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Evaluating Local Io...
Evaluating Local Ionization Balance in the Nightside Martian Upper Atmosphere during MAVEN Deep Dip Campaigns
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- Cui, J. (författare)
- 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
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- Cao, Y-T (författare)
- Chinese Acad Sci, Natl Astron Observ, Key Lab Lunar & Deep Space Explorat, Beijing, Peoples R China
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- Wu, X-S (författare)
- 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
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- Xu, S-S (författare)
- Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA
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Yelle, R. , V (författare)
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- Stone, S. (författare)
- Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA
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- Vigren, Erik (författare)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Edberg, Niklas J. T. (författare)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Shen, C-L (författare)
- Chinese Acad Sci, Ctr Excellence Comparat Planetol, Hefei, Anhui, Peoples R China;Univ Sci & Technol China, Sch Earth & Space Sci, Hefei, Anhui, Peoples R China
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- He, F. (författare)
- Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
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- Wei, Y. (författare)
- Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
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(creator_code:org_t)
- 2019-05-03
- 2019
- Engelska.
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Ingår i: Astrophysical Journal Letters. - : IOP PUBLISHING LTD. - 2041-8205 .- 2041-8213. ; 876:1
- Relaterad länk:
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https://iopscience.i...
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https://urn.kb.se/re...
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https://doi.org/10.3...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- planets and satellites: atmospheres
- planets and satellites: individual (Mars)
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Cui, J.
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Cao, Y-T
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Wu, X-S
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Xu, S-S
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Yelle, R. , V
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Stone, S.
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visa fler...
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Vigren, Erik
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Edberg, Niklas J ...
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Shen, C-L
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He, F.
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Wei, Y.
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visa färre...
- Om ämnet
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- NATURVETENSKAP
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NATURVETENSKAP
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och Fysik
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och Fusion plasma oc ...
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- NATURVETENSKAP
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NATURVETENSKAP
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och Fysik
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och Astronomi astrof ...
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Astrophysical Jo ...
- Av lärosätet
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Uppsala universitet