MHD evolution of a fragment of a CME core in the outer solar corona
Abstract
Context: Detailed hydrodynamic modeling explained several features of a fragment of the core of a Coronal Mass Ejection observed with SoHO/UVCS at 1.7 R⊙ on 12 December 1997, but some questions remained unsolved.
Aims: 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.
Methods: 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.
Results: We find that a weak ambient magnetic field (β ∼ 20) with open topology provides both significant thermal insulation and large expansion. The cylindrical cloud expands more than the spherical one.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- March 2007
- DOI:
- 10.1051/0004-6361:20065866
- Bibcode:
- 2007A&A...464..753P
- Keywords:
-
- Sun: coronal mass ejections (CMEs);
- magnetohydrodynamics (MHD);
- Sun: corona