Search: id:"swepub:oai:DiVA.org:kth-273862" >
Evolution of the pl...
Evolution of the plasma environment of comet 67P from spacecraft potential measurements by the Rosetta Langmuir probe instrument
-
- Odelstad, Elias (author)
- Uppsala universitet,Institutionen för fysik och astronomi,Institutet för rymdfysik, Uppsalaavdelningen
-
- Eriksson, Anders I. (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
-
- Edberg, Niklas J. T. (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
-
show more...
-
- Johansson, Fredrik (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
-
- Vigren, Erik (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
-
- André, Mats (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
-
- Tzou, C. -Y (author)
- Univ Bern, Phys Inst, Bern, Switzerland,Univ London Imperial Coll Sci Technol & Med, Space & Atmospher Phys Grp, London, England.
-
- Carr, C. (author)
- Univ London Imperial Coll Sci Technol & Med, Space & Atmospher Phys Grp, London, England.
-
- Cupido, E. (author)
- Univ London Imperial Coll Sci Technol & Med, Space & Atmospher Phys Grp, London, England.
-
show less...
-
(creator_code:org_t)
- 2015
- 2015
- English.
-
In: Geophysical Research Letters. - 0094-8276 .- 1944-8007. ; 42:23
- Related links:
-
https://kth.diva-por... (primary) (Raw object)
-
show more...
-
https://uu.diva-port... (primary) (Raw object)
-
https://urn.kb.se/re...
-
https://doi.org/10.1...
-
https://urn.kb.se/re...
-
show less...
Abstract
Subject headings
Close
- We study the evolution of the plasma environment of comet 67P using measurements of the spacecraft potential from early September 2014 (heliocentric distance 3.5 AU) to late March 2015 (2.1 AU) obtained by the Langmuir probe instrument. The low collision rate keeps the electron temperature high (similar to 5 eV), resulting in a negative spacecraft potential whose magnitude depends on the electron density. This potential is more negative in the northern (summer) hemisphere, particularly over sunlit parts of the neck region on the nucleus, consistent with neutral gas measurements by the Cometary Pressure Sensor of the Rosetta Orbiter Spectrometer for Ion and Neutral Analysis. Assuming constant electron temperature, the spacecraft potential traces the electron density. This increases as the comet approaches the Sun, most clearly in the southern hemisphere by a factor possibly as high as 20-44 between September 2014 and January 2015. The northern hemisphere plasma density increase stays around or below a factor of 8-12, consistent with seasonal insolation change.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
To the university's database