This study compares flare source volumes inferred from impulsive hard X-rays and microwaves with those derived from density sensitive soft X-ray line ratios in the O VII spectrum. The data for this study were obtained with the SMM Hard X-Ray Burst Spectrometer, Earth-based radio observatories, and the SOLEX-B spectrometer on the P78-1 satellite. Data were available for the flares of 1980 April 8, 1980 May 9, and 1981 February 26. The hard X-ray/microwave source volume is determined under the assumption that the same electron temperature or power law index characterizes both the source of hard X-rays and the source of microwaves. The O VII line ratios yield the density and volume of the 2 X 10 to the 6th K plasma. For all three flares, the O VII source volume is found to be smallest at the beginning of the flare, near the time when the impulsive hard X-ray/microwave volume reaches its first maximum. At this time, the O VII volume is three to four orders of magnitude smaller than that inferred from the hard X-ray/microwave analysis. Subsequently, the O VII source volume increases by one or two orders of magnitude then remains almost constant until the end of the flare when it apparently increases again.
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机译:这项研究比较了从脉冲硬X射线和微波推断出的火炬源体积与从O VII光谱中密度敏感的软X射线线比得出的火炬源体积。这项研究的数据是通过SMM硬X射线爆裂光谱仪,地基无线电台和P78-1卫星上的SOLEX-B光谱仪获得的。可获得1980年4月8日,1980年5月9日和1981年2月26日的耀斑的数据。硬X射线/微波源的体积是在相同的电子温度或幂定律指数表征硬X的源的前提下确定的射线和微波源。 O VII线比产生2 X 10到第6 K等离子体的密度和体积。对于所有三个耀斑,发现在爆炸开始时O VII源体积最小,接近脉冲硬X射线/微波体积达到其第一最大值的时间。此时,O VII的体积比硬X射线/微波分析推断的体积小三到四个数量级。随后,O VII源体积增加一到两个数量级,然后保持几乎恒定,直到火炬结束,而火炬又明显增加。
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