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

Published online by Cambridge University Press:  24 July 2018

Nandita Srivastava Open the ORCID record for Nandita Srivastava [Opens in a new window] ,
Zavkiddin Mirtoshev  and
Wageesh Mishra
Nandita Srivastava
Affiliation:
Udaipur Solar Observatory, Physical Research Laboratory, Badi Road, Udaipur 313001, India email: [email protected]
Zavkiddin Mirtoshev
Affiliation:
Department of Physics, Samarkand State University, 15 University Boulevard, Samarkand 140104, Uzbekistan email: [email protected]
Wageesh Mishra
Affiliation:
CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Sciences, University of Science and Technology of China, Hefei 230026, China email: [email protected]
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Abstract

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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.

Keywords

Coronal mass ejectionssolar wind plasmamagnetic fieldgeomagnetic storm.
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S335: Space Weather of the Heliosphere: Processes and Forecasts , July 2017 , pp. 65 - 68
Copyright
Copyright © International Astronomical Union 2018 

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