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Energetic ions in the Venusian system: Insights from the first Solar Orbiter flyby
Johns Hopkins Appl Phys Lab, Laurel, MD 20723 USA..
Univ Alcala De Henares, Space Res Grp, Madrid, Spain..
Christian Albrechts Univ Kiel, Inst Expt & Angewande Phys, D-24118 Kiel, Germany..
Christian Albrechts Univ Kiel, Inst Expt & Angewande Phys, D-24118 Kiel, Germany..
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2021 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 656, article id A7Article in journal (Refereed) Published
Abstract [en]

The Solar Orbiter flyby of Venus on 27 December 2020 allowed for an opportunity to measure the suprathermal to energetic ions in the Venusian system over a large range of radial distances to better understand the acceleration processes within the system and provide a characterization of galactic cosmic rays near the planet. Bursty suprathermal ion enhancements (up to similar to 10 keV) were observed as far as similar to 50R(V) downtail. These enhancements are likely related to a combination of acceleration mechanisms in regions of strong turbulence, current sheet crossings, and boundary layer crossings, with a possible instance of ion heating due to ion cyclotron waves within the Venusian tail. Upstream of the planet, suprathermal ions are observed that might be related to pick-up acceleration of photoionized exospheric populations as far as 5R(V) upstream in the solar wind as has been observed before by missions such as Pioneer Venus Orbiter and Venus Express. Near the closest approach of Solar Orbiter, the Galactic cosmic ray (GCR) count rate was observed to decrease by approximately 5 percent, which is consistent with the amount of sky obscured by the planet, suggesting a negligible abundance of GCR albedo particles at over 2 R-V. Along with modulation of the GCR population very close to Venus, the Solar Orbiter observations show that the Venusian system, even far from the planet, can be an effective accelerator of ions up to similar to 30 keV. This paper is part of a series of the first papers from the Solar Orbiter Venus flyby.

Place, publisher, year, edition, pages
EDP Sciences EDP Sciences, 2021. Vol. 656, article id A7
Keywords [en]
acceleration of particles, planets and satellites, terrestrial planets, planet-star interactions, planetary systems, turbulence, waves
National Category
Astronomy, Astrophysics and Cosmology Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-464272DOI: 10.1051/0004-6361/202140803ISI: 000730246400013OAI: oai:DiVA.org:uu-464272DiVA, id: diva2:1630049
Funder
Swedish National Space BoardSwedish National Space Board, 2020-00111Available from: 2022-01-19 Created: 2022-01-19 Last updated: 2024-01-15Bibliographically approved

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Khotyaintsev, Yuri V.Dimmock, Andrew P.Sorriso-Valvo, LucaStergiopoulou, KaterinaVaivads, Andris

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Khotyaintsev, Yuri V.Dimmock, Andrew P.Sorriso-Valvo, LucaStergiopoulou, KaterinaVaivads, Andris
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