Physics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9811531x&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A7, p. 11,531-11,541.
Physics
52
Auroral Spectroscopy, Light Modulation, Lines Of Force, Magnetohydrodynamic Waves, Plasma Resonance, Magnetometers, Power Spectra, Visual Observation
Scientific paper
The modulation of optical aurora in the 5577- and 4709-A emission lines in the frequency range of 1-4 mHz is investigated on the basis of optical aurora and magnetometer data from the Canadian Aurora Network for the OPEN Unified Study (CANOPUS) array in Canada. Four events, chosen to represent different characteristics of timing and location, are analyzed. The power spectra featured discrete spectral peaks usually near 1.3, 1.9, and 3.1 mHz. Latitudinal phase shifts of about 180 deg were observed across the latitudinal maximum of a given frequency peak. These observations point to the field line resonance as a major factor in the modulation of precipitation and possibly in the acceleration of electrons in forming auroral arcs. It is demonstrated that the modulation phenomena are common features occurring in the auroral oval, observable in an extensive latitude range, from 66 to 73 deg invariant latitude.
Creutzberg F.
Hughes Terrence J.
Liu Wende
Samson John C.
Xu Lun Biao
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