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The tailward flow o...
The tailward flow of energetic neutral atoms observed at Mars
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Galli, André (author)
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Wurz, Peter (author)
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Kallio, Esa (author)
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- Ekenbäck, Andreas (author)
- Institutet för rymdfysik (IRF)
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- Holmström, Mats (author)
- Institutet för rymdfysik, Kiruna
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- Barabash, Stas (author)
- Institutet för rymdfysik, Kiruna
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Gregoriev, Alexander (author)
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- Futaana, Yoshifumi (author)
- Institutet för rymdfysik, Kiruna
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Fok, Mei-Ching (author)
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Gunell, H (author)
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(creator_code:org_t)
- Washington : American Geophysical Union (AGU), 2008
- 2008
- English.
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In: Journal of Geophysical Research. - Washington : American Geophysical Union (AGU). - 0148-0227 .- 2156-2202. ; 113
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- The ASPERA-3 experiment on Mars Express provides the first measurements of energetic neutral atoms (ENAs) from Mars. These measurements are used to study the global structure of the interaction of the solar wind with the Martian atmosphere. In this study we describe the tailward ENA flow observed at the nightside of Mars. After characterizing energy spectra of hydrogen ENA signals, we present composite images of the ENA intensities and compare them to theoretical predictions (empirical and MHD models). We find that the tailward flow of hydrogen ENAs is mainly generated by shocked solar wind protons. Despite intensive search, no oxygen ENAs above the instrument threshold are detected. The results challenge existing plasma models and constrain the hydrogen exospheric densities and atmospheric hydrogen and oxygen loss rates at low solar activity.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geofysik (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geophysics (hsv//eng)
Keyword
- solar-wind interaction
- subsolar ENA jet
- 1st-ENA observations
- Aspera-3 observations
- upper atmosphere
- charge-exchange
- express mission
- space plasmas
- hydrogen
- distributions
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Galli, André
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Wurz, Peter
-
Kallio, Esa
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Ekenbäck, Andrea ...
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Holmström, Mats
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Barabash, Stas
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show more...
-
Gregoriev, Alexa ...
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Futaana, Yoshifu ...
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Fok, Mei-Ching
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Gunell, H
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Geochemistry
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Geophysics
- Articles in the publication
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Journal of Geoph ...
- By the university
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Umeå University