Skip to main content Accessibility help
×
Home

Chemico-Physical Models of Cometary Atmospheres

  • W. F. Huebner (a1), J. J. Keady (a1), D. C. Boice (a1), H. U. Schmidt (a2) and R. Wegmann (a2)...

Abstract

Sublimation (vaporization) of the icy component of a cometary nucleus determines the initial composition of the coma gas as it streams outward and escapes. Photolytic reactions in the inner coma, escape of fast, light species such as atomic and molecular hydrogen, and solar wind interaction in the outer coma alter the chemical composition and the physical nature of the coma gas. Models that describe these interactions must include (1) chemical kinetics, (2) coma energy balance, (3) multifluid flow for the rapidly escaping light components, the heavier bulk fluid, and the plasma with separate temperatures for electrons and the remainder of the gas, (4) transition from a collision dominated inner region to free molecular flow of neutrals in the outer region, (5) pickup of cometary ions by the solar wind, (6) counter and cross streaming of neutrals with respect to the plasma which outside of the contact surface also contains solar wind ions, and (7) magnetic fields carried by the solar wind. Progress on such models is described and results including velocity, temperature, and number density profiles for important chemical species are presented and compared with observations.

    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      Chemico-Physical Models of Cometary Atmospheres
      Available formats
      ×

      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      Chemico-Physical Models of Cometary Atmospheres
      Available formats
      ×

      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      Chemico-Physical Models of Cometary Atmospheres
      Available formats
      ×

Copyright

References

Hide All
Huebner, W. F. 1980, “Chemical Kinetics in the Coma,” in Comets and the Origin of Life, Ed. Ponnamperuma, C., D. Reidel Publishing Company, Dordrecht, p. 91.
Huebner, W. F. 1985, “The Photochemistry of Comets,” in The Photochemistry of Atmospheres, Earth, the other Planets, and Comets, Ed. Levine, J. S., Academic Press Inc., New York, p. 437.
Huebner, W. F., and Keady, J. J. 1984, Astron. Astrophys. 135, 177.
Keller, H. U. 1976, Space Sci. Rev. 18, 641.
Marconi, M. L., and Mendis, D. A. 1984, Astrophys. J. 287, 445.
Meyer, N., Couturier, P., Hoang, S., Perche, C., Steinberg, J. L., Fainberg, J., and Meetre, C. 1985, EOS 66, 1016.
Schmidt, H. U., and Wegmann, R. 1982, “Plasma Flow and Magnetic Fields in Comets,” in Comets, Ed. Wilkening, L. L., The University of Arizona Press, Tucson, Arizona, p. 538.
Zwickl, R. D., Baker, D. N., Bame, S. J., Feldman, W. C., Fuselier, S. A., McComas, D. J., Young, D. T., and Steinberg, J. L. 1985, EOS 66, 1016.

Chemico-Physical Models of Cometary Atmospheres

  • W. F. Huebner (a1), J. J. Keady (a1), D. C. Boice (a1), H. U. Schmidt (a2) and R. Wegmann (a2)...

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed