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      https://www.ias.ac.in/article/fulltext/joaa/040/01/0004

    • Keywords

       

      Geomagnetic storms; coronal mass ejections (CME); space weather; severe storms.

    • Abstract

       

      The occurrence of total 113 geomagnetic storms during declining phase of Solar Cycle 24 (2015–2017) subdivided as about 105 moderate storms (${\rm Dst} = −50$ nT to $−$100 nT), 6 intense storms (${\rm Dst} = −100$ nTto $−$200 nT) and 2 severe storms (Dst < $−$200 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 6intense 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 intensegeomagnetic storms are due to coronal mass ejection at the Sun. Most of our results are in good accordance with other reported results.

    • Author Affiliations

       

      KALPANA PATEL1 ABHA SINGH2 S. B. SINGH3 A. K. SINGH3

      1. Department of Physics, SRM Institute of Science and Technology, Modinagar 201 204, India.
      2. Department of Physics, T. D. P. G. College, Jaunpur 222 002, India.
      3. Department of Physics, Banaras Hindu University, Varanasi 221 005, India.
    • Dates

       
  • Journal of Astrophysics and Astronomy | News

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