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Coronal structure and heating: Comparison between SXT/Yohkoh observations of an active region and magnetogram (1996)

Hagyard, M. J. ; Wu, S. T. ; Cheng, C.-C. ; [et al.]

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Publication Date: 2011-08-24

Description: We have studied the magnetic structure in AR 7150 (S09E06) observed on 29 April 1992 by the Soft X-Ray Telescope (SXT) on Yohkoh. The observed X-ray images are compared with force-free magnetic fields with different values of alpha, extrapolated from the Marshall Space Flight Center (MSFC) photospheric magnetogram observed at the same time. The results show that the magnetic field of the active region is not potential. Different groups of loops are characterized by different values of alpha. Bright loops correlation between the brightness of individual loops with the amount of twist. Further investigation of the magnetic state of the loop structure requires accurate nonlinear force-free calculations.

Keywords: SOLAR PHYSICS

Type: Advances in Space Research (ISSN 0273-1177); 17; 4-5; p. (4/5)205-(4/5)208

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