Physics
Scientific paper
Mar 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83..983s&link_type=abstract
Journal of Geophysical Research, vol. 83, Mar. 1, 1978, p. 983-988. Research supported by the Department of Space of India.
Physics
Annual Variations, Atmospheric Ionization, F Region, Geomagnetism, Ionospheric Electron Density, Diurnal Variations, Solar Activity Effects, Thermosphere
Scientific paper
The origin of annual and subannual periodicities in F-region ionization is studied. Monthly median values of maximum electron density are harmonically analyzed for several high-latitude and auroral zone stations for each hour of the day during 1958 and 1964. A semiannual component exists in maximum electron density at all stations for the whole day in the high-sunspot year and during the daytime for the low-sunspot year. The annual component shows considerable day-night variation and north-south asymmetry during the high-sunspot year. It is observed that at night the amplitude of the annual component is large near 70 deg S and has a December maximum. It decreases toward the north and is negligible near 70 deg N geographic latitude. There is predominance of December phase globally. Various mechanisms are suggested to explain the results obtained.
Degaonkar S. S.
Shirke J. S.
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