A Survey of Thermal (E < 30 keV) Electrons in the Near-Earth (XGSM > -20 RE) Magnetotail Observed by the PEACE instruments on the 4 Cluster Spacecraft.

Details A Survey of Thermal (E < 30 keV) Electrons in the Near-Earth (XGSM > -20 RE) Magnetotail Observed by the PEACE instruments on the 4 Cluster Spacecraft. A Survey of Thermal (E < 30 keV) Electrons in the Near-Earth (XGSM > -20 RE) Magnetotail Observed by the PEACE instruments on the 4 Cluster Spacecraft.

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm52a..07o&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SM52A-07

Physics

2740 Magnetospheric Configuration And Dynamics, 2744 Magnetotail, 2748 Magnetotail Boundary Layers, 2764 Plasma Sheet

Scientific paper

Between the beginning of July and the end of October 2001, the apogees of ESAs 4 spacecraft Cluster mission were located at radial distances of ~20 RE in the nightside magnetotail. The near-polar orbit means that the spacecraft cut from north-to-south through the tail region. At apogee, the spacecraft were in a configuration which is close to the nominal tetrahedral formation, with the inter-spacecraft separation of ~2000 km. In this paper, we present observations of electrons in energy range ~1 eV - 26 keV made by the Plasma Electron And Current Experiment (PEACE) on the 4 Cluster spacecraft as they pass through the magnetotail region. We survey the electron populations associated with the nightside magnetopause, the plasma mantle, the tail lobes, the plasma sheet and its boundary layers and the cross-tail current layer. We note the occurrence of high and low energy plasma sheet electron populations and the presence of a very diffuse but relatively energetic tailward-moving population within the tail lobe. We assess how the concurrent levels of geomagnetic activity affect these populations. With Cluster PEACE data, the 3-D configuration and evolution of these electron populations can also be determined for the first time.

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