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| Title: | TRANSVERSAL AND RADIAL MOTIONS
OF FLARING KERNELS FOR 11 AUGUST 1992 EVENT |
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| Authors: | J. Sylwester and B. Sylwester | |
| Abstract: | We have studied time variations of the maximum brightness location for pronounced flare emission kernel seen on deconvolved Yohkoh Soft X-ray Telescope images for 11 August 1992 10:25 UT event. Derived patterns of maximum brightness displacements as observed on Al01, Al12 and Be119 filter images have been intercompared. In addition, we have incorporated into the analysis the MEM-reconstructed Hard X-ray Telescope images and the data from the SXT aspect sensor. The analysis of the data reveals systematic variation of the brightest source position seen in the coronal portion of the active region, close to the eastern limb. This variations can be followed in all considered energy bands. Derived displacement pattern indicates for presence of striking similarities and/or differences. We relate the observed transversal kernels' location with Doppler displacements (radial velocity component) as determined from analysis of soft X-ray spectra obtained by Yohkoh Bent Crystal Spectrometer (BCS). Thanks to a new approach, we were able to study line shifts and widths early in the flare evolution, even before the maximum of the impulsive hard X-ray phase. We notice presence of relationship between transversal motion of the brightest kernel (as determined from SXT images) and the radial displacement (as determined from time-integrated Doppler Ca XIX w line shifts). This observation represents unique argument in favour of the dynamic nature of the observed transversal motion of flaring kernel. We identify the moving kernel as the source of Ca XIX and SXT emission. |
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| Figures: | Fig1. ps. gz (46k) |
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