行星际磁通量绳尺度的幂律谱分布

Power-law Distribution of Scale Lengths of Interplanetary Magnetic Flux Ropes

利用最小二乘法拟合了1995年1月至2001年9月Wind卫星观测到的行星际磁通量绳。根据拟合所得磁通量绳的直径,分析了行星际磁通量绳在这段时间内的发生率随磁通量绳直径D变化的关系,发现磁通量绳的发生率P(D)随直径D的变化可近似以幂律形式表示为:P(D)≈64D-0.768。行星际磁通量绳的发生率相对其直径的幂律分布表明所有行星际磁通量绳很可能是同一类现象且有共同的源,即它们都是太阳上日冕物质抛射的行星际对应物,只不过小尺度的磁通量绳对应较小的日冕物质抛射。最后,对行星际磁通量绳、日冕物质抛射和太阳耀斑的可能关系做了讨论。

Using the least squares method, we fitted the data of interplanetary magnetic flux ropes observed by the Wind Satellite from January 1995 to September 2001. Based on the diameter values resulted from the fits, we further analyzed the relation between occurrence rates P（D） of the magnetic flux ropes and their diameters, and found that the occurrence rates P（D） ≈64D^-0. 768 approximately follow a power law. This power law indicates that all the interplanetary magnetic flux ropes are the same type of phenomena and have the same source of origin, i. e. they are the interplanetary residuals of coronal mass ejections, with relatively smaller flux ropes produced by smaller solar eruptions. Finally, we discuss possible connections between interplanetary magnetic flux ropes, coronal mass ejections, and solar flares.