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Solar Orbiter's encounter with the tail of comet C/2019 Y4 (ATLAS): Magnetic field draping and cometary pick-up ion waves
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SYSNO ASEP 0552618 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Solar Orbiter's encounter with the tail of comet C/2019 Y4 (ATLAS): Magnetic field draping and cometary pick-up ion waves Author(s) Matteini, L. (GB)
Laker, R. (GB)
Horbury, T. (GB)
Štverák, Štěpán (ASU-R) RID, ORCID
Trávníček, P. (US)Number of authors 39 Article number A39 Source Title Astronomy & Astrophysics. - : EDP Sciences - ISSN 0004-6361
Roč. 656, December (2021)Number of pages 13 s. Publication form Online - E Language eng - English Country FR - France Keywords solar wind ; comets ; C/2019 Y4 ATLAS Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics OECD category Astronomy (including astrophysics,space science) Method of publishing Open access with time embargo (01.01.2023) Institutional support ASU-R - RVO:67985815 UT WOS 000730246400011 EID SCOPUS 85121621282 DOI 10.1051/0004-6361/202141229 Annotation This study is aimed at identifying possible signatures of the interaction of the solar wind plasma with material released by comet ATLAS, including the detection of draped magnetic field as well as the presence of cometary pick-up ions and of ion-scale waves excited by associated instabilities. This encounter provides us with the first opportunity of addressing such dynamics in the inner Heliosphere and improving our understanding of the plasma interaction between comets and the solar wind. We analysed data from all in situ instruments on board Solar Orbiter and compared their independent measurements in order to identify and characterize the nature of structures and waves observed in the plasma when the encounter was predicted. We identified a magnetic field structure observed at the start of 4 June, associated with a full magnetic reversal, a local deceleration of the flow and large plasma density, and enhanced dust and energetic ions events. The cross-comparison of all these observations support a possible cometary origin for this structure and suggests the presence of magnetic field draping around some low-field and high-density object. Inside and around this large scale structure, several ion-scale wave-forms are detected that are consistent with small-scale waves and structures generated by cometary pick-up ion instabilities. Workplace Astronomical Institute Contact Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2022 Electronic address https://doi.org/10.1051/0004-6361/202141229
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