Computer Science
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002kfnt...18..217b&link_type=abstract
Kinematika i Fizika Nebesnykh Tel, vol. 18, no. 3, p. 217-226
Computer Science
Scientific paper
We present the results of the study of the solar CCD HeI 1083 nm image series obtained on 27 August 1999 before and during the 2N/M5.5 solar flare in AR 8673, 8674 NOAA/USAF. The He I 1083 nm line depth was found to change in three main flare knots before the Hα flare beginning. No helium flare emission features were observed. It is shown that a considerable part of the AR was involved in the flare, with line depth increasing by 5-10% and even by 15-25% in some flare knots. The excitation transport speed along flare knots and the energy released in the flare in the He I 1083 nm line are estimated. It is found that the helium line depth changed most grossly in the AR areas located near the neutral line of the photospheric longitudinal magnetic component. Comparison of the helium images with the soft X-ray "Yohkoh" images of the flare shows that more intense helium flare knots are located mainly under coronal loop tops or feet. Our results suggest that the coronal radiation played a key role in the helium excitation in the flare.
Akimov L. A.
Beletsky S. A.
Belkina I. L.
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