uu.seUppsala University Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • 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
Evaluating Local Ionization Balance in the Nightside Martian Upper Atmosphere during MAVEN Deep Dip Campaigns
Sun Yat Sen Univ, Sch Atmospher Sci, Zhuhai, Guangdong, Peoples R China;Chinese Acad Sci, Natl Astron Observ, Key Lab Lunar & Deep Space Explorat, Beijing, Peoples R China;Chinese Acad Sci, Ctr Excellence Comparat Planetol, Hefei, Anhui, Peoples R China.
Chinese Acad Sci, Natl Astron Observ, Key Lab Lunar & Deep Space Explorat, Beijing, Peoples R China.
Chinese Acad Sci, Natl Astron Observ, Key Lab Lunar & Deep Space Explorat, Beijing, Peoples R China;Chinese Acad Sci, Ctr Excellence Comparat Planetol, Hefei, Anhui, Peoples R China.
Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA.
Show others and affiliations
2019 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 876, no 1, article id L12Article in journal (Refereed) Published
Abstract [en]

Combining the Mars Atmosphere and Volatile Evolution (MAVEN) measurements of atmospheric neutral and ion densities, electron temperature, and energetic electron intensity, we perform the first quantitative evaluation of local ionization balance in the nightside Martian upper atmosphere, a condition with the electron impact ionization (EI) of CO2 exactly balanced by the dissociative recombination (DR) of ambient ions. The data accumulated during two MAVEN Deep Dip (DD) campaigns are included: DD6 on the deep nightside with a periapsis solar zenith angle (SZA) of 165 degrees, and DD3 close to the dawn terminator with a periapsis SZA of 110 degrees. With the electron temperatures at low altitudes corrected for an instrumental effect pertaining to the MAVEN Langmuir Probe and Waves, a statistical agreement between the EI and DR rates is suggested by the data below 140 km during DD6 and below 180 km during DD3, implying that electron precipitation is responsible for the nightside Martian ionosphere under these circumstances and extra sources are not required. In contrast, a substantial enhancement in EI over DR is observed at higher altitudes during both campaigns, which we interpret as a signature of plasma escape down the tail.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2019. Vol. 876, no 1, article id L12
Keywords [en]
planets and satellites: atmospheres, planets and satellites: individual (Mars)
National Category
Fusion, Plasma and Space Physics Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-383845DOI: 10.3847/2041-8213/ab1b34ISI: 000466902900002OAI: oai:DiVA.org:uu-383845DiVA, id: diva2:1318025
Funder
Swedish Research Council, 621-2013-4191Swedish National Space Board, 135/13Swedish National Space Board, 166/14Available from: 2019-05-24 Created: 2019-05-24 Last updated: 2019-05-24Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full text

Authority records BETA

Vigren, ErikEdberg, Niklas J. T.

Search in DiVA

By author/editor
Vigren, ErikEdberg, Niklas J. T.
By organisation
Swedish Institute of Space Physics, Uppsala Division
In the same journal
Astrophysical Journal Letters
Fusion, Plasma and Space PhysicsAstronomy, Astrophysics and Cosmology

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 2 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • 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