Physics
Scientific paper
Jul 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jastp..72..900c&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 72, Issue 11-12, p. 900-911.
Physics
Scientific paper
The ionospheric responses to a large number (116) of moderate (-50≥Dst>-100 nT) geomagnetic storms distributed over the period (1980-1990) are investigated using total electron content (TEC) data recorded at Calcutta (88.38°E, 22.58°N geographic, dip: 32°N). TEC perturbations exhibit a prominent dependence on the local times of main phase occurrence (MPO). The storms with MPO during daytime hours are more effective in producing larger deviations and smaller time delays for maximum positive deviations compared to those with nighttime MPO. Though the perturbations in the equinoctial and winter solstitial months more or less follow the reported climatology, remarkable deviations are detected for the summer solstitial storms. Depending on the local times of MPO, the sunrise enhancement in TEC is greatly perturbed. The TEC variability patterns are interpreted in terms of the storm time modifications of equatorial electric field, wind system and neutral composition.
Chakraborty S. K.
Hajra R.
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