Indian Journal of Radio & Space Physics

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Spatiotemporal Distribution Of Ionospheric Irregularities Over India During St. Patrick‘s Day Storm


Affiliations
1 Space Applications Centre, Ambawadi Vistaar, Ahmedabad, Gujarat 380 015, India

The irregularities formed over the equatorial ionospheric region over the Indian sector have been studied for the first time for the day of the most intense geomagnetic storm of solar cycle-24, which occurred on 17.03.2015, using Rate of TEC Index (ROTI) as the index for the study. These values have been derived using the measurements done with the TEC network receivers of the Indian SBAS system, GAGAN. Spatial and temporal variations of ROTI have been observed and compared to the same parameters on a quiet day with occurrence of nominal scintillation. The latitudinal symmetry of the irregularities for a given local time was evident. It has been found that the ionospheric irregularities formed over this region get immensely enhanced due to the storm in terms of its intensity and spatial extent, as well. The temporal spread of the irregularities has been observed and the statistical variations of the occurrences were compared with respect to those on quiet days. The results have provided few interesting observations including an understanding of the profundity and extensiveness of the irregularities and of the possibilities of consequent scintillation for the navigation signal over Indian region during space weather induced intense geomagnetic disturbances.
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  • Spatiotemporal Distribution Of Ionospheric Irregularities Over India During St. Patrick‘s Day Storm

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Authors

Rajat Acharya
Space Applications Centre, Ambawadi Vistaar, Ahmedabad, Gujarat 380 015, India
Randhir Singh
Space Applications Centre, Ambawadi Vistaar, Ahmedabad, Gujarat 380 015, India
Radhika Chipade
Space Applications Centre, Ambawadi Vistaar, Ahmedabad, Gujarat 380 015, India

Abstract


The irregularities formed over the equatorial ionospheric region over the Indian sector have been studied for the first time for the day of the most intense geomagnetic storm of solar cycle-24, which occurred on 17.03.2015, using Rate of TEC Index (ROTI) as the index for the study. These values have been derived using the measurements done with the TEC network receivers of the Indian SBAS system, GAGAN. Spatial and temporal variations of ROTI have been observed and compared to the same parameters on a quiet day with occurrence of nominal scintillation. The latitudinal symmetry of the irregularities for a given local time was evident. It has been found that the ionospheric irregularities formed over this region get immensely enhanced due to the storm in terms of its intensity and spatial extent, as well. The temporal spread of the irregularities has been observed and the statistical variations of the occurrences were compared with respect to those on quiet days. The results have provided few interesting observations including an understanding of the profundity and extensiveness of the irregularities and of the possibilities of consequent scintillation for the navigation signal over Indian region during space weather induced intense geomagnetic disturbances.