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Ann. Geophys., 32, 91-97, 2014
https://doi.org/10.5194/angeo-32-91-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Regular paper
12 Feb 2014
Characteristics of equatorial ionization anomaly (EIA) in relation to transionospheric satellite links around the northern crest in the Indian longitude sector
A. Das1, K. S. Paul1, S. Halder3, K. Basu4, and A. Paul1,2 1S. K. Mitra Center for Research in Space Environment, University of Calcutta, 92 Acharya Prafulla Chandra Road, Calcutta-700009, India
2Institute of Radio Physics and Electronics, University of Calcutta, 92 Acharya Prafulla Chandra Road, Calcutta-700009, India
3Department of Physics, University of North Bengal, Siliguri-734013, India
4Department of Physics, K.N. College, Baharampore, Murshidabad, West Bengal-742101, India
Abstract. The poleward gradient of the equatorial ionization anomaly (EIA) introduces more intense propagation effects on transionospheric satellite links in comparison to the equatorward gradient. Characterization of the poleward gradient was performed during March–April, August–October 2011 and March–April 2012 using GPS total electron content (TEC) recorded from a chain of stations located more or less along the same meridian (88.5° E) at Calcutta, Baharampore, Farakka and Siliguri. The poleward gradients calculated on magnetically quiet days at elevation in excess of 50° at 14:00, 15:00 and 16:00 LT were found to have a strong correlation with GPS S4 observed from Calcutta during post-sunset-to-midnight hours. A threshold value of poleward TEC gradient is calculated above which there is a probability of scintillation at Calcutta with S4 ≥ 0.4.

Citation: Das, A., Paul, K. S., Halder, S., Basu, K., and Paul, A.: Characteristics of equatorial ionization anomaly (EIA) in relation to transionospheric satellite links around the northern crest in the Indian longitude sector, Ann. Geophys., 32, 91-97, https://doi.org/10.5194/angeo-32-91-2014, 2014.
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