Photometric studies of the postnoon dayside cleft region

Details Photometric studies of the postnoon dayside cleft region Photometric studies of the postnoon dayside cleft region

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.6533d&link_type=abstract

Journal of Geophysical Research, vol. 84, Nov. 1, 1979, p. 6533-6539.

Physics

Auroral Zones, Electron Precipitation, Magnetospheric Instability, Photometry, Daytime, Emission Spectra, Geomagnetism, Oxygen Spectra, Zenith

Scientific paper

The present paper deals with ground-based photometric observations of the postnoon dayside cleft region, carried out from November 30 to December 19, 1977 with a 6-channel meridian-scanning photometer. Continuous observations of the 6300-A O I emission were used to map the postnoon cleft morphology. The cleft was located at 77 to 78 magnetic invariant latitude on geometrically quiet days and farther equatorward by 2 to 3 degrees on the most active days. During each afternoon, an equatorward movement of the cleft was observed after about 1400 MLT. The peak intensity of the 6300-A emission was usually 1 to 2 kR.

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