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Statistical analysi...
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Broiles, Thomas W.Southwest Res Inst, Div Space Sci & Engn, 6220 Culebra Rd, San Antonio, TX 78238 USA.
(author)
Statistical analysis of suprathermal electron drivers at 67P/Churyumov-Gerasimenko
- Article/chapterEnglish2016
Publisher, publication year, extent ...
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2016-11-17
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OXFORD UNIV PRESS,2016
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electronicrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:kth-273843
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-273843URI
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https://doi.org/10.1093/mnras/stw2942DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-328417URI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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QC 20200602
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We use observations from the Ion and Electron Sensor (IES) on board the Rosetta spacecraft to study the relationship between the cometary suprathermal electrons and the drivers that affect their density and temperature. We fit the IES electron observations with the summation of two kappa distributions, which we characterize as a dense and warm population (similar to 10 cm(-3) and similar to 16 eV) and a rarefied and hot population (similar to 0.01 cm(-3) and similar to 43 eV). The parameters of our fitting technique determine the populations' density, temperature, and invariant kappa index. We focus our analysis on the warm population to determine its origin by comparing the density and temperature with the neutral density and magnetic field strength. We find that the warm electron population is actually two separate sub-populations: electron distributions with temperatures above 8.6 eV and electron distributions with temperatures below 8.6 eV. The two sub-populations have different relationships between their density and temperature. Moreover, the two sub-populations are affected by different drivers. The hotter sub-population temperature is strongly correlated with neutral density, while the cooler sub-population is unaffected by neutral density and is only weakly correlated with magnetic field strength. We suggest that the population with temperatures above 8.6 eV is being heated by lower hybrid waves driven by counterstreaming solar wind protons and newly formed, cometary ions created in localized, dense neutral streams. To the best of our knowledge, this represents the first observations of cometary electrons heated through wave-particle interactions.
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Burch, J. L.Southwest Res Inst, Div Space Sci & Engn, 6220 Culebra Rd, San Antonio, TX 78238 USA.
(author)
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Chae, K.Southwest Res Inst, Div Space Sci & Engn, 6220 Culebra Rd, San Antonio, TX 78238 USA.,Tech Univ Carolo Wilhelmina Braunschweig, Inst Geophys & Extraterr Phys, Mendelssohnstr 3, D-38106 Braunschweig, Germany.
(author)
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Clark, G.Johns Hopkins Univ, Appl Phys Lab, 11100 Johns Hopkins Rd, Laurel, MD 20723 USA.
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Cravens, T. E.Univ Kansas, Dept Phys & Astron, 1450 Jayhawk Blvd, Lawrence, KS 66045 USA.
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Eriksson, AndersUppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen(Swepub:uu)andeerik
(author)
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Fuselier, S. A.Southwest Res Inst, Div Space Sci & Engn, 6220 Culebra Rd, San Antonio, TX 78238 USA.;Univ Texas San Antonio, Dept Phys & Astron, San Antonio, TX 78249 USA.
(author)
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Frahm, R. A.Southwest Res Inst, Div Space Sci & Engn, 6220 Culebra Rd, San Antonio, TX 78238 USA.
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Gasc, S.Univ Bern, Phys Inst, Sidlerstr 5, CH-3012 Bern, Switzerland.
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Goldstein, R.Southwest Res Inst, Div Space Sci & Engn, 6220 Culebra Rd, San Antonio, TX 78238 USA.
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Henri, P.CNRS, LPC2E, F-45071 Orleans, France.
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Koenders, C.Tech Univ Carolo Wilhelmina Braunschweig, Inst Geophys & Extraterr Phys, Mendelssohnstr 3, D-38106 Braunschweig, Germany.
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Livadiotis, G.Southwest Res Inst, Div Space Sci & Engn, 6220 Culebra Rd, San Antonio, TX 78238 USA.
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Mandt, K. E.Southwest Res Inst, Div Space Sci & Engn, 6220 Culebra Rd, San Antonio, TX 78238 USA.;Univ Texas San Antonio, Dept Phys & Astron, San Antonio, TX 78249 USA.
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Mokashi, P.Southwest Res Inst, Div Space Sci & Engn, 6220 Culebra Rd, San Antonio, TX 78238 USA.
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Nemeth, Z.Wigner Res Ctr Phys, H-1121 Budapest, Hungary.
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Odelstad, EliasUppsala universitet,Rymd- och plasmafysik,Univ Kansas, Dept Phys & Astron, 1450 Jayhawk Blvd, Lawrence, KS 66045 USA.,Uppsala universitet, Rymd- och plasmafysik(Swepub:uu)eliod143
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Rubin, M.Univ Bern, Phys Inst, Sidlerstr 5, CH-3012 Bern, Switzerland.
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Samara, M.Goddard Space Flight Ctr, Heliophys Div, 8800 Greenbelt Rd, Greenbelt, MD 20771 USA.
(author)
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Southwest Res Inst, Div Space Sci & Engn, 6220 Culebra Rd, San Antonio, TX 78238 USA.Tech Univ Carolo Wilhelmina Braunschweig, Inst Geophys & Extraterr Phys, Mendelssohnstr 3, D-38106 Braunschweig, Germany.
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In:Monthly notices of the Royal Astronomical Society: OXFORD UNIV PRESS462, s. S312-S3220035-87111365-2966
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Broiles, Thomas ...
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Burch, J. L.
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Chae, K.
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Clark, G.
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Cravens, T. E.
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Eriksson, Anders
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Fuselier, S. A.
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Frahm, R. A.
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Gasc, S.
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Goldstein, R.
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Henri, P.
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Koenders, C.
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Livadiotis, G.
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Mandt, K. E.
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Mokashi, P.
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Nemeth, Z.
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Odelstad, Elias
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Rubin, M.
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Samara, M.
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