Search: onr:"swepub:oai:DiVA.org:kth-238924" >
Enhanced Escape of ...
Enhanced Escape of Spacecraft Photoelectrons Caused by Langmuir and Upper Hybrid Waves
-
- Graham, Daniel B. (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
-
- Vaivads, Andris (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
-
- Khotyaintsev, Yu, V (author)
- Swedish Inst Space Phys, Uppsala, Sweden.
-
show more...
-
- Eriksson, Anders (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
-
- André, Mats (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
-
- Malaspina, D. M. (author)
- Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA.
-
- Lindqvist, Per-Arne (author)
- KTH,Rymd- och plasmafysik,KTH Royal Inst Technol, Sch Elect Engn, Space & Plasma Phys, Stockholm, Sweden
-
- Gershman, D. J. (author)
- NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.;Univ Maryland, Dept Astron, College Pk, MD 20742 USA.
-
- Plaschke, F. (author)
- Austrian Acad Sci, Space Res Inst, Graz, Austria.
-
- Khotyaintsev, Yuri V. (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
-
show less...
-
(creator_code:org_t)
- AMER GEOPHYSICAL UNION, 2018
- 2018
- English.
-
In: Journal of Geophysical Research - Space Physics. - : AMER GEOPHYSICAL UNION. - 2169-9380 .- 2169-9402. ; 123:9, s. 7534-7553
- Related links:
-
https://urn.kb.se/re...
-
show more...
-
https://doi.org/10.1...
-
https://urn.kb.se/re...
-
show less...
Abstract
Subject headings
Close
- The spacecraft potential is often used to infer rapid changes in the thermal plasma density. The variations in spacecraft potential associated with large-amplitude Langmuir and upper hybrid waves are investigated with the Magnetospheric Multiscale (MMS) mission. When large-amplitude Langmuir and upper hybrid waves are observed, the spacecraft potential increases. The changes in spacecraft potential are shown to be due to enhanced photoelectron escape from the spacecraft when the wave electric fields reach large amplitude. The fluctuations in spacecraft potential follow the envelope function of the Langmuir and upper hybrid waves. Comparison with the high-resolution electron moments shows that the changes in spacecraft potential associated with the waves are not due to density perturbations. Indeed, using the spacecraft potential as a density probe leads to unphysically large density fluctuations. In addition, the changes in spacecraft potential are shown to increase as density decreases: larger spacecraft potential changes are observed in the magnetosphere, than in the magnetosheath and solar wind. These results show that external electric fields can lead to unphysical results when the spacecraft potential is used as a density probe. The results suggest that fluctuations in the spacecraft potential alone cannot be used to determine whether nonlinear processes associated with Langmuir and upper hybrid waves, such as the ponderomotive force and three-wave decay, are occurring.
Subject headings
- 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)
Keyword
- Langmuir waves
- photoelectron current
- spacecraft potential
- upper hybrid waves
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
To the university's database
- By the author/editor
-
Graham, Daniel B ...
-
Vaivads, Andris
-
Khotyaintsev, Yu ...
-
Eriksson, Anders
-
André, Mats
-
Malaspina, D. M.
-
show more...
-
Lindqvist, Per-A ...
-
Gershman, D. J.
-
Plaschke, F.
-
Khotyaintsev, Yu ...
-
show less...
- About the subject
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Physical Science ...
-
and Fusion Plasma an ...
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Physical Science ...
-
and Astronomy Astrop ...
- Articles in the publication
-
Journal of Geoph ...
- By the university
-
Royal Institute of Technology
-
Uppsala University