Volume 380, Number 2, December III 2001
|Page(s)||704 - 713|
|Section||Planets and planetary systems|
|Published online||15 December 2001|
Two-dimensional multi-parameter fields of a limb flare loop system
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, firstname.lastname@example.org
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.