Relationship of noise in the frequency range of f between 100 and 500 kHz to auroral arcs and field-aligned current and implications regarding acceleration of auroral electrons

Details Relationship of noise in the frequency range of f between 100 and 500 kHz to auroral arcs and field-aligned current and implications regarding acceleration of auroral electrons Relationship of noise in the frequency range of f between 100 and 500 kHz to auroral arcs and field-aligned current and implications regarding acceleration of auroral electrons

Mar 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84..853k&link_type=abstract

Journal of Geophysical Research, vol. 84, Mar. 1, 1979, p. 853-868. Research supported by the National Research Council of Cana

Physics

2

Auroral Arcs, Electric Current, Electromagnetic Noise, Field Aligned Currents, High Energy Electrons, Low Frequencies, Noise Spectra, Auroral Electrojets, Electron Beams, Energy Spectra, Ground Truth, Ionospheric Currents, Isis Satellites, Luminous Intensity, Magnetic Signatures, Noise Measurement, Noise Propagation, Power Spectra, Velocity Distribution

Scientific paper

A combination of ground-based magnetometer data and Isis 2 satellite data on energetic particles, auroral luminosity, and electromagnetic and/or electrostatic noise measurements are used to provide a comprehensive picture of processes occurring on field lines that penetrate the auroral oval in the evening and midnight sectors. It is shown that noise measurements in the frequency range 100-500 kHz are typical of regions of upward current flow which are found in the region of discrete auroral features. In particular, the higher-energy electrons (a few keV) are associated with the higher-frequency noise, while the highest noise frequencies are observed in the center of discrete auroral arc regions. Finally, the physics of the relationship among the various electromagnetic and energetic particle signatures is discussed.

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