Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506..729r&link_type=abstract
In: Solar variability: from core to outer frontiers. The 10th European Solar Physics Meeting, 9 - 14 September 2002, Prague, Cze
Physics
Solar Flares: Loops, Solar Plasma
Scientific paper
Results of analysis of two post-flare loops systems observed in Hα line at the solar limb on 10 May 1998 are presented. The well-developed post-flare loops systems appeared as a result of two M 1.6 and M 3.9 GOES class solar flares in the NOAA 8220 active region. We analysed optical thickness and dynamics of separate blobs of the matter, using MSDP Hα spectra and Hα high spatial resolution filtergrams collected with the Large Coronagraph of Wroclaw University. The full (3-dimensional) velocity vectors of the individual blobs, which moved along the loops, were reconstructed on the basis of long series of filtergrams and spectral-images. The optical thicknesses were evaluated using Hα line-center images compiled from the MSDP data. The velocities of the individual blobs moving along the loops were of the order of 20 - 60 percent of the free-fall velocity. The optical thicknesses were equal to τ = 0.1-0.8, but when taking into account the influence of the velocities on determination of the true value of the optical thicknesses of the order of τ = 1.0-1.2.
Radziszewski Krzysztof
Rompolt Bogdan
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