The velocity field and X-ray spectrum of the flare of 1981 May 13

Details The velocity field and X-ray spectrum of the flare of 1981 May 13 The velocity field and X-ray spectrum of the flare of 1981 May 13

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989cha%26a..13..454l&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 13, Issue 4, p. 454-462.

Astronomy and Astrophysics

Astrophysics

Scientific paper

The Hα velocity field at 0516 UT during the eruption of the X1.5/3B flare in the active region E58 N11 (Boulder 3106) on 1981 May 13, obtained with the horizontal solar spectrograph of Yunnan Observatory is given in this paper. A comparative analysis of the velocity field with the magnetic field shows that the velocity field is related to the gradient and neutral line of the magnetic field and the brightness of the flare maximum changes in the velocity field of +/-15 km/s occurs at the location of greatest magnetic field gradient.
The neutral line of the magnetic field (h∥ = 0) basically matches the zero velocity line (v∥ = 0) between the two bright ribbons. But they do not match between the two bright knots where the filament is twisted and ascends. The spectral lines show the sloping morphology, from which we deduced the dynamical parameters of the twist of the rising filament.

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