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Sunspots and geomagnetic storms during solar cycle-23

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Abstract

Geo-magnetic storms generally occur due to abnormal conditions in the interplanetary magnetic field (IMF) and solar wind plasma emissions caused by various solar activities. The Disturbance storm time (Dst) index is used to identify more than 220 storms which occurred in time interval 1996–2007, the span of solar cycle-23. Using the minimum Dst value as an indicator, we classify the storms as moderate (138), strong (67), severe (11), and great (4). We have analyzed and studied them statistically. We have found that yearly occurrences of geomagnetic storm are strongly correlated with 11 year sunspot cycle, but no significant correlation between the maximum and minimum phase of solar cycle-23 has been found. It is also found that solar cycle-23 is remarkable for occurrence of intense geomagnetic storms during its declining phase. It is also observed that Halo CME is the main cause to produce geomagnetic storms. The results are discussed in the present paper.

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Acknowledgments

Authors are grateful to Director of Inter University Centre of Astronomy and Astrophysics (IUCAA) for providing research facilities at IUCAA Pune (India). Authors are also thankful to Durgesh Tripathi (IUCAA) for their valuable discussion about CMEs.

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Authors and Affiliations

  1. School of Studies in Physics, Jiwaji University, Vidya Vihar, Gwalior, 474 011, Madhya Pradesh, India

    B. S. Rathore, S. C. Kaushik, R. S. Bhadoria, K. K. Parashar & D. C. Gupta

  2. Govt. PG College, Datia, 475 661, Madhya Pradesh, India

    S. C. Kaushik

Authors
  1. B. S. Rathore
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  2. S. C. Kaushik
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  3. R. S. Bhadoria
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  4. K. K. Parashar
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  5. D. C. Gupta
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Correspondence to B. S. Rathore.

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Rathore, B.S., Kaushik, S.C., Bhadoria, R.S. et al. Sunspots and geomagnetic storms during solar cycle-23. Indian J Phys 86, 563–567 (2012). https://doi.org/10.1007/s12648-012-0106-2

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  • DOI: https://doi.org/10.1007/s12648-012-0106-2

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