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Observations of a Solar Energetic Particle Event from Inside and Outside the Coma of Comet 67P

Wellbrock, A. (författare)
Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey RH5 6NT UK; The Centre for Planetary Science at UCL/Birkbeck, Gower Street, London, WC1E 6BT UK
Jones, G. H. (författare)
Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey RH5 6NT UK; The Centre for Planetary Science at UCL/Birkbeck, Gower Street, London, WC1E 6BT UK
Dresing, N. (författare)
Department of Physics and Astronomy, Turku Collegium for Science, Medicine and Technology, University of Turku, Turku, Finland
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Coates, A. J. (författare)
Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey RH5 6NT UK; The Centre for Planetary Science at UCL/Birkbeck, Gower Street, London, WC1E 6BT UK
Wedlund, C. Simon (författare)
Space Science Institute, Austrian Academy of Sciences, Schmiedlstraße 6, AT-8042 Graz Wien, Austria
Nilsson, Hans (författare)
Luleå tekniska universitet,Rymdteknik,Swedish Institute of Space Physics, PO Box, 812, 981 28 Kiruna, Sweden
Sanchez‐Cano, B. (författare)
School of Physics and Astronomy, Planetary Science group, University of Leicester, University Road, LE1 7RH Leicester, UK
Palmerio, E. (författare)
Predictive Science Inc., San Diego, CA, 92121 USA
Turc, L. (författare)
Department of Physics, University of Helsinki, Helsinki, Finland
Myllys, M. (författare)
LPC2E, CNRS, Univ. d’Orléans, OSUC, CNES, Orléans, France
Henri, P. (författare)
Laboratoire Lagrange, Observatoire de la Côte d’Azur, Université Côte d’Azur, CNRS, Nice, France; LPC2E, CNRS, Univ. d’Orléans, OSUC, CNES, Orléans, France
Goetz, C. (författare)
ESTEC, European Space Agency, Keplerlaan 1, 2201AZ, Noordwijk, The Netherlands
Witasse, O. (författare)
ESTEC, European Space Agency, Keplerlaan 1, 2201AZ, Noordwijk, The Netherlands
Nordheim, T. A. (författare)
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
Mandt, K. (författare)
Johns Hopkins Applied Physics Laboratory, Laurel, MD, 20728 USA
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Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT UK; The Centre for Planetary Science at UCL/Birkbeck, Gower Street, London, WC1E 6BT UK Department of Physics and Astronomy, Turku Collegium for Science, Medicine and Technology, University of Turku, Turku, Finland (creator_code:org_t)
2022-11-29
2022
Engelska.
Ingår i: Journal of Geophysical Research - Space Physics. - : John Wiley & Sons. - 2169-9380 .- 2169-9402. ; 127:12
Relaterad länk:
https://doi.org/10.1...
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https://urn.kb.se/re...
https://doi.org/10.1...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • We analyze observations of an SEP event at Rosetta’s target comet 67P/Churyumov-Gerasimenko during March 6th-10th 2015. The comet was 2.15AU from the Sun, with the Rosetta spacecraft approximately 70km from the nucleus placing it deep inside the comet’s coma and allowing us to study its response. The Eastern flank of an ICME also encountered Rosetta on March 6th and 7th. Rosetta’s RPC data indicate increases in ionization rates, and cometary water group pickup ions exceeding 1keV. Increased charge exchange reactions between solar wind ions and cometary neutrals also indicate increased upstream neutral populations consistent with enhanced SEP induced surface activity. In addition, the most intense parts of the event coincide with observations interpreted as an infant cometary bow shock, indicating that the SEPs may have enhanced the formation and/or intensified the observations. These solar transient events may also have pushed the cometopause closer to the nucleus.We track and discuss characteristics of the SEP event using remote observations by SOHO, WIND and GOES at the Sun, in-situ measurements at STEREO A, Mars and Rosetta, and ENLIL modeling. Based on its relatively prolonged duration, gradual and anisotropic nature and broad angular spread in the heliosphere, we determine the main particle acceleration source to be a distant ICME which emerged from the Sun on March 6th 2015 and was detected locally in the Martian ionosphere but was never encountered by 67P directly. The ICME’s shock produced SEPs for several days which traveled to the in-situ observation sites via magnetic field line connections.

Ämnesord

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Nyckelord

Atmospheric science
Atmosfärsvetenskap

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