Search: onr:"swepub:oai:DiVA.org:umu-191346" >
Solar cycle variati...
Solar cycle variation of ion escape from Mars
-
- Nilsson, Hans (author)
- Umeå universitet,Institutionen för fysik,Swedish Institute of Space Physics, Kiruna, Sweden
-
- Zhang, Qi (author)
- Umeå universitet,Institutionen för fysik,Swedish Institute of Space Physics, Kiruna, Sweden
-
- Stenberg Wieser, Gabriella (author)
- Umeå universitet,Swedish Institute of Space Physics, Kiruna, Sweden
-
show more...
-
- Holmström, Mats (author)
- Umeå universitet,Institutionen för fysik,Swedish Institute of Space Physics, Kiruna, Sweden
-
- Barabash, Stas (author)
- Swedish Institute of Space Physics, Kiruna, Sweden
-
- Futaana, Yoshifumi (author)
- Swedish Institute of Space Physics, Kiruna, Sweden
-
- Fedorov, Andrey (author)
- Institut de Recherche en Astrophysique et Planétologie, Toulouse, France
-
- Persson, Moa (author)
- Swedish Institute of Space Physics, Kiruna, Sweden; Institut de Recherche en Astrophysique et Planétologie, 9 avenue du Colonel Roche BP 44346 31028 Toulouse Cedex 4, France
-
- Wieser, Martin (author)
- Swedish Institute of Space Physics, Kiruna, Sweden
-
show less...
-
(creator_code:org_t)
- Academic Press, 2023
- 2023
- English.
-
In: Icarus. - : Academic Press. - 0019-1035 .- 1090-2643. ; 393
- Related links:
-
https://doi.org/10.1...
-
show more...
-
https://umu.diva-por... (primary) (Raw object)
-
https://doi.org/10.1...
-
https://urn.kb.se/re...
-
https://doi.org/10.1...
-
show less...
Abstract
Subject headings
Close
- Using Mars Express data from 2007 until 2020 we show how ion outflow from Mars varied over more than a solar cycle, from one solar minimum to another. The data was divided into intervals with a length of one Martian year, starting from 30 April 2007 and ending 13 July 2020. The net escape rate was about 5×1024s−1 in the first covered minimum, and 2−3×1024s−1 in the most recent minimum. Ion escape peaked at 1×1025s−1 during the intervening solar maximum. The outflow is a clear function of the solar cycle, in agreement with previous studies which found a clear relationship between solar EUV flux and ion escape at Mars. The outflow during solar maximum is 2.5 to 3 times higher than in the surrounding solar minima. The average solar wind dynamic pressure over a Martian year was investigated, but does not vary much with the solar cycle. The escape rate at solar maximum is in good agreement with some recent MAVEN studies, and dominated by low energy ions at most sampled locations. A simple linear fit to the data gives a prediction of the escape rate for the much stronger solar maximum during the Phobos mission in 1989 that is consistent with observations. The fit also implies a non-linear response of ion escape for low solar EUV, with a lower initial escape response for lower solar EUV levels than those of the studied data set.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- Magnetospheres
- Mars
- Mars atmosphere
- Mars climate
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
-
Icarus
(Search for host publication in LIBRIS)
To the university's database