Advertisement

Earth, Moon, and Planets

, Volume 96, Issue 3–4, pp 109–117 | Cite as

TITAN’S GROUND REFLECTANCE RETRIEVAL FROM CASSINI-VIMS DATA TAKEN DURING THE JULY 2ND, 2004 FLY-BY AT 2 AM UT

  • A. Adriani
  • M. L. Moriconi
  • G. L. Liberti
  • A. Gardini
  • R. Orosei
  • E. D’Aversa
  • G. Filacchione
  • A. Coradini
Article

Abstract

An attempt to evaluate the preliminary values of the Titan's surface albedo at 2 μm from the first Cassini-VIMS observations of the moon is presented. The methodology is based on the application of radiative transfer calculations and a microphysical model of the Titan atmosphere based on fractal aerosol. As a first guess, the surface has been considered flat and lambertian. The results are presented as a function of the geographical coordinates associated to the image pixels. The libRadtran package, using the radiative transfer equation solver DISORT 2.0, has been applied for the calculations. A test run to evaluate the model performances, using ground based observations of Titan as reference in the range of wavelengths 0.3-1.0 μm, has been carried out.The retrieved values of the surface albedo range between 0.03 and 0.22.

Keywords

Titan atmosphere surface albedo Cassini radiative transfer calculation 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Notes

Acknowledgments

We thank Bernhard Mayer and Arve Kylling for the support given to us in adapting the code developed by them for the Earth to the extraterrestrial atmosphere of Titan. This work has been financially supported by the Italian Space Agency (ASI).

References

  1. Acton C. H.: (1996), Planet. Space Sci. 44:65–70Google Scholar
  2. Bouchez, A. H.: 2004, Seasonal trends in Titan’s atmosphere: haze, wind and clouds, Ph.D. Thesis, California Institute of TechnologyGoogle Scholar
  3. Cabane M., Chassefière E., Israel G.: (1992), Icarus 96:176–189Google Scholar
  4. Cabane M., Rannou P., Chassefière E., Israel G., (1993), Planet. Space Sci. 41:257–267Google Scholar
  5. Chandrasekhar S. (1960), Radiative Transfer. Dover Publication Inc., New YorkGoogle Scholar
  6. Courtin R., Wagener R., McKay C. P., Caldwell J., Fricke K. H., Raulin F., Bruston P.: (1991), Icarus 90:43–56Google Scholar
  7. Coustenis A., Lellouch E., Schmitt B., Rannou P., Cabane M., McKay C. P., Maillard J. -P. (1998), Bull. Am. Astron. Soc. 30:1087Google Scholar
  8. Cox C., Munk W. (1954a), J. Opt. Soc. Am. 44:838–850Google Scholar
  9. Cox C., Munk W. (1954b), J. Mar. Res. 13:198–227Google Scholar
  10. Evans K. F., Stephens G. L. (1991), J. Quant. Spectrosc. Radiat. Transfer 46(5):413–423Google Scholar
  11. Griffith C. A., Owen T., Geballe T.R., Rayner J., Rannou P. (2003), Science 300:628–630Google Scholar
  12. Karkoschka E. (1994), Icarus 111:174–192Google Scholar
  13. Lindal G. F., Wood G. E., Hotz H. B., Sweetnam D. N., Eshleman V. R., Tyler G. L. (1983), Icarus 53:348–363Google Scholar
  14. Mayer, B.: 1999, I3RC phase 1 results from the MYSTIC Monte Carlo model, Extended abstract for the I3RC (Intercomparison of 3D radiation codes) workshop, Tucson, Arizona, November 17–19, 1999Google Scholar
  15. Mayer B., Kylling A. (2005), Atmos. Chem. Phys. Discuss. 5:1319–1381Google Scholar
  16. McKay C. P., Pollack J. B., Courtin R. (1989), Icarus 80:23–53Google Scholar
  17. Nakajima T., Tanaka M. (1988), J. Quant. Spectros. Radiat. Transfer 40:51–69Google Scholar
  18. Neff J. S., Humm D. C., Bergstralh J. T., Cochran A. L., Cochran W. D., Barker E. S., Tull R. G. (1984), Icarus 60:221–235Google Scholar
  19. Rannou P., Cabane M., Chassefiere E., Botet R., McKay C. P., Courtin R. (1995), Icarus 118:355–372Google Scholar
  20. Rannou P., Cabane M., Botet R., Chassefiere E. (1997), J. Geophys. Res. 102:10997–11014Google Scholar
  21. Rannou P., McKay C. P., Botet R., Cabane M. (1999), Planet. Space Sci. 47:385–396Google Scholar
  22. Rannou P., McKay C. P., Lorenz R. D. (2003), Planet. Space Sci. 51:963–976Google Scholar
  23. Stamnes K. (1982), J. Quant. Spectrosc. Radiat. Transfer 28:47Google Scholar
  24. Stamnes K., Tsay S. -C., Wiscombe W., Jayaweera K. (1988), Appl. Opt. 27:2502–2509Google Scholar
  25. Wehrli, C.: 1985, Extraterrestrial Solar Spectrum, WRC Pub. 615.Google Scholar

Copyright information

© Springer 2006

Authors and Affiliations

  • A. Adriani
    • 1
  • M. L. Moriconi
    • 2
  • G. L. Liberti
    • 2
  • A. Gardini
    • 1
  • R. Orosei
    • 3
  • E. D’Aversa
    • 1
  • G. Filacchione
    • 3
  • A. Coradini
    • 1
    • 3
  1. 1.INAF – Istituto di Fisica dello Spazio InterplanetarioRomaItaly
  2. 2.CNR – Istituto di Scienza dell’Atmosfera e del ClimaRomaItaly
  3. 3.INAF – Istituto di Astrofisica Spaziale e Fisica CosmicaRomaItaly

Personalised recommendations