Physics
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991angeo...9...60b&link_type=abstract
Annales Geophysicae (ISSN 0939-4176), vol. 9, Jan. 1991, p. 60-69.
Physics
19
F Region, Ionospheric Electron Density, Magnetic Storms, Night Sky, Solar Activity Effects, Annual Variations, Magnetoactivity, Northern Hemisphere
Scientific paper
The effects of solar and magnetic activity on the latitudinal variations of nighttime enhancement in total electron content (TEC) have been investigated by considering TEC data from ten stations in the Northern Hemisphere. The frequency of occurrence, mean amplitude and mean half-amplitude duration of the enhancements are found to have strong seasonal dependence during solar minimum and little seasonal dependence during solar maximum. The enhancements become more pronounced and occur more frequently as the magnetic activity increases, especially at latitudes greater than about 50 deg. The time of peak enhancement is found to be dependent upon both latitude and season. There are no indications in the observations to suggest that the time of peak enhancement is affected by solar or magnetic activity. The derived latitudinal distributions are discussed in the light of the potential source mechanisms.
Bailey Graham J.
Balan Nanan
Nair R. B.
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