Investigation of long-duration arcade flares. II. Energy release

Details Investigation of long-duration arcade flares. II. Energy release Investigation of long-duration arcade flares. II. Energy release

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...465.1035k&link_type=abstract

Astronomy and Astrophysics, Volume 465, Issue 3, April III 2007, pp.1035-1040

Astronomy and Astrophysics

Astrophysics

5

Sun: Corona, Sun: Flares, Sun: X-Rays, Gamma Rays

Scientific paper

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 (E_H) 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.
Appendices are only available in electronic form at http://www.aanda.org

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