Effect of the magnetic field on the energetics of mars ionosphere

Y. W. Choi, Jhoon Kim, K. W. Min, A. F. Nagy, K. I. Oyama

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

The coupled, one-dimensional electron and ion energy equations, with a combination of small steady and fluctuating horizontal magnetic fields imposed, are solved for the Mars ionosphere, corresponding to conditions encountered during the Viking mission. A series of calculations with various boundary conditions and heat sources result in a range of electron and ion temperature profiles, which are compared with the results obtained by the RPA's carried aboard the Viking landers. It is shown that solar EUV heating alone does not lead to the observed temperature profiles and that assuming reasonable heat fluxes at the top result in good agreement. It is also found that the introduction of small steady and altitude dependent fluctuating horizontal magnetic fields, which modify the thermal conductivity, leads to electron temperatures in reasonably good agreement with the RPA data, but does not match the observed ion temperatures above about 240 km. The effects of chemical and Joule heating are also examined and found not to be significant.

Original languageEnglish
Pages (from-to)2753-2756
Number of pages4
JournalGeophysical Research Letters
Volume25
Issue number14
DOIs
Publication statusPublished - 1998 Jan 1

Fingerprint

mars
ionospheres
Mars
ionosphere
energetics
electron energy
ion temperature
magnetic field
temperature profile
electron
temperature profiles
ion
magnetic fields
solar heating
Joule heating
heat source
heat sources
thermal conductivity
heat flux
boundary condition

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Choi, Y. W. ; Kim, Jhoon ; Min, K. W. ; Nagy, A. F. ; Oyama, K. I. / Effect of the magnetic field on the energetics of mars ionosphere. In: Geophysical Research Letters. 1998 ; Vol. 25, No. 14. pp. 2753-2756.
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Effect of the magnetic field on the energetics of mars ionosphere. / Choi, Y. W.; Kim, Jhoon; Min, K. W.; Nagy, A. F.; Oyama, K. I.

In: Geophysical Research Letters, Vol. 25, No. 14, 01.01.1998, p. 2753-2756.

Research output: Contribution to journalArticle

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AU - Choi, Y. W.

AU - Kim, Jhoon

AU - Min, K. W.

AU - Nagy, A. F.

AU - Oyama, K. I.

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AB - The coupled, one-dimensional electron and ion energy equations, with a combination of small steady and fluctuating horizontal magnetic fields imposed, are solved for the Mars ionosphere, corresponding to conditions encountered during the Viking mission. A series of calculations with various boundary conditions and heat sources result in a range of electron and ion temperature profiles, which are compared with the results obtained by the RPA's carried aboard the Viking landers. It is shown that solar EUV heating alone does not lead to the observed temperature profiles and that assuming reasonable heat fluxes at the top result in good agreement. It is also found that the introduction of small steady and altitude dependent fluctuating horizontal magnetic fields, which modify the thermal conductivity, leads to electron temperatures in reasonably good agreement with the RPA data, but does not match the observed ion temperatures above about 240 km. The effects of chemical and Joule heating are also examined and found not to be significant.

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