Hemispheric differences in the morphology of the high latitude ionosphere measured at about 500 km

Details Hemispheric differences in the morphology of the high latitude ionosphere measured at about 500 km Hemispheric differences in the morphology of the high latitude ionosphere measured at about 500 km

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987p%26ss...35..821t&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 35, June 1987, p. 821-826.

Physics

3

Ionospheric Electron Density, Northern Hemisphere, Southern Hemisphere, Upper Ionosphere, Magnetic Disturbances, Morphology, Topography

Scientific paper

Ambient electron density measurements made by the radio frequency capacitance probe on Ariel 4 have been analyzed in order to study the structures present at about 500 km altitude at latitudes poleward of + or - 50 deg Lambda during the 1971 Northern Hemisphere winter (December solstice) and the 1972 Southern Hemisphere winter (June solstice); data obtained on 94 days centered on each solstice have been used. The general morphology of, and the extreme densities within, the midlatitude electron density trough, the polar cap depletions, and the electron density enhancements associated with the cusp-auroral zone were determined statistically. Analyses of data acquired during quiet magnetic conditions show that the Northern and Southern Hemisphere winter ionospheres were significantly different; in particular, the Southern Hemisphere densities were lower than those in the Northern Hemisphere. The maximum electron densities observed in the Northern Hemisphere occurred in a magnetic-local-time range symmetrical about the 02-14 MLT meridian, whereas in the Southern Hemisphere the maxima were symmetrical with respect to the midnight-noon magnetic meridian.

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