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  • Witasse_et_al-2017-Journal_of_Geophysical_Research-_Space_Physics

    Rights statement: Accepted for publication in Journal of Geophysical Research (Space Physics). Copyright 2017. American Geophysical Union. Further reproduction or electronic distribution is not permitted.

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  • Witasse_et_al-2017-Journal_of_Geophysical_Research-_Space_Physics

    Rights statement: ©2017. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

    Final published version, 5 MB, PDF-document

    Available under license: CC BY: Creative Commons Attribution 4.0 International License

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Interplanetary coronal mass ejection observed at STEREO-A, Mars, comet 67P/Churyumov-Gerasimenko, Saturn, and New Horizons en-route to Pluto. Comparison of its Forbush decreases at 1.4, 3.1 and 9.9 AU: Interplanetary coronal mass ejection

Research output: Contribution to journalJournal article

Published
  • Olivier Witasse
  • Beatriz Sánchez-Cano
  • M. L. Mays
  • P. Kajdič
  • Hermann Opgenoorth
  • H. A. Elliott
  • I. G. Richardson
  • I. Zouganelis
  • J. Zender
  • R. F. Wimmer-Schweingruber
  • L. Turc
  • M. G. G. T. Taylor
  • E. Roussos
  • A. Rouillard
  • I. Richter
  • J. D. Richardson
  • R. Ramstad
  • G. Provan
  • A. Posner
  • J. J. Plaut
  • D. Odstrcil
  • H. Nilsson
  • P. Niemenen
  • S. E. Milan
  • K. Mandt
  • H. Lohf
  • Mark Lester
  • J.-P. Lebreton
  • E. Kuulkers
  • N. Krupp
  • C. Koenders
  • M. K. James
  • D. Intzekara
  • Mats Holmstrom
  • D. M. Hassler
  • J. Guo
  • R. Goldstein
  • C. Goetz
  • K. H. Glassmeier
  • V. Génot
  • H. Evans
  • J. Espley
  • Niklas Edberg
  • M. Dougherty
  • S. W. H. Cowley
  • J. Burch
  • E. Behar
  • Stas Barabash
  • David Andrews
  • N. Altobelli
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<mark>Journal publication date</mark>08/2017
<mark>Journal</mark>Journal of Geophysical Research: Space Physics
Issue number8
Volume122
Number of pages26
Pages (from-to)7865-7890
StatePublished
Early online date23/06/17
Original languageEnglish

Abstract

We discuss observations of the journey throughout the Solar System of a large interplanetary coronal mass ejection (ICME) that was ejected at the Sun on 14 October 2014. The ICME hit Mars on 17 October, as observed by the Mars Express, MAVEN, Mars Odyssey and MSL missions, 44 hours before the encounter of the planet with the Siding-Spring comet, for which the space weather context is provided. It reached comet 67P/Churyumov-Gerasimenko, which was perfectly aligned with the Sun and Mars at 3.1 AU, as observed by Rosetta on 22 October. The ICME was also detected by STEREO-A on 16 October at 1 AU, and by Cassini in the solar wind around Saturn on the 12 November at 9.9 AU. Fortuitously, the New Horizons spacecraft was also aligned with the direction of the ICME at 31.6 AU. We investigate whether this ICME has a non-ambiguous signature at New Horizons. A potential detection of this ICME by Voyager-2 at 110-111 AU is also discussed. The multi-spacecraft observations allow the derivation of certain properties of the ICME, such as its large angular extension of at least 116°, its speed as a function of distance, and its magnetic field structure at four locations from 1 to 10 AU. Observations of the speed data allow two different solar wind propagation models to be validated. Finally, we compare the Forbush decreases (transient decreases followed by gradual recoveries in the galactic cosmic ray intensity) due to the passage of this ICME at Mars, comet 67P and Saturn.

Bibliographic note

©2017. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.