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Causes responsible for intense and severe storms during the declining phase of Solar Cycle 24

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Abstract

The occurrence of total 113 geomagnetic storms during declining phase of Solar Cycle 24 (2015–2017) subdivided as about 105 moderate storms (\(\hbox {Dst} = -50\, \hbox {nT}\) to \(-100\) nT), 6 intense storms (\(\hbox {Dst} = -100\, \hbox {nT}\) to \(-200\) nT) and 2 severe storms (\(\hbox {Dst} < -200\, \hbox {nT}\)) has been diagnosed on the basis of 5 day active window through the CACTus (Computer aided CME tracking) software. A detailed study has been carried out for the 6 intense and 2 severe storms. It is inferred that CMEs are the major source of geomagnetic storms to occur. Out of the 6 intense and 2 severe storms, only 1 has been observed with the origin of CIR. Thus, all analyzed intense geomagnetic storms are due to coronal mass ejection at the Sun. Most of our results are in good accordance with other reported results.

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Acknowledgements

The author’s team acknowledges the World Data Center for the geomagnetism at Kyoto University, Japan, NASA/GSFC for providing the platform of Omniweb (https://omniweb.gsfc.nasa.gov/form/dx1.html) for obtaining the plots and data of various magnetic field with its component, solar indices and plasma parameters, etc. Space Weather Live Link was useful to get the real time solar activity and auroral activity to get the solar parameters. The authors are also thankful to the SIDC at the Royal Observatory of Belgium who provided the data from the CACTus CME catalog, generation and maintenance. The work is partially supported by ISRO, Bengaluru, under ISRO-SSPS to BHU. The author (SBS) is thankful to the DST-PURSE (5050) Grant for providing Research Associateship. The authors thank both the reviewers for providing valuable comments and suggestions to improve the quality of the manuscript.

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Correspondence to A. K. Singh.

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Patel, K., Singh, A., Singh, S.B. et al. Causes responsible for intense and severe storms during the declining phase of Solar Cycle 24. J Astrophys Astron 40, 4 (2019). https://doi.org/10.1007/s12036-018-9569-7

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  • DOI: https://doi.org/10.1007/s12036-018-9569-7

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