Modelling of time-dependention outflows at high geomagnetic latitudes

R. W. Cannata, T. L. Killeen, T. I. Gombosi, A. G. Burns, R. G. Roble

Research output: Contribution to journalArticle

Abstract

In a recent paper, Gombosi and Killeen (1987) applied a highly parameterized thermospheric Joule heat source as a boundary condition in the time-dependent, ion outflow model of Gombosi et al. (1985) to show that episodic ion outflows at high geomagnetic latitudes could result from low altitude ion frictional heating. To delineate more realistically the time-dependent thermosphere/ionosphere environment, we extend this previous study by using output from the Thermospheric General Circulation Model (TGCM) of the National Center for Atmospheric Research (NCAR) as input to the same hydrodynamic polar wind code for a set of case studies which follow the thermal forcing history of individual, ionospheric, convecting flux tubes. Using derived, time-varying frictional heating rates such as those experienced by these flux tubes, we show that transverse ion heating below 500 km can provide sufficient energy to perturb the velocity distribution of the major ion species. The time-dependent flux tube heating results in localized regions of field-aligned O+ upflows. These results demonstrate that localized heating, generated from thermosphere/ionosphere interactions, may initiate heavy ion upwellings which, through further energization at higher altitudes, could evolve into the transient ion outflows as seen by the Dynamics Explorer 1 satellite.

Original languageEnglish (US)
Pages (from-to)89-92
Number of pages4
JournalAdvances in Space Research
Volume8
Issue number8
DOIs
StatePublished - 1988
Externally publishedYes

Fingerprint

geomagnetic latitude
outflow
ion
Ions
heating
modeling
Heating
ions
Ionosphere
thermosphere
Fluxes
tubes
Dynamics Explorer 1 satellite
ionospheres
ionosphere
low altitude
upwelling water
high altitude
heat sources
Velocity distribution

ASJC Scopus subject areas

  • Aerospace Engineering
  • Astronomy and Astrophysics
  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences(all)

Cite this

Cannata, R. W., Killeen, T. L., Gombosi, T. I., Burns, A. G., & Roble, R. G. (1988). Modelling of time-dependention outflows at high geomagnetic latitudes. Advances in Space Research, 8(8), 89-92. https://doi.org/10.1016/0273-1177(88)90267-0

Modelling of time-dependention outflows at high geomagnetic latitudes. / Cannata, R. W.; Killeen, T. L.; Gombosi, T. I.; Burns, A. G.; Roble, R. G.

In: Advances in Space Research, Vol. 8, No. 8, 1988, p. 89-92.

Research output: Contribution to journalArticle

Cannata, RW, Killeen, TL, Gombosi, TI, Burns, AG & Roble, RG 1988, 'Modelling of time-dependention outflows at high geomagnetic latitudes', Advances in Space Research, vol. 8, no. 8, pp. 89-92. https://doi.org/10.1016/0273-1177(88)90267-0
Cannata, R. W. ; Killeen, T. L. ; Gombosi, T. I. ; Burns, A. G. ; Roble, R. G. / Modelling of time-dependention outflows at high geomagnetic latitudes. In: Advances in Space Research. 1988 ; Vol. 8, No. 8. pp. 89-92.
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