Assessing the Effect of Spacecraft Motion on Single-Spacecraft Solar Wind Tracking Techniques
Assessing the Effect of Spacecraft Motion on Single-Spacecraft Solar Wind Tracking Techniques
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DOI：
10.1007/s11207-014-0549-z
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发表时间：
2014-05
期刊：
影响因子：
2.8
通讯作者：
T. Conlon;S. Milan;J. Davies
中科院分区：
文献类型：
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作者：
T. Conlon;S. Milan;J. Davies
科里奥利航天器上的太阳质量喷射成像仪（SMEI）和最近美国宇航局日地关系天文台（STEREO）上的日光层成像仪（HI）在广角成像方面的最新进展，使太阳风瞬态成像和跟踪从太阳到1 Au和更远。在本文中，我们考虑两种技术，已被用来确定传播特性的太阳风瞬变的基础上单航天器的观测，特别是传播方向和径向速度。这些技术通常假定观测航天器在观测太阳风瞬变期间保持静止。我们确定的不准确性，这两个立体声航天器的假设，并发现它可以是显着的，它可能会导致高估的瞬时速度，从立体声-A和低估的立体声-B。这对预测1 Au处的太阳风瞬变具有意义，因此对空间天气的研究具有重要意义。
Recent advances in wide-angle imaging by theSolar Mass Ejection Imager(SMEI) on board theCoriolisspacecraft and more recently by theHeliospheric Imagers(HI) aboard NASA’sSolar TErrestrial RElations Observatory(STEREO), have enabled solar wind transients to be imaged and tracked from the Sun to 1 AU and beyond. In this paper we consider two of the techniques that have been used to determine the propagation characteristics of solar wind transients based on single-spacecraft observations, in particular propagation direction and radial speed. These techniques usually assume that the observing spacecraft remains stationary for the duration of observation of the solar wind transient. We determine the inaccuracy introduced by this assumption for the two STEREO spacecraft and find that it can be significant, and it can lead to an overestimation of the transient velocity as seen from STEREO-A and an underestimation as seen by STEREO-B. This has implications for the prediction or solar wind transients at 1 AU and hence is important for the study of space weather.