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

Witasse, Olivier and Sánchez-Cano, Beatriz and Mays, M. L. and Kajdič, P. and Opgenoorth, Hermann and Elliott, H. A. and Richardson, I. G. and Zouganelis, I. and Zender, J. and Wimmer-Schweingruber, R. F. and Turc, L. and Taylor, M. G. G. T. and Roussos, E. and Rouillard, A. and Richter, I. and Richardson, J. D. and Ramstad, R. and Provan, G. and Posner, A. and Plaut, J. J. and Odstrcil, D. and Nilsson, H. and Niemenen, P. and Milan, S. E. and Mandt, K. and Lohf, H. and Lester, Mark and Lebreton, J.-P. and Kuulkers, E. and Krupp, N. and Koenders, C. and James, M. K. and Intzekara, D. and Holmstrom, Mats and Hassler, D. M. and Hall, B. E. S. and Guo, J. and Goldstein, R. and Goetz, C. and Glassmeier, K. H. and Génot, V. and Evans, H. and Espley, J. and Edberg, Niklas and Dougherty, M. and Cowley, S. W. H. and Burch, J. and Behar, E. and Barabash, Stas and Andrews, David and Altobelli, N. (2017) 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. Journal of Geophysical Research: Space Physics, 122 (8). pp. 7865-7890. ISSN 2169-9380

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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.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Geophysical Research: Space Physics
Additional Information:
©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.
Subjects:
ID Code:
86976
Deposited By:
Deposited On:
21 Jul 2017 12:22
Refereed?:
Yes
Published?:
Published
Last Modified:
25 Sep 2020 03:11