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Solar Physics

, Volume 289, Issue 10, pp 3935–3947

First Online: 17 May 2014Received: 25 November 2013Accepted: 30 April 2014


Recent advances in wide-angle imaging by the Solar Mass Ejection Imager SMEI on board the Coriolis spacecraft and more recently by the Heliospheric Imagers HI aboard NASA’s Solar 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.

KeywordsCoronal mass ejections Corotating interaction regions Solar wind  Download fulltext PDF

Autor: T. M. Conlon - S. E. Milan - J. A. Davies


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