A Simple Way to Estimate the Soft X-ray Class of Far-Side Solar Flares Observed with STEREO/EUVI

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• 作者：I. M. Chertok ; A. V. Belov ; V. V. Grechnev
• 关键词：STEREO ; Extreme ultraviolet ; Solar flares ; Saturation streaks ; GOES ; Soft?X ; rays
• 刊名：Solar Physics
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：290
• 期：7
• 页码：1947-1961
• 全文大小：1,918 KB
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• 作者单位：I. M. Chertok (1)
  A. V. Belov (1)
  V. V. Grechnev (2)
  
  1. Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation (IZMIRAN), Troitsk, Moscow, 142190, Russia
  2. Institute of Solar-Terrestrial Physics SB RAS, Lermontov St. 126A, Irkutsk, 664033, Russia
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Astronomy
  Extraterrestrial Physics and Space Sciences
  Astrophysics
  
• 出版者：Springer Netherlands
• ISSN：1573-093X

文摘

Around the peaks of substantial flares, bright spurious nearly horizontal saturation streaks (B-streaks) corresponding to the brightest parts of the flare sources appear in the STEREO/EUVI 195?? images. We show that the length of these B-streaks can be used to solve the problem of evaluating the soft X-ray flux and class of far-side flares that are registered with the twin STEREO spacecraft, but are invisible from Earth. For this purpose, from data on about 350 flares that were observed from January 2007 to July 2014 (mainly exceeding the GOES M1.0 level) both with GOES and STEREO, we established an empirical relation that correlates the GOES 1?–-?? peak flux and the B-streak length. This allowed us to estimate the soft X-ray classes for approximately 65 strong far-side flares observed by STEREO for the same years. The results of this simple and prompt method are consistent with the estimations of Nitta et al. (Solar Phys. 288, 241, 2013a) that were based on the calculations of the EUVI full-disk digital number output. In addition, we studied some features of the B-streaks in impulsive and long-duration flares and demonstrate that B-streaks in several consecutive EUVI images can be used to reconstruct a probable time history of strong far-side flares.