Electric Field Measurements at the Boundary of the Near-Earth Plasma Sheet as Measured by the Electron Drift Instrument (EDI) and the Electric Field and Waves Instrument (EFW ) on the CLUSTER Spacecraft

Details Electric Field Measurements at the Boundary of the Near-Earth Plasma Sheet as Measured by the Electron Drift Instrument (EDI) and the Electric Field and Waves Instrument (EFW ) on the CLUSTER Spacecraft Electric Field Measurements at the Boundary of the Near-Earth Plasma Sheet as Measured by the Electron Drift Instrument (EDI) and the Electric Field and Waves Instrument (EFW ) on the CLUSTER Spacecraft

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm72a0601t&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM72A-0601

Other

7807 Charged Particle Motion And Acceleration, 7811 Discontinuities, 7835 Magnetic Reconnection

Scientific paper

The boundary of the night-time plasma sheet connects both to the reconnection regions in the magnetotail and to the poleward auroral region near earth. In active times, fields and particle populations in this boundary near earth often show rapid transport of energy toward the ionosphere. On CLUSTER, three dimensional electric fields, including the component parallel to B, can be measured by combining the information from the double-probe (EFW, measuring potential differences in the spin plane), and those of the Electron Drift Instrument (EDI, measuring the perpendicular drift velocity of electrons). We will show combined data from the night-time plasma sheet where large electric fields are sometimes observed near the boundaries and particle populations make rapid changes. These fields show a complex spatial and temporal structure that appears to be neither constant in time nor space. At times, the Alfven waves observed on this boundary indicate that a dense ( order 1/cc ) layer of ions, predominantly oxygen, lies outside the plasma sheet in the otherwise rarified lobe plasma. As these ions are not seen by the composition analyzer on CLUSTER, CODIF, they are apparently very cold.

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