| Issue |
A&A
Volume 465, Number 3, April III 2007
|
|
|---|---|---|
| Page(s) | 1035 - 1040 | |
| Section | The Sun | |
| DOI | https://doi.org/10.1051/0004-6361:20065424 | |
| Published online | 22 January 2007 | |
Investigation of long-duration arcade flares*
II. Energy release
Instytut Astronomiczny Uniwersytetu Wrocławskiego, Kopernika 11, 51-622 Wrocław, Poland e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Received:
12
April
2006
Accepted:
20
December
2006
Abstract
Aims.We analyse three well-observed long-duration arcade flares (LDAFs) to find their general properties. Results concerning energy release in LDAFs (energy balance and diagnostic diagrams) are shown.
Methods.Yohkoh observations and Kitt Peak Vacuum Telescope magnetograms are used to determine physical parameters of flare loop-top kernels (temperature, density, altitude). Using these parameters the energy release is studied in detail.
Results.We found that: (1) the energy release in LDAFs occurs during their whole decay phase; (2) the kernel heating (EH) is of the order of 0.01–1 erg cm-3 s-1; (3) the kernels usually cannot be distinguished in SXT images when EH is drops below a particular value. This value depends on the altitude of the kernels.
Key words: Sun: corona / Sun: flares / Sun: X-rays, gamma rays
Appendices are only available in electronic form at http://www.aanda.org
© ESO, 2007
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.