(A11), pp.1393-n/a
DOI: 10.1029/2003JA009826
ISSN: 0148-0227
eISSN: 2156-2202
Language: English
Date published: 11/2003
Description audience: PUBLIC
Academic Unit: Physics and Astronomy
Record Identifier: 9984627212502771

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