ICME-Driven Geoeffectiveness: Insights from Planar Magnetic Structures
Kalpesh
Ghag
Department of Physics, University of Mumbai
Author-Anil Raghav
Affiliation-Department of Physics, University of Mumbai, Vidyanagari, Santacruz (E), Mumbai 400098, India
Author-Neha Kushe
\affiliation{Department of Physics, University of Mumbai, Vidyanagari, Santacruz (E), Mumbai 400098, India}
Author-Sneha Vengurlekar
Affiliation-Department of Physics, University of Mumbai, Vidyanagari, Santacruz (E), Mumbai 400098, India
Author-Ankush Bhaskar
Affiliation-Space Physics Laboratory, Vikram Sarabhai Space Centre, ISRO, Thiruvananthapuram 695022, Kerala, India
Author-Vinit Pawaskar
Affiliation-Department of Physics, University of Mumbai, Vidyanagari, Santacruz (E), Mumbai 400098, India
Author-Omkar Dhamane
Affiliation-Department of Physics, University of Mumbai, Vidyanagari, Santacruz (E), Mumbai 400098, India
Author-Zubair Shaikh
Affiliation-Space Sciences Laboratory, University of California, Berkeley, CA 94720, USA
Author-Prathmesh Tari
Affiliation-Department of Physics, University of Mumbai, Vidyanagari, Santacruz (E), Mumbai 400098, India
Author-Kishor Kumbhar
Affiliation-Department of Physics, University of Mumbai, Vidyanagari, Santacruz (E), Mumbai 400098, India
Author-Greg Hilbert
Affiliation-Department of Physics, University of Mumbai, Vidyanagari, Santacruz (E), Mumbai 400098, India
Affiliation-Department of Physics, University of Mumbai, Vidyanagari, Santacruz (E), Mumbai 400098, India
Author-Neha Kushe
\affiliation{Department of Physics, University of Mumbai, Vidyanagari, Santacruz (E), Mumbai 400098, India}
Author-Sneha Vengurlekar
Affiliation-Department of Physics, University of Mumbai, Vidyanagari, Santacruz (E), Mumbai 400098, India
Author-Ankush Bhaskar
Affiliation-Space Physics Laboratory, Vikram Sarabhai Space Centre, ISRO, Thiruvananthapuram 695022, Kerala, India
Author-Vinit Pawaskar
Affiliation-Department of Physics, University of Mumbai, Vidyanagari, Santacruz (E), Mumbai 400098, India
Author-Omkar Dhamane
Affiliation-Department of Physics, University of Mumbai, Vidyanagari, Santacruz (E), Mumbai 400098, India
Author-Zubair Shaikh
Affiliation-Space Sciences Laboratory, University of California, Berkeley, CA 94720, USA
Author-Prathmesh Tari
Affiliation-Department of Physics, University of Mumbai, Vidyanagari, Santacruz (E), Mumbai 400098, India
Author-Kishor Kumbhar
Affiliation-Department of Physics, University of Mumbai, Vidyanagari, Santacruz (E), Mumbai 400098, India
Author-Greg Hilbert
Affiliation-Department of Physics, University of Mumbai, Vidyanagari, Santacruz (E), Mumbai 400098, India
Oral
(Student Speaker)
Abstract: Interplanetary coronal mass ejections (ICME) are large-scale eruptions from the Sun and prominent drivers of space weather disturbances, especially intense/extreme geomagnetic storms. Recent studies by our group showed that ICME sheaths and/or magnetic clouds (MC) could be transformed into a planar magnetic structure (PMS), and we speculate that these structures might be more geo-effective. Thus, we statistically investigated the geo-effectiveness of planar and non-planar ICME sheaths and MC regions. We analyzed 420 ICME events observed from 1998 to 2017, and we found that the number of intense (−100 to −200 nT) and extreme (<−200 nT) geomagnetic storms are large during planar ICMEs (almost double) compared to non-planar ICMEs. In fact, almost all the extreme storm events occur during PMS molded ICME crossover. The observations suggest that planar structures are more geo-effective than non-planar structures. Thus, the current study helps us to understand the energy transfer mechanism from the ICME/solar wind into the magnetosphere and space-weather events.
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