Other
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007hst..prop11282s&link_type=abstract
HST Proposal ID #11282. Cycle 16
Other
Scientific paper
Mars atmospheric aerosols such as dust, ice and ozone play important roles in the meteorology of the planet. Much controversy still exists among observers and modelers over what represents the average Mars atmosphere, and how it changes diurnally, seasonally and interannually. Ozone is an important tracer of the photochemical processes responsible for the stability of Mars' carbon dioxide atmosphere. Water vapor is also an important trace element in atmospheric models, and contributes to the formation of water ice clouds. Seasonal global temperature fluctuations affect the water vapor saturation altitude hygropause, which in turn determines water ice cloud formation altitude at low- to mid-latitudes. Models predict large diurnal ozone fluctuations as a result of the seasonal changes in the hygropause. The mapping of global, diurnal water ice clouds and ozone column densities can only be performed by using Hubble Space Telescope HST WFPC2 multi-band images of Mars. No other spacecraft, including Mars Global Surveyor and Mars Express, can achieve this. Diurnal water ice cloud and ozone column density maps derived from a long baseline of HST measurements 1993-2004, would serve as useful reference data for workers using current mission data, such as Mars Orbital Camera MOC, providing context and connection to their temporally limited data. A water ice map and an ozone column density map have already been produced by the PI from the January 2001 HST cycle9 Mars multi-band WFPC2 images.;
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