Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.4910s&link_type=abstract
American Astronomical Society, DPS meeting #41, #49.10
Astronomy and Astrophysics
Astronomy
Scientific paper
We have constructed 2-D maps of the O2 (a1Δg) emission (1.27 μm) for Ls = 20o (Jan 19, 2008) and Ls = 50o (March 27, 2008). The latter date is near Mars’ aphelion. The emission can be used as an indicator of ozone above 20 km. The data were collected using CSHELL at the NASA Infrared Telescope Facility. The slit was positioned in the North-South direction on Mars and spectral/spatial data were taken at 1.0 arcsec increments East to West across Mars. For Ls = 20o, the emission is concentrated at the poles, but for Ls = 50o, the emission is strong at all latitudes. These results will be contrasted with results for Ls = 357o (Jan 16, 2006) and Ls = 85o (Mar 1, 1997) that have been previously presented (Sanstead et al. 2007, BAAS, 39,455). The presence of significant O2 (a1Δg) emission (> 2.0 MR) also indicates that the local hygropause is at a low altitude (< 20 km).
We acknowledge support from NSF RUI-Program (AST-0505765 and AST-0805540) and thank the administrators and the staff of the NASA-IRTF for use of the telescope to acquire the data.
Bebawee R.
Hewagama Tilak
Mumma Michael J.
Novak Robert E.
Sanstead Paul
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