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Why an intrinsic ma...
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Gunell, HerbertUmeå universitet,Institutionen för fysik,Royal Belgian Institute for Space Aeronomy (BIRA-IASB), Belgium
(author)
Why an intrinsic magnetic field does not protect a planet against atmospheric escape
- Article/chapterEnglish2018
Publisher, publication year, extent ...
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2018-06-21
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EDP Sciences,2018
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electronicrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:umu-148205
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https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-148205URI
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https://doi.org/10.1051/0004-6361/201832934DOI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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The presence or absence of a magnetic field determines the nature of how a planet interacts with the solar wind and what paths are available for atmospheric escape. Magnetospheres form both around magnetised planets, such as Earth, and unmagnetised planets, like Mars and Venus, but it has been suggested that magnetised planets are better protected against atmospheric loss. However, the observed mass escape rates from these three planets are similar (in the approximate (0.5–2) kg s−1 range), putting this latter hypothesis into question. Modelling the effects of a planetary magnetic field on the major atmospheric escape processes, we show that the escape rate can be higher for magnetised planets over a wide range of magnetisations due to escape of ions through the polar caps and cusps. Therefore, contrary to what has previously been believed, magnetisation is not a sufficient condition for protecting a planet from atmospheric loss. Estimates of the atmospheric escape rates from exoplanets must therefore address all escape processes and their dependence on the planet’s magnetisation.
Subject headings and genre
Added entries (persons, corporate bodies, meetings, titles ...)
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Maggiolo, RomainRoyal Belgian Institute for Space Aeronomy (BIRA-IASB), Belgium
(author)
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Nilsson, HansSwedish Institute of Space Physics, Kiruna, Sweden(Swepub:umu)hani0062
(author)
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Stenberg Wieser, GabriellaSwedish Institute of Space Physics, Kiruna, Sweden
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Slapak, RikardEISCAT Scientific Association, Kiruna, Sweden
(author)
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Lindkvist, Jesper,1986-Umeå universitet,Institutionen för fysik(Swepub:umu)jeli0142
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Hamrin, Maria,1972-Umeå universitet,Institutionen för fysik(Swepub:umu)maha0006
(author)
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De Keyser, JohanRoyal Belgian Institute for Space Aeronomy (BIRA-IASB), Belgium
(author)
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Umeå universitetInstitutionen för fysik
(creator_code:org_t)
Related titles
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In:Astronomy and Astrophysics: EDP Sciences6140004-63611432-0746
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