Abstract
The effect of intense solar flares on total electron content (TEC) variability during the declining phase of solar cycle-24 is studied at the low-latitude station at Varanasi, India (Geog. Lat. 25.31° N, Geog. Long. 82.97° E, Geomag. Lat. 16.54° N, Geomag. Long. 157.09° E). In the present paper, we have chosen the intense solar flares that occurred during 9–13 March 2015, 1–2 January 2016, 12–14 February 2016, 6–8 August 2016, and 6–8 September 2017 in the solar cycle-24 period for which the data is available. Our results showed significant enhancements in TEC up to the order of 15 TECU during and after the solar flare events. We have also given a brief account of solar flare effect in TEC with and without geomagnetic disturbances, local time effects (solar zenith angle effects) and changing the location of the solar active region. In a few cases, our results revealed a delay in TEC response during the flare peak time as well as recovery time.
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Acknowledgements
This work is sponsored by the UGC–New Delhi under the DS Kothari Postdoctoral fellowship awarded to SSR vide UGC sanction No.F.4-2/2006 (BSR)/ES/17-18/0048. The work is partially supported by SERB, New Delhi, under the CRG project (File No: CRG/2019/000573) and partially by ISRO, Bengaluru, under ISRO-SSPS to BHU.
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Singh, A., Rao, S.S., Rathore, V.S. et al. Effect of intense solar flares on TEC variation at low-latitude station Varanasi. J Astrophys Astron 41, 19 (2020). https://doi.org/10.1007/s12036-020-09637-8
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DOI: https://doi.org/10.1007/s12036-020-09637-8