2-D NUMERICAL SIMULATIONS OF ERUPTING CORONAL MAGNETIC FIELDS - Comparison with the Yohkoh SXT data

mi019.setiahadi01
Posted:  12-Oct-96
Updated:
Events specified: N/A

Authors: 1. Bambang Setiahadi, 2. Bachtiar Anwar, 3. Maki Akioka,

Takashi Sakurai

     Watukosek Solar Observatory, Watukosek, Gempol P.O. Box 04,     
   Pasuruan 67155, INDONESIA E-mail:  bsetia@rad.net.id
    
 banwar@crl.go.jp, bachtiar@flare6.solar.isas.ac.jp     
    
 akioka@crl.go.jp     
    
 sakurai@uni.mtk.nao.ac.jp

Motivation: The Yohkoh SXT data show coronal loops of many kinds (magnetically potensial or sheared loops) which change in brightness and morphology with time. The coronal loops may erupt abruptly and may produce a mass ejection.

In order to understand the mechanisms responsible for such kind of eruption, we have performed two-dimensional numerical simulations of erupting coronal magnetic fields. In our models, the initial condition of the magnetic loop is a magnetohydrostatic balance between the plasma pressure and magnetic pressure. The magnetic topology is initially in quasi static configuration. The preliminary results show that, under such initial conditions, a pressure disturbance at the base of the loop caused instability (Setiahadi, 1990). The arcade then turned into an erupting coronal magnetic fields which is closely resemble to coronal mass ejection of a bow type ( Filippov et al., 1993; Setiahadi et al., 1995a; Setiahadi et al., 1995b). We also studied the non-linear evolution of some physical parameters such as pressure, density, and kinetic energy during the simulated eruption.

We will search for the limb events showing an eruption of the coronal loops from the SXT FFI and PFI images. Derive some physical parameters of the loops during their evolution and then compare them with the computed one.

References: Filippov, M., E. Golbraikh, R. Steinitz (1993), MASKED CORONAL MASS EJECTIONS: AN ATTEMPT TO DEMASK THEM, IAU Coll. no 144, pp. 101-108, September 20-24, 1993 Setiahadi, B., B. Anwar, T. Sakurai (1995a), 2D MHD SIMULATION OF CME

   GENERATED INTERPLANETARY SHOCK WAVES, The Ninth International 
   Symposium on Equatorial Aeronomy (ISEA), Bali, Indonesia, 
   March 20-24, 1995
Setiahadi, B., B. Anwar, T. Sakurai (1995b), SIMULATION OF MHD SHOCK

WAVES IN SOLAR CME, IAU Coll. no. 153 Setiahadi, B. (1990), THE INITIATION OF SOLAR CORONAL MASS EJECTION: MHD SIMULATION OF DISEQUILIBRIUM IN A MAGNETIC ARCADE, Master Thesis, Tokyo University.