Near-source and remote observations of kilometric continuum radiation from multispacecraft observations

Details Near-source and remote observations of kilometric continuum radiation from multispacecraft observations Near-source and remote observations of kilometric continuum radiation from multispacecraft observations

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.1393m&link_type=abstract

Journal of Geophysical Research, Volume 108, Issue A11, pp. SMP 4-1, CiteID 1393, DOI 10.1029/2003JA009826

Physics

7

Magnetospheric Physics: Plasma Waves And Instabilities, Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Magnetospheric Physics: Plasmasphere, Radio Science: Waves In Plasma

Scientific paper

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.

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