Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001kfnt...17..485k&link_type=abstract
Kinematika i Fizika Nebesnykh Tel, vol. 17, no. 6, p. 485-495
Physics
Scientific paper
We study the plasma motions in the chromospheric and photospheric layers of a 2n/M2 two-ribbon flare at different stages of its evolution: 30 minutes before the flare, in the impulsive and gradual phases. The measurements of the line-of-sight velocity are made in 21 Fraunhofer lines formed in different photospheric layers and in the chromospheric Halpha, D_1 and D_2 Na I lines. The line-of-sight velocities in the layers of the H_alpha line core formation changed greatly. Upward motions were observed in these layers during the gradual phase. The largest velocity variations (up to 25 km/s) caused by gentle chromospheric evaporation were observed a few minutes after the second H_alpha maximum flare. There was an upflow in the photosphere and chromosphere at the level of Na I line core formation during the observations: the velocity variations were 1-4 km/s. An upflow occurred at the late phase: the velocity variations were 1-2 km/s in the photosphere and 1.5-7 km/s in the chromosphere.
Kondrashova N. N.
Pasechnik M. N.
Rudnikova K. G.
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