A Statistical Study of Gamma-Ray Emitting Solar Flares Observed with Yohkoh
A Statistical Study of Gamma-Ray Emitting Solar Flares Observed with Yohkoh
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DOI：
10.1093/pasj/57.1.211
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发表时间：
2005-01
影响因子：
2.3
通讯作者：
Y. Matsumoto;K. Makishima;J. Kotoku;M. Yoshimori;K. Suga;T. Kosugi;S. Masuda;K. M. D. O. Physics-K.-M.-D.-O.-Ph
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文献类型：
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作者：
Y. Matsumoto;K. Makishima;J. Kotoku;M. Yoshimori;K. Suga;T. Kosugi;S. Masuda;K. M. D. O. Physics-K.-M.-D.-O.-Ph
从统计的角度分析了Yohkoh观测到的太阳γ射线耀斑。使用Yohkoh机载硬X射线望远镜拍摄的四波段硬X射线（15- 95 keV）光度数据与使用γ射线光谱仪获得的分光光度γ射线（0.2- 30 MeV）数据结合使用。GOES类也被纳入。从1991年10月至2001年12月观测到的2788个X射线耀斑中，选择了178个具有强硬X射线发射的事件。其中，40个耀斑进一步发现了显着的伽马射线发射。对40个耀斑的分维分析和多波段彩色-彩色图表明，它们的软X射线-MeV γ射线谱能量分布至少涉及四个独立的参数。这些是：（1）总体耀斑大小;（2）热信号与非热信号的相对强度;（3）伽马射线与硬X射线强度比;以及（4）硬X射线光谱斜率。这些结果进行检查可能的选择效果。此外，第三个参数的含义进行了简要的考虑。
Gamma-ray emitting solar flares observed with Yohkoh were analyzed from a statistical viewpoint. The four-band hard X-ray (15--95 keV) photometric data, taken with the Hard X-ray Telescope onboard Yohkoh, were utilized in combination with the spectro-photometric gamma-ray (0.2--30 MeV) data obtained with the Gamma-Ray Spectrometer. The GOES class was also incorporated. Out of 2788 X-ray flares observed from 1991 October to 2001 December, 178 events with strong hard X-ray emission were selected. Among them, 40 flares were further found to show significant gamma-ray emission. A fractal dimension analysis and multi-band color--color plots of the 40 flares suggest that their soft X-ray to MeV gamma-ray spectral energy distributions involve at least four independent parameters. These are: (1) the overall flare size; (2) the relative intensities of the thermal vs. non-thermal signals; (3) the gamma-ray to hard X-ray intensity ratio; and (4) the hard X-ray spectral slope. These results are examined for possible selection effects. Also, the meanings of the third parameter are briefly considered.