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arXiv 2006.14879astro-ph.SRphysics.space-ph
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日球层中的日冕物质抛射:III。STEREO/HI-1 2008 - 2014年在日光层探测到的CME的立体几何建模技术导出的运动学特性的统计分析

CMEs in the Heliosphere: III. A Statistical Analysis of the Kinematic Properties Derived from Stereoscopic Geometrical Modelling Techniques Applied to CMEs Detected in the Heliosphere from 2008 to 2014 by STEREO/HI-1

D. Barnes, J. A. Davies, R. A. Harrison, J. P. Byrne, C. H. Perry, V. Bothmer, J. P. Eastwood, P. T. Gallagher, E. K. J. Kilpua, C. Möstl, L. Rodriguez, A. P. R… 展开作者

D. Barnes, J. A. Davies, R. A. Harrison, J. P. Byrne, C. H. Perry, V. Bothmer, J. P. Eastwood, P. T. Gallagher, E. K. J. Kilpua, C. Möstl, L. Rodriguez, A. P. Rouillard, D. Odstrcil

摘要:

我们提出了一个分析的日冕物质抛射(CME)所观察到的日光层成像仪(HI)上的美国宇航局的日地关系天文台(STEREO)航天器。在2008年8月至2014年4月期间,我们确定了两个航天器上的HI同时观测到的273个CME。对于每个CME,我们跟踪观察到的前缘,作为时间的函数,从两个有利位置,并应用立体自相似扩展(SSSE)技术来推断它们在整个内日光层的传播。当观测到的CME前缘在航天器之间通过时,该技术无法准确定位CME,然而,我们能够成功地将该技术应用于151,其中大多数发生在航天器分离角超过180度时,在太阳活动最大期。我们发现,使用一个小的半宽度,以适应CME可能会导致观察到的加速到非物理的高速度,使用较大的半宽度可能无法准确地定位CME靠近太阳,因为该方法不占CME过度膨胀在这个地区。SSSE观测到的速度一致,以及与单航天器(SSEF)的分析技术应用于相同的事件。来自SSSE和SSEF分析CME传播方向同意差,因为已知的限制存在于后者。这项工作是作为欧盟FP 7 HELCATS(日光层编目、分析和技术服务)项目(http://www.helcats-fp7.eu/)的一部分进行的。

英文摘要:

We present an analysis of coronal mass ejections (CMEs) observed by the Heliospheric Imagers (HIs) on board NASA's Solar Terrestrial Relations Observatory (STEREO) spacecraft. Between August 2008 and April 2014 we identify 273 CMEs that are observed simultaneously, by the HIs on both spacecraft. For each CME, we track the observed leading edge, as a function of time, from both vantage points, and apply the Stereoscopic Self-Similar Expansion (SSSE) technique to infer their propagation throughout the inner heliosphere. The technique is unable to accurately locate CMEs when their observed leading edge passes between the spacecraft, however, we are able to successfully apply the technique to 151, most of which occur once the spacecraft separation angle exceeds 180 degrees, during solar maximum. We find that using a small half-width to fit the CME can result in observed acceleration to unphysically high velocities and that using a larger half-width can fail to accurately locate the CMEs close to the Sun because the method does not account for CME over-expansion in this region. Observed velocities from SSSE are found to agree well with single-spacecraft (SSEF) analysis techniques applied to the same events. CME propagation directions derived from SSSE and SSEF analysis agree poorly because of known limitations present in the latter. This work was carried out as part of the EU FP7 HELCATS (Heliospheric Cataloguing, Analysis and Techniques Service) project (http://www.helcats-fp7.eu/).

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