Velocity shifts in flare spectra during plasmoid ejections

被引：1

作者：

Pre, P. ^{[1
]}

Falewicz, R. ^{[1
]}

Phillips, K.J.H. ^{[2
]}

机构：

[1] Astronomical Institute of Wroclaw University, PL-51-622 Wroclaw, Poland

[2] Space Science and Technology Department, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, United Kingdom

来源：

Advances in Space Research | 2002年 / 30卷 / 03期

关键词：

Gaussian noise (electronic) - Magnetic fields - Plasmas;

D O I：

10.1016/S0273-1177(02)00356-3

中图分类号：

学科分类号：

摘要：

In some limb flares observed by Yohkoh Soft X-ray Telescope plasmoid ejections are observed. Simultaneous BCS flare spectra exhibit wavelength shifts to the red or blue sides. The shifts observed in BCS spectra cannot be explained by instrumental effects. Results of fitting show that the changes in the line profile are best described by one moving gaussian which fits most of the emission. This suggests that the line shifts are produced more likely by the main bulk of plasma seen by BCS. In our opinion the results of this analysis suggest that spectral shifts observed in Fe XXV spectra are not due to the plasmoid movement seen on SXT images, but come from the main emission kernel. Very good temporal coincidence of both effects however indicate that they are not independent. Both observed movements can be a result of magnetic field reconfiguration during the flare rise phase. © 2002 COSPAR. Published by Elsevier Science Ltd. All rights reserved.

引用

页码：641 / 645

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