Multipoint and Multi-instrument Study of a Flux Transfer Event Crossing: Preliminary Results.

Details Multipoint and Multi-instrument Study of a Flux Transfer Event Crossing: Preliminary Results. Multipoint and Multi-instrument Study of a Flux Transfer Event Crossing: Preliminary Results.

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm12c..05r&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM12C-05

Physics

2700 Magnetospheric Physics, 2724 Magnetopause, Cusp, And Boundary Layers, 2772 Plasma Waves And Instabilities, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

Data from several instruments on Cluster (PEACE, CIS, EFW, FGM and STAFF) are used to investigate the transient interaction between the solar wind and the Earth's magnetic field. We study the crossing of an isolated FTE (January 26th, 2001, around 11:31 UT), presumably detached from the magnetopause. As the FTE is crossed (i) the modulus of the ion flow velocity (from CIS) is found to increase by about a factor 2, and its direction also changes. The ion flow is more or less anti-parallel to the magnetic field, and parallel to the current density (as determined from its magnetic signatures on the FGM experiments aboard the 4-Cluster spacecraft), at the edges of the FTE. Data from PEACE give evidence for enhanced electron fluxes, in particular in the directions parallel and anti-parallel to B. However the enhancement in the flux of relatively energetic electrons (> 1 keV) lasts much longer than that of electrons parallel to B, which suggests an escape from the magnetosphere. Conversely, when field aligned electric currents are measured the flux of medium energy electrons (about 100 eV) tends to be larger for electrons flowing along the magnetic field, than for electrons anti-parallel to B. This suggests that magnetosheath electrons flow earthward, inside the FTE. Waves observed on STAFF and EFW are shown to heat the electrons preferentially along the magnetic field, thereby explaining why enhanced fluxes of electrons, parallel and antiparallel to B are observed.

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