Observations of Mars at Infrared and Microwave Wavelengths: Perspectives for FIRST

Details Observations of Mars at Infrared and Microwave Wavelengths: Perspectives for FIRST Observations of Mars at Infrared and Microwave Wavelengths: Perspectives for FIRST

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.460..397e&link_type=abstract

The Promise of the Herschel Space Observatory. Eds. G.L. Pilbratt, J. Cernicharo, A.M. Heras, T. Prusti, & R. Harris. ESA-SP 460

Computer Science

Solar System: Mars, Missions: First

Scientific paper

Observations of Mars at infrared wavelengths have been performed in July 1997 by the two spectrometers of the Infrared Space Observatory, in the range 2.3-200 microns. By comparing these data with radiative transfer models, the water vapor column density has been inferred. Using this information, the far infrared part of the Mars spectrum was modelled in order to retrieve information on the emissivity of the Martian surface. Observations of Mars with FIRST, using the PACS and SPIRE instruments, are expected to provide new information on the emissivity of the Martian surface at far-infrared and submillimeter wavelengths. Ground-based heterodyne spectroscopy measurements of Mars have been performed at IRAM, with the 30-m antenna of Pico Veleta, in April 1997. Transitions of HDO and H218O were observed at 226 GHz and 203 GHz respectively, and were used for an estimate of the water vapor vertical distribution. Observations of H2O and its isotopes with FIRST-HIFI will allow a new determination of the D/H ratio on Mars with a much better accuracy than the current one. In addition, FIRST-HIFI will be well adapted to the search for minor species at submillimeter wavelengths.

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