Observations of a detached, discrete arc in association with field line resonances

Details Observations of a detached, discrete arc in association with field line resonances Observations of a detached, discrete arc in association with field line resonances

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9615683s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Sept. 1, 1991, p. 15,683-15,695. Research supported by NSERC.

Physics

74

Auroral Arcs, Electron Precipitation, Geomagnetism, Magnetic Field Configurations, Magnetohydrodynamic Waves, Extremely Low Frequencies, Field Aligned Currents, Ion Cyclotron Radiation, Photometers, Riometers

Scientific paper

The magnetic fields and auroral structures associated with a field line resonance which occurred near local midnight and in the early morning sector are analyzed. Effects of the resonance are seen as pulsations in the magnetometer data, and the horizontal polarizations of the pulsations show a change in the sense of rotation across the arc. It is suggested that the oscillations in the precipitating electrons are caused by modulation in the ELF/VLF growth rates due to the presence of the magnetohydrodynamic waves associated with the resonance, by mode conversion to kinetic Alfven waves, or by the formation of electrostatic ion cyclotron waves due to field-aligned currents associated with a second field line resonance collocated with the arc. It is concluded that the modulation of ELF/VLF by magnetohydrodynamic waves on field lines near the plasmapause is the most likely cause of the auroral oscillations.

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