| Name: | Sandeep Kumar |
| Affiliation: | PHYSICAL RESEARCH LABORATORY |
| Conference ID : | ASI2024_452 |
| Title : | Continuous Rotation of a Stealth CME Observed in the Heliosphere on 5 October 2012 and Its Space Weather Impact |
| Authors : | Sandeep Kumar1 , Dinesh V. Hegde2, Nandita Srivastava1, Nikolai Pogorelov2, Nat Gopalswamy3, Seiji Yashiro3
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| Authors Affiliation: | 1. Udaipur Solar Observatory, PRL INDIA,
2. University of Alabama in Huntsville, USA
3. NASA Goddard Space Flight Center, USA
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| Mode of Presentation: | Poster |
| Abstract Category : | Sun, Solar System, Exoplanets, and Astrobiology |
| Abstract : |
Coronal Mass Ejections (CMEs) are subject to changes in their direction of propagation, their tilt, and other properties as they propagate through the heliosphere. This is because CMEs interact with the ambient solar wind and other large-scale magnetic field structures.
We report on the 5 October 2012 stealth CME observations using coronagraphs and Heliospheric Imager data. We find clear evidence of a continuous increase in the tilt of the CME by fitting the Graduated Cylindrical Shell (GCS) model at different heliocentric distances. Further, by implementing the force-free magnetic flux rope model (Marubashi et al. 2007 ) on in-situ observations measured at L1, we found a larger value of tilt as compared to the tilt measured in the HI1 field of view, i.e., approximately 58Rsun. This finding confirmed the continuous rotation of the CME in the heliosphere. We find that the significant change in the tilt of the CME played a crucial role in its space weather impact, leading to a major geomagnetic storm with Dst -105 nT.
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