Total electron content at low latitudes |
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Authors: | Malkiat Singh H S Gurm M R Deshpande R G Rastogi G Sethia A R Jain A V Janve R K Rai V M Patwari B S Subbarao |
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Institution: | (1) Department of Physics, Punjabi University, 147 002 Patiala;(2) Physical Research Laboratory, 380 009 Ahmedabad;(3) Indian Institute of Geomagnetism, 400 005 Bombay;(4) Department of Physics, University of Udaipur, 313 001 Udaipur;(5) AV Parekh Technical Institute, 360 001 Rajkot |
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Abstract: | Radio beacon from ATS-6 at 140 MHz was used to measure the changes in the polarization angle (Faraday rotation) at Bombay,
Rajkot, Ahmedabad, Udaipur and Patiala during October 1975 to July 1976. In this paper, results of diurnal, seasonal and latitudinal
variations in total electron content (TEC) derived from these measurements are reported. The amplitude of diurnal peak is
found to be higher at Rajkot, Ahmedabad and Udaipur as compared to that at Patiala or Bombay, indicating that the peak of
Appleton anomaly in the latitudinal variation of TEC was close to the latitude of Ahmedabad. The diurnal maximum of TEC occurs
around the same time during summer and winter months. The peak electron content shows a semiannual variation at all the stations
with large values in equinoxes as compared to winter and summer. The TEC at Bombay shows a seasonal anamoly with high values
in winter as compared to summer. The paper describes the development of latitudinal anomaly with the time of the day for different
seasons. This anomaly is maximum during 1000 to 1800 LT and is located between 12° and 14° N (dip latitude) in summer and
equinoxes and at about 10°N in winter. |
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Keywords: | Ionospheric electron content equatorialF region anomaly |
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