MHD evolution of a fragment of a CME core in the outer solar corona
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Publication:3444627
DOI10.1051/0004-6361:20065866zbMATH Open1118.85320arXivastro-ph/0701145OpenAlexW1998868267WikidataQ68598995 ScholiaQ68598995MaRDI QIDQ3444627
Author name not available (Why is that?)
Publication date: 4 June 2007
Published in: Astronomy & Astrophysics (Search for Journal in Brave)
Abstract: Detailed hydrodynamic modeling explained several features of a fragment of the core of a Coronal Mass Ejection observed with SoHO/UVCS at 1.7 Ro on 12 December 1997, but some questions remained unsolved. We investigate the role of the magnetic fields in the thermal insulation and the expansion of an ejected fragment (cloud) traveling upwards in the outer corona. We perform MHD simulations including the effects of thermal conduction and radiative losses of a dense spherical or cylindrical cloud launched upwards in the outer corona, with various assumptions on the strength and topology of the ambient magnetic field; we also consider the case of a cylindrical cloud with an internal magnetic field component along its axis. We find that a weak ambient magnetic field (beta~20) with open topology provides both significant thermal insulation and large expansion. The cylindrical cloud expands more than the spherical one.
Full work available at URL: https://arxiv.org/abs/astro-ph/0701145
Galactic and stellar structure (85A15) Hydrodynamic and hydromagnetic problems in astronomy and astrophysics (85A30)
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