Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008a%26a...492l..29c&link_type=abstract
Astronomy and Astrophysics, Volume 492, Issue 2, 2008, pp.L29-L32
Astronomy and Astrophysics
Astrophysics
4
Sun: Coronal Mass Ejections (Cmes), Magnetohydrodynamics (Mhd)
Scientific paper
Aims: Our goal is to combine the Advanced Composition Explorer (ACE) data with numerical simulations to determine the initial characteristics of the halo coronal mass ejection (CME), which was observed on April 4, 2000. Methods: The evolution of a CME from the Sun to 1 AU is simulated in the framework of 2.5 D (axi-symmetric) ideal Magnetohydrodynamics (MHD). The initial parameters of the CME model are adjusted to reproduce the ACE data as accurately as possible. The initial parameters leading to the best fit are then assumed to be the most plausible initial parameters of the CME event. Results: Once the ACE data and the transit time were successfully reproduced, we concluded that, at 1.5 R_&sun;, the CME had a maximal magnetic field strength of 2.5 × 10-4 T and a total mass of 6.7 × 1012 kg, and the CME linear speed up to 30 R_&sun; was 1524 km s-1.
Chané Emmanuel
der Holst Bart van
Poedts Stefaan
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