Physics
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995angeo..13..256j&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 13, no. 3, p. 256-261
Physics
3
Augmentation, Earth Ionosphere, Electron Density (Concentration), Night, Periodic Variations, Solar Cycles, Geomagnetism, Magnetic Effects, Scintillation, Solar Flux
Scientific paper
Various chracteristics of anomalous nighttime enhancement in ionospheric electron content (IEC) at Lunping (14.08 deg N geomagnetic), a station near the crest of the equatorial anomaly, have been presented by considering the IEC data for the 21st solar cycle. Out of a total of 1053 enhancements, 354 occur in pre-midnight and 699 occur in post-midnight hours, which indicates an overall dominance of post-midnight events at Lunping. The occurence is more frequent during summer, less during the equinox and least during the winter months. All the characteristics of the enhancements have seasonal dependencies and they reach their maximum values during summer months. The occurence of the pre-midnight events show positive and post-midnight events show negative correlation with solar activity. The results have been discussed and compared with those at low-latitude stations in India and Hawaii and at the mid-latitude station, Tokyo.
Gwal A. K.
Huang Yinn-Nien
Jain Sudhir
Vijay S. K.
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