title: Strong coronal channelling and interplanetary evolution of a solar storm up to Earth and Mars.
abstract: 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° (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.
authors.affiliation: 1] Space Research Institute, Austrian Academy of Sciences, A-8042 Graz, Austria [2] IGAM-Kanzelhöhe Observatory, Institute of Physics, University of Graz, A-8010 Graz, Austria.
authors.forename: Christian
authors.initials: C
authors.lastname: Möstl
authors.affiliation: Space Research Institute, Austrian Academy of Sciences, A-8042 Graz, Austria.
authors.forename: Tanja
authors.initials: T
authors.lastname: Rollett
authors.affiliation: Southwest Research Institute, 6220 Culebra Road, San Antonio, Texas 78238, USA.
authors.forename: Rudy A
authors.initials: RA
authors.lastname: Frahm
authors.affiliation: State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Ying D
authors.initials: YD
authors.lastname: Liu
authors.affiliation: Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking RH5 6NT, UK.
authors.forename: David M
authors.initials: DM
authors.lastname: Long
authors.affiliation: Space Science Division, Naval Research Laboratory, Washington, District of Columbia 20375, USA.
authors.forename: Robin C
authors.initials: RC
authors.lastname: Colaninno
authors.affiliation: IGAM-Kanzelhöhe Observatory, Institute of Physics, University of Graz, A-8010 Graz, Austria.
authors.forename: Martin A
authors.initials: MA
authors.lastname: Reiss
authors.affiliation: IGAM-Kanzelhöhe Observatory, Institute of Physics, University of Graz, A-8010 Graz, Austria.
authors.forename: Manuela
authors.initials: M
authors.lastname: Temmer
authors.affiliation: Space Science Center, Department of Physics, University of New Hampshire, Durham, New Hampshire 03824, USA.
authors.forename: Charles J
authors.initials: CJ
authors.lastname: Farrugia
authors.affiliation: NASA Headquarters, Washington, District of Columbia 20546, USA.
authors.forename: Arik
authors.identifier: 0000000315728734
authors.initials: A
authors.lastname: Posner
authors.affiliation: Hvar Observatory, Faculty of Geodesy, University of Zagreb, 10 000 Zagreb, Croatia.
authors.forename: Mateja
authors.initials: M
authors.lastname: Dumbović
authors.affiliation: Department of Mathematics, University of Dundee, Dundee DD1 4HN, Scotland.
authors.forename: Miho
authors.initials: M
authors.lastname: Janvier
authors.affiliation: Observatoire de Paris, LESIA, UMR 8109 (CNRS), F-92195 Meudon Principal, France.
authors.forename: Pascal
authors.initials: P
authors.lastname: Démoulin
authors.affiliation: IGAM-Kanzelhöhe Observatory, Institute of Physics, University of Graz, A-8010 Graz, Austria.
authors.forename: Peter
authors.initials: P
authors.lastname: Boakes
authors.affiliation: Solar-Terrestrial Center of Excellence - SIDC, Royal Observatory of Belgium, 1180 Brussels, Belgium.
authors.forename: Andy
authors.initials: A
authors.lastname: Devos
authors.affiliation: Solar-Terrestrial Center of Excellence - SIDC, Royal Observatory of Belgium, 1180 Brussels, Belgium.
authors.forename: Emil
authors.initials: E
authors.lastname: Kraaikamp
authors.affiliation: 1] Catholic University of America, Washington, District of Columbia 20064, USA [2] Heliophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.
authors.forename: Mona L
authors.initials: ML
authors.lastname: Mays
authors.affiliation: Hvar Observatory, Faculty of Geodesy, University of Zagreb, 10 000 Zagreb, Croatia.
authors.forename: Bojan
authors.initials: B
authors.lastname: Vršnak