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arXiv 1405.6002astro-ph.SRphysics.space-ph
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探测行星际事件边界的新方法

A new approach to detect the boundaries of interplanetary events

Cristiana Dumitrache, Nedelia A. Popescu

摘要:

本文提出了一种新的方法来扫描数据,然后推断行星际日冕物质抛射的边界,特别是\emph{Ulysses}观测到的行星际事件。利用航天器测量的温度比的局部极小值,扫描和计算行星际事件的潜在边界。低等离子体β值,然后调用检测至少四个边界,两个为行星际日冕物质抛射(ICME)的开始和结束。中间边界可以被识别,如其他等离子体和磁场特征所示,这些特征标志着复杂事件的子结构。使用本文中描述的算法,我们编制了一个列表的ICME事件登记的\emph{Ulysses}航天器在2000-2002年期间,与他们的边界。经过统计分析,四个关系的等离子体β与速度,然后推断出计算的ICME,在我们的编译列表中的四个检测到的边界。为了验证该方法,我们详细分析了四个事件。该方法为\emph{Ulysses}探测器半自动探测行星际事件边界提供了前提。我们在这里还介绍了一种方法,用于可视化的磁场组件,允许检测等离子体绝缘和边界检测其他卫星太。

英文摘要:

We propose a new method to scan the data and then to infer the boundaries of the interplanetary coronal mass ejections, especially the interplanetary events observed by \emph{Ulysses}. The local minima of the temperatures ratio measured by the spacecraft are used to scan and compute the potential boundaries of the interplanetary events. The low plasma beta values are then invoked to detect at least four boundaries, two for the beginning and two for the end of an interplanetary coronal mass ejection (ICME). Intermediate boundaries can be identified, as indicated by other plasma and magnetic field signatures, and these ones mark substructures of a complex event. Using the algorithm described in this article, we have compiled a list of the ICME events registered by \emph{Ulysses} spacecraft during 2000-2002, with their boundaries. After a statistical analysis, four relationships of the plasma beta with the speed are then inferred for the computed ICMEs, for each of the four detected boundaries in our compiled list. In order to exemplify the method we analyse in detail four events. This method provides premises for an alternative way of semi-automatic detection of the interplanetary events' boundaries observed by \emph{Ulysses} spacecraft. We introduce here also a method for visualisation of the magnetic field components that allows detection of plasma insulations and boundaries detection for other satellites too.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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