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Journal of Physical Studies 13(3), Article 3904 [5 pages] (2009)
DOI: https://doi.org/10.30970/jps.13.3904 SPACE INHOMOGENEITY AND EVOLUTION OF MAGNETIC FIELD IN THE AREA OF WEAK SOLAR FLAREO. S. Andriets', V. G. Lozitsky
Taras Shevchenko National University of Kyiv, Astronomical Observatory, |
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The 4C solar flare of July 28, 2004 in AR NOAA 652 is studied. The flare projected on the sunspot of $N$ polarity with a magnetic field strength of 2700 G. The magnetic field measurements were made using $I \pm V$ profiles of $Hα$, Fe 6301.5, Fe 6302.5, FeI 5250.2, FeI 5250.6, FeI 5247.1, Cr 5247.6 lines. It was shown from a comparison of data for the lines of the green region that in flare the two-component structure had existed. In addition to the field strenght of 2500-2700\,G, the 5500-6000\,G smallscale structures had existed in the sunspot too. During 12\,min of flare evolution synchronous changes of flare emission in $Hα$ and magnetic field variations in the lines Fe 6301.5 and Fe 6302.5 were detected. New observational evidence to the practically zero vertical magnetic field gradient in the ‟photosphere-chromosphere” range was found.
PACS number(s): 96.60.Hv; 96.60.Q-; 96.60.Qe