Measurement of Individual H⁺ and O⁺ Ion Temperatures in the Topside Ionosphere

dc.contributor.ISNI0000 0000 3175 0999 (Heelis, RA)
dc.contributor.ORCID0000-0002-5543-5357 (Heelis, RA)
dc.contributor.authorHsu, Chih-Te
dc.contributor.authorHeelis, Roderick A.
dc.contributor.utdAuthorHsu, Chih-Te
dc.contributor.utdAuthorHeelis, Roderick A.
dc.date.accessioned2019-05-15T21:07:49Z
dc.date.available2019-05-15T21:07:49Z
dc.date.created2018-02-05
dc.description.abstractPlasma temperatures in the ionosphere are associated with both the dynamics and spatial distribution of the neutral and charge particles. During the daytime, temperatures are determined by solar energy inputs and energy exchange between charged and neutral particles. Plasma transport parallel to the magnetic field adds another influence on temperatures through adiabatic processes that are most evident during the nighttime. Previous observations suggest that the topside H⁺ temperature (T_{H⁺+}) should reside between the O⁺ temperature (T_{O+}) and the electron temperature (T_e), and further calculations confirm the preferential heat transfer from the electrons to H⁺ in the topside. In this work we implement a more sophisticated analysis procedure to extract individual mass-dependent ion temperatures from the retarding potential analyzer measurements on the DMSP F15 satellite. The results show that the daytime T_{H+} is a few hundred degrees higher than T_{O+} at all longitudes. The nighttime temperature difference between T_{H+} and T_{O+} is indicative of mass-dependent adiabatic heating and cooling processes across the equatorial region. The ion temperatures and measured plasma flows present clear longitudinal variations that are associated with magnetic declination.
dc.description.departmentSchool of Natural Sciences and Mathematics
dc.description.sponsorshipThis work is supported by NASA grant NNX10AT02G and by AFOSR MURI grant FA9559‐16‐1‐0364.
dc.identifier.bibliographicCitationHsu, Chih-Te, and Roderick A. Heelis. 2018. "Measurement of Individual H+ and O+ Ion Temperatures in the Topside Ionosphere." Journal of Geophysical Research: Space Physics 123(2): 1525-1533, doi:10.1002/2017JA024932
dc.identifier.issn2169-9380
dc.identifier.urihttps://hdl.handle.net/10735.1/6486
dc.identifier.volume123
dc.language.isoen
dc.publisherAmer Geophysical Union
dc.relation.urihttp://dx.doi.org/10.1002/2017JA024932
dc.rights©2018 American Geophysical Union. All Rights Reserved.
dc.source.journalJournal of Geophysical Research: Space Physics
dc.subjectIonosphere
dc.subjectElectron temperature
dc.subjectPlasma (Ionized gases)
dc.subjectTemperature
dc.subjectAtmosphere
dc.titleMeasurement of Individual H⁺ and O⁺ Ion Temperatures in the Topside Ionosphere
dc.type.genrearticle

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