Mathematics – Probability
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.2216b&link_type=abstract
Journal of Geophysical Research, vol. 85, May 1, 1980, p. 2216-2226.
Mathematics
Probability
Ionospheric Electron Density, Solar Cycles, Solar Flares, Sudden Ionospheric Disturbances, Annual Variations, Atmospheric Composition, Linear Polarization, Magnetic Storms, Northern Hemisphere
Scientific paper
Total electron content record from southern hemisphere stations showing 43 sudden increases of the total electron content (SITEC) during 1966-1977 are discussed. Relating these to solar flare data indicated the probability that a given flare will produce SITEC increases with the peak 10.7 solar flux, with the decreasing central distance of the flare, and with the value of Cos chi solar zenith angle. SITEC's are generally larger at lower altitudes in summer, but have little latitudinal variation in winter. Results demonstrate that rapid ionospheric recombination due to molecular ions is more important at higher latitudes in summer and at lower latitudes in winter; this reflects primarily the seasonal and latitudinal changes in the ratio N2/O, at heights above 150 km. It is concluded that SITEC rise rate measurements provide a useful tool for studying differences in atmospheric composition at different sites.
Buonsanto Michael J.
Titheridge J. E.
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