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  Study of flux-rope characteristics at sub-astronomical-unit distances using the Helios 1 and 2 spacecraft

Raghav, A., Gaikwad, S., Wang, Y., Shaikh, Z. I., Mishra, W., & Zao, A. (2020). Study of flux-rope characteristics at sub-astronomical-unit distances using the Helios 1 and 2 spacecraft. Monthly Notices of the Royal Astronomical Society, 495(2), 1566-1576. doi:10.1093/mnras/staa1189.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-C865-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-C866-6
Genre: Journal Article

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 Creators:
Raghav, Anil, Author
Gaikwad, Sandesh, Author
Wang, Yuming, Author
Shaikh, Zubair I, Author
Mishra , Wageesh1, Author
Zao, Ake, Author
Affiliations:
1Max Planck Institute for Solar System Research, Max Planck Society, Justus-von-Liebig-Weg 3, 37077 Göttingen, DE, ou_1125546              

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 Abstract: Magnetic flux ropes observed as magnetic clouds near 1 au have been extensively studied in the literature and their distinct features are derived using numerous models. These studies summarize the general characteristics of flux ropes at 1 au without providing an understanding of the continuous evolution of the flux ropes from near the Sun to 1 au. In the present study, we investigate 26 flux ropes observed by the Helios 1 and 2 spacecraft (from 0.3 to 1 au) using the velocity-modified Gold-Hoyle model. The correlation and regression analyses suggest that the expansion speed, poloidal speed, total magnetic helicity and twist per au of the flux rope are independent of heliospheric distance. The study implies that the aforementioned features are more strongly influenced by their internal properties compared with external conditions in the ambient medium. Moreover, the poloidal magnetic flux and magnetic energy of the studied flux ropes exhibit power-law dependence on heliospheric distance. A better understanding of the underlying physics and corroboration of these results is expected from the Parker Solar Probe measurements in the near future.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1093/mnras/staa1189
 Degree: -

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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 495 (2) Sequence Number: - Start / End Page: 1566 - 1576 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150