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H alpha line impact linear polarization observed in the 23 July 2002 flare with the Large Solar Vacuum Telescope (LSVT)
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Natalia Firstova Submitted: 2012-05-29 21:35
We represent results of research of proton flare 2B/X4.8, observed on the Large Solar Vacuum Telescope (LSVT) at the Baikal Astrophysical Observatory in a spectropolarimetric mode with high spatial and spectral resolution. We have found evidence for Hα line impact linear polarization in several cases, predominantly, during the initial moments of flare. Of the ?α line 606 cuts made along dispersion in 53 spectrograms, a polarizing signal was found more or less confidently found in 60 cuts (13 spectrograms). Mainly, polarization was observed in one kernel of flare. A typical feature of this kernel was that line was observed with a reversal in the central part of this kernel that created a dip in the kernel center in a photometric cut. The size of these dips and the size of sites with the linear polarization coincide and are equal 3 ? 6 arc sec. The maximum polarization degree in this kernel reached 15 %. The polarization direction in the kernel is radial except for first two frames with the polarization direction was both radial and tangential. Thus, there is an analogy of the effects observed at the chromospheric level in this kernel (polarization and depression in line cernel) with the temporal variation of the HXR sources.
Authors: Firstova N.M., Polyakov V.I., Firstova A.V.
Projects: None
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Publication Status: Solar Physics (accepted)
Last Modified: 2012-05-30 08:24
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