Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.4207h&link_type=abstract
American Astronomical Society, DPS meeting #42, #42.07; Bulletin of the American Astronomical Society, Vol. 42, p.1042
Astronomy and Astrophysics
Astronomy
Scientific paper
Herschel has observed Mars with its three instruments, the Heterodyne Instrument for the Far Infrared (HIFI), the Photodetector Array Camera & Spectrometer (PACS) and the Spectral and Photometric Imaging Receiver (SPIRE) as part of the HssO Key programme. SPIRE provided for the first time a far infrared spectrum of Mars from 0.45 to 1.55 THz. From these observations during Ls = 5°, water vapor and carbon monoxide mixing ratios of 100 ppm and 900 ppm respectively were derived. PACS observed Mars twice during Ls = 340 ° and Ls = 108 ° in the frequency range from 1.43 to 5.26 THz. The spectra show high signal-to-noise- ratio (SNR) carbon monoxide and water lines including water isotopes. HIFI has observed Mars around Ls = 78° and Ls = 108° and performed line scans from band 1a to 6b (for technical reasons excluding band 5b). Furthermore dedicated observations on carbon- and oxygen isotopes in carbon monoxide and oxygen- and hydrogen isotopes in water vapor as well as hydrogen peroxide, hydrogen chloride and molecular oxygen were executed. The latter presents the first observation of molecular oxygen in the submm wave regime. From the very high SNR spectrum a (constant with altitude) volume mixing ratio of 1400 ppm has been derived, consistent with ground-based observations in the oxygen A band (around 763 nm) from the early 1970s. Finally from the analysis of 2 carbon monoxide isotopes a globally averaged volume mixing ratio of constant 980 ppm and a vertical temperature profile have been retrieved. Compared to general circulation model calculations the observations show up to 10 K lower temperatures in the middle atmosphere of Mars.
Blecka M.
de Val-Borro Miguel
Feuchtgruber Helmut
Hartogh Paul
HssO Team
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