Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...465.1021k&link_type=abstract
Astronomy and Astrophysics, Volume 465, Issue 3, April III 2007, pp.1021-1034
Astronomy and Astrophysics
Astrophysics
5
Sun: Corona, Sun: Flares, Sun: X-Rays, Gamma Rays
Scientific paper
Aims:We present the analysis of the three well-observed long-duration arcade flares (LDAFs). We aim to find general properties of LDAFs. In this paper results concerning morphology and physical parameters in these flares are shown. Methods: Yohkoh observations, Kitt Peak Vacuum Telescope (KPVT) magnetograms and GOES/SEM measurements are used to determine morphology and evolution of the analysed flares and physical parameters of their loop-top kernels (temperature, density, altitude). Results: We found that: (1) a so-called arcade channel may exist in LDAFs; (2) the energy release in LDAFs occurs in several places simultaneously and the reconnection process is not uniform along the flaring arcade; (3) a presence of 20{-}30 MK hot plasma during the decay phase suggests that the reconnection occurs after the LDAF maximum.
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