Issue |
A&A
Volume 380, Number 2, December III 2001
|
|
---|---|---|
Page(s) | 704 - 713 | |
Section | Planets and planetary systems | |
DOI | https://doi.org/10.1051/0004-6361:20011251 | |
Published online | 15 December 2001 |
Two-dimensional multi-parameter fields of a limb flare loop system
1
Yunnan Observatory, CAS, Kunming 650011 and National Astronomical Observatories, CAS, Beijing 100012, PR China
2
United Laboratory of Optical Astronomy, CAS, Shanghai 200030, PR China
Corresponding author: Xiao Ma Gu, ssg@public.km.yn.cn
Received:
20
November
2000
Accepted:
7
August
2001
The 2D H spectral data of the post-flare loop system (PFLs) of August
17, 1989 are obtained and analyzed quantitatively. Four physical parameters
(the line-of-sight velocity V//, column number density of the hydrogen
atoms at the second level along the line-of-sight direction N2,
the excitation temperature Tex and the micro-turblence velocity Vt)
and their 2D distributions are derived.
The 2D fields of V//, N2, Tex and Vt exhibit
inhomogeneous and asymmetric properties in two loop legs.
Red-shift velocities in the south leg are smaller than those of
blue shift in the north leg where the velocity reaches 60 km s-1.
The values of N2 and Tex
in the south leg are all much higher than those in the north leg,
N2 ranges between 0.5 to
cm-2, while Tex ranges from 0.8 to
K, lower at the top
part than in the two legs.
A high temperature region is located in the middle of the
south leg. Vt at the top part is greater than that in the two
legs, with the average being 30~40 km s-1. Electron density ne and electron pressure Pe are estimated at 0.2~
cm-3 and at 0.04~0.12 dyn cm-2,
respectively. These results are compared with those obtained from the PFLs
of 1984 February 18.
Key words: Sun: flares / Sun: fundamental parameters
© ESO, 2001
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