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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
European Space Agcy, ESTEC.
Univ Leicester, Dept Phys & Astron, Radio & Space Plasma Phys Grp.
NASA Goddard Space Flight Ctr, Heliophys Sci Div.
Univ Nacl Autonoma Mexico, Inst Geofis.
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2017 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 122, no 8, p. 7865-7890Article in journal (Refereed) Published
Abstract [en]

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, Mars Atmosphere and Volatile EvolutioN Mission (MAVEN), Mars Odyssey, and Mars Science Laboratory (MSL) missions, 44h 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 9.9AU. 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 nonambiguous signature at New Horizons. A potential detection of this ICME by Voyager 2 at 110-111 AU is also discussed. The multispacecraft observations allow the derivation of certain properties of the ICME, such as its large angular extension of at least 116 degrees, 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.

Place, publisher, year, edition, pages
2017. Vol. 122, no 8, p. 7865-7890
Keywords [en]
interplanetary coronal mass ejection, Forbush decrease, Mars, comet 67P, Saturn, New Horizons
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-336648DOI: 10.1002/2017JA023884ISI: 000411788800002OAI: oai:DiVA.org:uu-336648DiVA, id: diva2:1166639
Funder
Swedish National Space Board, 135/13Swedish Research Council, 621-2013-4191Available from: 2017-12-15 Created: 2017-12-15 Last updated: 2017-12-15Bibliographically approved

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Opgenoorth, HermannRamstad, R.Nilsson, H.Edberg, Niklas J. T.Andrews, David J.
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Swedish Institute of Space Physics, Uppsala Division
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