Whistler chorus intensifications associated with convections and injections of low energy plasma sheet electrons evidenced by VELOX observations at Halley ground station

Details Whistler chorus intensifications associated with convections and injections of low energy plasma sheet electrons evidenced by VELOX observations at Halley ground station Whistler chorus intensifications associated with convections and injections of low energy plasma sheet electrons evidenced by VELOX observations at Halley ground station

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm33a0427h&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM33A-0427

Physics

2716 Energetic Particles: Precipitating, 2720 Energetic Particles: Trapped, 2774 Radiation Belts, 2788 Magnetic Storms And Substorms (7954), 2790 Substorms

Scientific paper

It has been suggested that the relativistic electron flux enhancements are caused by local electron energization resulting from resonant interactions with enhanced whistler-mode chorus emissions that have been observed on the dawn side of the magnetosphere. It has been also suggested that the whistler chorus may be enhanced by an interaction with the low energy plasma sheet electrons. Recently, using ground-based chorus observations from the VELOX instrument at Halley station as an indicator of magnetospheric chorus intensities, Lyons et al. [2005, JGR; Also to be present in this same session] have shown for the high speed stream periods on November, 2003 that it is the periods of enhanced convection that precede substorm expansions, and not the expansions themselves, that lead to the enhanced dawn-side chorus wave intensity. In the present paper, we have extended their work by examining substantially more periods of high speed streams during 2003 and have found that the conclusion by Lyons et al. generally holds true for any high speed stream periods that accompany the large amplitude Alfven waves of the IMF. The Alfven waves consist of successive (every 2-3 hrs) northward turnings proceeded by moderate southward periods that are responsible for the enhanced convection. Furthermore, using the same VELOX data, we have examined the relation of storm time injections to the whistler chorus excitation. We report an ideal storm time interval that shows the close association between the low energy injections, the whistler chorus intensification, and the relativistic electron enhancement. We will discuss how the storm time continuous injections such as a sawtooth event are generally related to the whistler chorus intensification.

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