Physics
Scientific paper
Sep 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.5319m&link_type=abstract
Journal of Geophysical Research, vol. 84, Sept. 1, 1979, p. 5319-5324.
Physics
3
Auroras, Diurnal Variations, Electron Precipitation, Geomagnetism, Magnetic Disturbances, Annual Variations, Data Acquisition, Graphs (Charts), Precession, Radiation
Scientific paper
This paper examines the auroral oval variation during prolonged, quiet geomagnetic periods when the auroral emissions were too weak to be detected by the DMSP auroral images, and determines the minimum size of the auroral oval by using the precipitating auroral electron data from DMSP satellites. An examination of the equatorial boundary of the auroral oval reveals a periodic variation of its latitudinal location. The observed latitudinal variation is attributed to UT diurnal variation of the auroral oval size in association with the daily precession of the geomagnetic pole. The auroral oval is smaller when the northern geomagnetic pole is near the local midnight around 0600 UT, and it is larger when the northern geomagnetic pole is near the local noon around 1800 UT. The equatorial edges of the evening sector of the quiet auroral oval are located at about 72 deg and 69 deg, respectively, which correspond to the minimum auroral oval.
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