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Strong coronal channelling and interplanetary evolution of a solar storm up to Earth and Mars
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The severe geomagnetic effects of solar storms or coronal mass ejections (CMEs) are to a large degree determined by their propagation direction with respect to Earth. There is a lack of understanding of the processes that determine their non-radial propagation. Here we present a synthesis of data from seven different space missions of a fast CME, which originated in an active region near the disk centre and, hence, a significant geomagnetic impact was forecasted. However, the CME is demonstrated to be channelled during eruption into a direction + 37+/-10 degree (longitude) away from its source region, leading only to minimal geomagnetic effects. In situ observations near Earth and Mars confirm the channelled CME motion, and are consistent with an ellipse shape of the CME-driven shock provided by the new Ellipse Evolution model, presented here. The results enhance our understanding of CME propagation and shape, which can help to improve space weather forecasts.
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Cited by 1 Pith paper
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Coronal dimmings and what they tell us about solar and stellar coronal mass ejections
A review of coronal dimmings that adds a new taxonomy based on the magnetic flux systems involved in eruptions, replacing the simple core/secondary morphology split.
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