Production of very energetic electrons in discrete aurora

Details Production of very energetic electrons in discrete aurora Production of very energetic electrons in discrete aurora

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.2696s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, March 1, 1989, p. 2696-2702.

Physics

9

Auroras, Electron Acceleration, High Energy Electrons, Velocity Distribution, Bremsstrahlung, Magnetic Fields, Magnetohydrodynamic Waves, Northern Hemisphere, Plasma Frequencies

Scientific paper

Data are presented showing that acceleration of electrons to energies in excess of 100-keV sometimes occurs on field lines associated with discrete auroral arcs. Velocity distributions suggest that acceleration is in directions primarily perpendicular to the magnetic field. The examples studied in the S3-3 data set indicate that the process can occur in the altitude range from the topside ionosphere to 5500 km. The explanation is that the field-aligned beam excites upper hybrid waves when it interacts with the dense ionospheric plasma. The waves efficiently scatter the beam in both energy and pitch angle.

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