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1 results

  • Geomagnetic Consequences of Interacting CMEs of June 13-14, 2012

  • Nandita Srivastava, Zavkiddin Mirtoshev, Wageesh Mishra
  • Journal:
    Proceedings of the International Astronomical Union / Volume 13 / Issue S335 / July 2017
    Published online by Cambridge University Press:
    24 July 2018, pp. 65-68
    Print publication:
    July 2017
    • Article
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  • We have studied the consequences of interacting coronal mass ejections (CMEs) of June 13-14, 2012 which were directed towards Earth and caused a moderate geomagnetic storm with Dst index ~ −86 nT. We analysed the in-situ observations of the solar wind plasma and magnetic field parameters obtained from the OMNI database for these CMEs. The in-situ observations show that the interacting CMEs arrive at Earth with the strongest (~ 150 nT) Sudden Storm Commencement (SSC) of the solar cycle 24. We compared these interacting CMEs to a similar interaction event which occurred during November 9-10, 2012. This occurred in the same phase of the solar cycle 24 but resulted in an intense geomagnetic storm (Dst ~ −108 nT), as reported by Mishra et al. (2015). Our analysis shows that in the June event, the interaction led to a merged structure at 1 AU while in the case of November 2012 event, the interacted CMEs arrived as two distinct structures at 1 AU. The geomagnetic signatures of the two cases reveal that both resulted in a single step geomagnetic storm.