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Electron energetics in the Martian dayside ionosphere: Model comparisons with MAVEN data
dc.contributor.authorSakai, Shotaro
dc.contributor.authorAndersson, Laila
dc.contributor.authorCravens, Thomas E.
dc.contributor.authorMitchell, David L.
dc.contributor.authorMazelle, Christian
dc.contributor.authorRahmati, Ali
dc.contributor.authorFowler, Christopher M.
dc.contributor.authorBougher, Stephen W.
dc.contributor.authorThiemann, Edward M. B.
dc.contributor.authorEparvier, Francis G.
dc.contributor.authorFontenla, Juan M.
dc.contributor.authorMahaffy, Paul R.
dc.contributor.authorConnerney, John E. P.
dc.contributor.authorJakosky, Bruce M.
dc.date.accessioned2016-10-17T21:18:50Z
dc.date.available2017-09-06T14:20:20Zen
dc.date.issued2016-07
dc.identifier.citationSakai, Shotaro; Andersson, Laila; Cravens, Thomas E.; Mitchell, David L.; Mazelle, Christian; Rahmati, Ali; Fowler, Christopher M.; Bougher, Stephen W.; Thiemann, Edward M. B.; Eparvier, Francis G.; Fontenla, Juan M.; Mahaffy, Paul R.; Connerney, John E. P.; Jakosky, Bruce M. (2016). "Electron energetics in the Martian dayside ionosphere: Model comparisons with MAVEN data." Journal of Geophysical Research: Space Physics 121(7): 7049-7066.
dc.identifier.issn2169-9380
dc.identifier.issn2169-9402
dc.identifier.urihttps://hdl.handle.net/2027.42/134186
dc.description.abstractThis paper presents a study of the energetics of the dayside ionosphere of Mars using models and data from several instruments on board the Mars Atmosphere and Volatile EvolutioN spacecraft. In particular, calculated photoelectron fluxes are compared with suprathermal electron fluxes measured by the Solar Wind Electron Analyzer, and calculated electron temperatures are compared with temperatures measured by the Langmuir Probe and Waves experiment. The major heat source for the thermal electrons is Coulomb heating from the suprathermal electron population, and cooling due to collisional rotational and vibrational CO2 dominates the energy loss. The models used in this study were largely able to reproduce the observed high topside ionosphere electron temperatures (e.g., 3000 K at 300 km altitude) without using a topside heat flux when magnetic field topologies consistent with the measured magnetic field were adopted. Magnetic topology affects both suprathermal electron transport and thermal electron heat conduction. The effects of using two different solar irradiance models were also investigated. In particular, photoelectron fluxes and electron temperatures found using the Heliospheric Environment Solar Spectrum Radiation irradiance were higher than those with the Flare Irradiance Spectrum Model‐Mars. The electron temperature is shown to affect the O2+ dissociative recombination rate coefficient, which in turn affects photochemical escape of oxygen from Mars.Key PointsHigh electron temperatures (e.g., 3000 K) can be obtained in the Martian topside ionosphere without invoking solar wind heatingThe magnetic topology is a key factor in determining electron temperatures and photoelectron fluxes at MarsDetails of the Martian ionospheric electron temperature are shown to significantly affect electron‐ion recombination and hot O production
dc.publisherAcademic Press
dc.publisherWiley Periodicals, Inc.
dc.subject.otherMars
dc.subject.otherelectron temperature
dc.subject.otherionosphere
dc.subject.otherphotoelectrons
dc.titleElectron energetics in the Martian dayside ionosphere: Model comparisons with MAVEN data
dc.typeArticleen_US
dc.rights.robotsIndexNoFollow
dc.subject.hlbsecondlevelAstronomy and Astrophysics
dc.subject.hlbtoplevelScience
dc.description.peerreviewedPeer Reviewed
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/134186/1/jgra52757_am.pdf
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/134186/2/jgra52757.pdf
dc.identifier.doi10.1002/2016JA022782
dc.identifier.sourceJournal of Geophysical Research: Space Physics
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