Proposal ID Hanaoka_234

Date of Proposal Apr 24 2000

firstname

Yoichiro

lastname

Hanaoka

institute

National Astronomical Obs. of Japan

address

2-21-1 Osawa, Mitaka
Tokyo 181-8588
Japan

email

hanaoka@nro.nao.ac.jp

phone

+81-422-34-3730

fax

+81-422-34-3742

proposal

The three-dimensional structure of the magnetic field in the source
region of CMEs is the key to understand how the stored magnetic energy
eventually causes an eruption. However, generally it is not easy to
study the three-dimensional magnetic structure based on
two-dimensional images. Nevertheless, a CME accompanied by a filament
eruption on 2000 February 26-27 is a very good event to study the
three-dimensional magnetic field structure. This event was very well
observed with SOHO/EIT and LASCO, Yohkoh, and the Nobeyama
Radioheliograph. The source region of this event is located near (but
not on) the limb. Therefore, we can investigate the surface magnetic
field of the CME source region and the structure of the filament
before the eruption, while the coronal loop structure above the CME
source region is clearly observed outside the limb without
contamination by the structures on the disk. Based on the preliminary
analysis, we found the following clues to study the magnetic field
structure which causes the CME.
- The LASCO images show that the helical structure of the erupting
filament found in EIT images before the eruption is kept during the
eruption up to about ten solar radii.
- The Coronal loop structure observed with EIT/Yohkoh shows that this
event is an eruption of a part of the quadrapolar magnetic field
structure consisting of two active regions.
We would like to construct a three-dimensional model of the magnetic
field of this event, and discuss the magnetic energy storage in the
CME source region.

inside_collab

None

consortium

no

topic

Coronal Mass Ejection

topic

title

Magnetic Field Structure of a CME on 2000 February 26-27

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