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  • Johansson, Fredrik L.Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen (author)

Rosetta photoelectron emission and solar ultraviolet flux at comet 67P

  • Article/chapterEnglish2017

Publisher, publication year, extent ...

  • 2017-09-13
  • Oxford University Press (OUP),2017
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:kth-273855
  • https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-273855URI
  • https://doi.org/10.1093/mnras/stx2369DOI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-376695URI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • QC 20200624
  • The Langmuir Probe instrument on Rosetta monitored the photoelectron emission current of the probes during the Rosetta mission at comet 67P/Churyumov-Gerasimenko, in essence acting as a photodiode monitoring the solar ultraviolet radiation at wavelengths below 250 nm. We have used three methods of extracting the photoelectron saturation current from the Langmuir probe measurements. The resulting data set can be used as an index of the solar far and extreme ultraviolet at the Rosetta spacecraft position, including flares, in wavelengths which are important for photoionization of the cometary neutral gas. Comparing the photoemission current to data measurements by MAVEN/EUVM and TIMED/SEE, we find good correlation when 67P was at large heliocentric distances early and late in the mission, but up to 50 per cent decrease of the expected photoelectron current at perihelion. We discuss possible reasons for the photoemission decrease, including scattering and absorption by nanograins created by disintegration of cometary dust far away from the nucleus.

Subject headings and genre

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  • Odelstad, EliasUppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Rymd- och plasmafysik,Swedish Inst Space Phys, Box 537, SE-75121 Uppsala, Sweden.(Swepub:uu)eliod143 (author)
  • Paulsson, J. J. P.Univ Oslo, Dept Phys, Sem Saelands Vei 24,Postbox 1048, N-0317 Oslo, Norway (author)
  • Harang, S. S.Univ Oslo, Dept Phys, Sem Saelands Vei 24,Postbox 1048, N-0317 Oslo, Norway (author)
  • Eriksson, Anders I.Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen(Swepub:uu)andeerik (author)
  • Mannel, T.Austrian Acad Sci, Space Res Inst, Schmiedlstr 6, A-8042 Graz, Austria;Karl Franzens Univ Graz, Phys Inst, Univ Pl 5, A-8010 Graz, Austria (author)
  • Vigren, ErikUppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen(Swepub:uu)erivi300 (author)
  • Edberg, Niklas J. T.Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Univ Colorado, Lab Atmospher & Space Phys, 3665 Discovery Dr, Boulder, CO 80303 USA,Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen(Swepub:uu)niked861 (author)
  • Miloch, W. J.Univ Oslo, Dept Phys, Sem Saelands Vei 24,Postbox 1048, N-0317 Oslo, Norway (author)
  • Wedlund, C. SimonUniv Oslo, Dept Phys, Sem Saelands Vei 24,Postbox 1048, N-0317 Oslo, Norway (author)
  • Thiemann, E.Univ Colorado, Lab Atmospher & Space Phys, 3665 Discovery Dr, Boulder, CO 80303 USA (author)
  • Eparvier, F.Univ Colorado, Lab Atmospher & Space Phys, 3665 Discovery Dr, Boulder, CO 80303 USA (author)
  • Andersson, L.Univ Colorado, Lab Atmospher & Space Phys, 3665 Discovery Dr, Boulder, CO 80303 USA (author)
  • Uppsala universitetInstitutet för rymdfysik, Uppsalaavdelningen (creator_code:org_t)

Related titles

  • In:Monthly notices of the Royal Astronomical Society: Oxford University Press (OUP)469, s. S626-S6350035-87111365-2966

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