umu.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Why an intrinsic magnetic field does not protect a planet against atmospheric escape
Umeå University, Faculty of Science and Technology, Department of Physics. Royal Belgian Institute for Space Aeronomy (BIRA-IASB), Belgium.
Royal Belgian Institute for Space Aeronomy (BIRA-IASB), Belgium.
Swedish Institute of Space Physics, Kiruna, Sweden.
Swedish Institute of Space Physics, Kiruna, Sweden.
Show others and affiliations
2018 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 614, article id L3Article in journal, Letter (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2018. Vol. 614, article id L3
Keywords [en]
Planets and satellites: magnetic fields, Planets and satellites: atmospheres, plasmas
National Category
Fusion, Plasma and Space Physics
Research subject
Space and Plasma Physics; Space Physics
Identifiers
URN: urn:nbn:se:umu:diva-148205DOI: 10.1051/0004-6361/201832934ISI: 000435753000001Scopus ID: 2-s2.0-85049562755OAI: oai:DiVA.org:umu-148205DiVA, id: diva2:1211137
Available from: 2018-05-30 Created: 2018-05-30 Last updated: 2018-11-26Bibliographically approved

Open Access in DiVA

fulltext(3646 kB)60 downloads
File information
File name FULLTEXT01.pdfFile size 3646 kBChecksum SHA-512
7f00e106555484c797092c595d0b58a09bcf6d30d0d787477a3cb1bd7ee3755ea296c0f9aa9f8b49c5c5a02c268b56b766ddaf669c20db5a5b9a2ab530b16a85
Type fulltextMimetype application/pdf

Other links

Publisher's full textScopus

Authority records BETA

Nilsson, HansLindkvist, JesperHamrin, Maria

Search in DiVA

By author/editor
Nilsson, HansLindkvist, JesperHamrin, Maria
By organisation
Department of Physics
In the same journal
Astronomy and Astrophysics
Fusion, Plasma and Space Physics

Search outside of DiVA

GoogleGoogle Scholar
Total: 60 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 164 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf