Uni- and Bi-directional Electron Conics Observed by Cluster

Details Uni- and Bi-directional Electron Conics Observed by Cluster Uni- and Bi-directional Electron Conics Observed by Cluster

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm31a..01w&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SM31A-01

Physics

2740 Magnetospheric Configuration And Dynamics

Scientific paper

Heated and accelerated electrons are often observed on perigee passes of Cluster near 5-6 RE. On a typical pass through the mid-altitude plasma sheet, one observes the incoming and mirrored plasma sheet electron population. Depressed fluxes are observed at 0 o and 180 o with a width greater than the atmospheric loss cone. These fluxes appear to be modulated at frequencies that are in the ULF band. Similar magnetic fluctuations are observed in magnetometer data. At energies below this near-Maxwellian plasma sheet population, electrons are observed to have rapid variations spatially, temporally, and in energy. These variations in the lower energy population are correlated with ULF waves. No clear occurrence correlation is seen with higher frequency waves, including solitary waves. PEACE has a 15 o angular resolution. This makes it difficult to distinguish between a true parallel heated flux and a perpendicularly heated population. One observes both upward and downward uni-directional beams and bi-directional beams. On February 23, 2001, there is clear evidence that at least at times, these beams are unresolved, folded electron conics. Conics are even observed at 90 o, suggesting that the heating mechanism moves up to the satellite from lower altitudes. Four spacecraft field, wave, and particle data are presented to investigate the wave-particle relationships associated with these events, especially the 90 o conics. The goal is to identify possible heating mechanisms.

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