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On the Dynamics of the Largest Active Region of the Solar Cycle 24

Published online by Cambridge University Press:  24 July 2018

Ranadeep Sarkar ,
Nandita Srivastava Open the ORCID record for Nandita Srivastava [Opens in a new window]  and
Sajal Kumar Dhara
Ranadeep Sarkar
Affiliation:
Udaipur Solar Observatory, Physical Research Laboratory, Badi Road, Udaipur 313001, India emails: ranadeep@prl.res.in, nandita@prl.res.in
Nandita Srivastava
Affiliation:
Udaipur Solar Observatory, Physical Research Laboratory, Badi Road, Udaipur 313001, India emails: ranadeep@prl.res.in, nandita@prl.res.in
Sajal Kumar Dhara
Affiliation:
Istituto Ricerche Solari Locarno, Universita della Svizzera Italiana, CH-6605 Locarno Monti, Switzerland email: sajal@irsol.ch
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Abstract

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We have studied the dynamics of the solar active region (AR) NOAA 12192 using full-disc continuum images and the vector magnetograms observed by the Helioseismic and Magnetic Imager (HMI) onboard Solar Dynamics Observatory (SDO). AR 12192 is the largest region of the solar cycle 24. It underwent a noticeable growth and produced 6 X-class, 22 M-class and 53 C-class flares during its disc passage. But the most peculiar fact of this AR is that it was associated with only one CME in spite of producing several X-class flares. In this work, we present the area evolution of this giant sunspot group during the first three rotations when it appeared as AR 12172, AR 12192 and AR 12209, respectively. We have also attempted to make a comparative study of the flare-related photospheric magnetic field and Lorentz force changes for both the eruptive and non-eruptive flares produced by AR 12192.

Keywords

Photospheresunspotsflarescoronal mass ejections (CMEs)
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. 32 - 35
Copyright
Copyright © International Astronomical Union 2018 

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