A Critical Extension to Martian Ozone Abundances Using WFPC2

Details A Critical Extension to Martian Ozone Abundances Using WFPC2 A Critical Extension to Martian Ozone Abundances Using WFPC2

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8366w&link_type=abstract

HST Proposal ID #8366

Computer Science

Hst Proposal Id #8366 Solar System

Scientific paper

We propose to use archival WFPC2 data to determine the atmospheric ozone abundances on Mars for a period not well studied by previous efforts. This quantity is a fundamental diagnostic of that planet's atmospheric processes. The multi- year coverage of the WFPC2 data {1995-7} provides information about the latitudinal, seasonal, and interannual variations of Martian ozone column densities. We will focus our efforts on the period from late spring through the end of summer {in the northern hemisphere}, with special attention given to low-to- mid latitude regions where coverage is very incomplete. We will model the ozone absorption in the Hartley Band taking into account Rayleigh scattering, dust, and cloud opacities. Our analyses will involve F255W, whose throughput curves are ideal for measurements of the Hartley Band, F336W, and F410M. We maximize sensitivity to small amounts of ozone by examining regions with large atmospheric pathlengths {i.e., near the limb}. Artifacts associated with image restoration are avoided by, instead, convolving the models with the relevant point spread function. Our approach, in combination with the unique nature of the requested dataset, will allow for the most accurate and extensive ozone abundances to date for the seasons sampled. The Mars Global Surveyor does NOT have capability to provide such information.

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