Electron Dynamics Associated With Ion Beam Acceleration Above the Polar Cap

Details Electron Dynamics Associated With Ion Beam Acceleration Above the Polar Cap Electron Dynamics Associated With Ion Beam Acceleration Above the Polar Cap

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm13b1223f&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM13B-1223

Physics

2451 Particle Acceleration, 2712 Electric Fields (2411), 2776 Polar Cap Phenomena, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

During periods of northward IMF Bz, CLUSTER observed acceleration structures above the polar cap at relatively high altitudes (5-6 Re). These structures involves outflowing ion beams and convergent electric fields as expected in auroral zone in presence of field-aligned potential drops. Above the polar cap, the electron population presents various signatures. Accelerated electrons at energies of the hundred or so eV are sometimes observed simultaneously with the ion accelerations. From the analysis of both ion and electron populations, we estimate the potential distribution along magnetic field lines. It is shown that it can cover an extended altitude range along the magnetic field lines from the ionosphere up to higher altitudes than the spacecraft. The measurements at the 4 spacecraft allow to compute the size and the motion/stationarity of these structures. Finally, between the ion acceleration structures, CLUSTER detected the presence of outflowing electrons at energies lower than 100 eV. In conditions of Northward Bz, the polar cap appears as a very structured region which can play an important role in the plasma exchanges with distant regions of the magnetosphere.

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