A STATISTICAL SURVEY OF TAIL PLASMA SHEET ENERGETIC ELECTRONS

摘要

We use the database of Cluster RAPID energetic electronrnmeasurements from the tail seasons (when Clusterrnhas it's apogee in the magnetotail) of 2001-2004 to determinernthe occurrence and some properties of energeticrnelectrons in the magnetotail plasma sheet. A statisticalrnsurvey is done, using data from the Cluster CIS and FGMrninstruments and criteria similar to those used by (1), torndetermine plasma sheet time intervals. The data is orderedrnaccording to X and Y position in an aberrated geocentricrnsolar magnetic (AGSM) coordinate system, distancernfrom a model neutral sheet (2), plasma propertiesrnand external drivers. A dawn-dusk asymmetry is foundrnwhere the dawn fluxes are higher than at dusk, particularlyrnin the high beta plasma sheet.