Meridional Mapping of Mesospheric Temperatures from CO 2 Emission along the MGS Ground Track T. A. Livengood 1, T. Kostiuk, K. E. Fast, J. N. Annen, G.

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Presentation transcript:

Meridional Mapping of Mesospheric Temperatures from CO 2 Emission along the MGS Ground Track T. A. Livengood 1, T. Kostiuk, K. E. Fast, J. N. Annen, G. Sonnabend, T. Hewagama 1 Challenger Center

Observations were made with the Heterodyne Instrument for Planetary Wind And Composition (HIPWAC), an instrument built at the Goddard Space Flight Center. This instrument uniquely provides a resolving power of 10 6 at 10 microns. This allows: Measurement of gas velocities (winds) to ~2 m/sec from Doppler shifts of emitted spectral lines. Retrieval of atmospheric temperature and molecular abundance from true line shapes. HIPWAC on the IRTF

The observations presented here were obtained on 4 nights in June CO 2 hot band and non-thermal (lasing) transitions were observed. This provided constraints on tropospheric temperature profile. Observations were also obtained along the Mars Global Surveyor ground track, allowing for direct comparison of the ground-based and spacecraft measurements. 16 O 12 C 18 O cm –1 P12 CO 2 at 30° S cm –1 P34 CO 2 at Equator Non-Thermal Emission Core Tropospheric Absorption Feature — flat-bottomed due to stratospheric self-emission Tropospheric Absorption Feature — CO 2 Hot Band Transition No Emission Core

June °S 30°S 15°N 45°N 626P cm –1 75°S 60°S 15°S Equator 30°N

626P cm –1 626P cm –1 626P cm –1 626P cm –1 626P cm –1 626P cm –1 628 CO Hot-Band and Isotopic CO 2 Transitions at the Equator Note: 626 = 16 O 12 C 16 O, 628 = 16 O 12 C 18 O

1. Mission support. IR heterodyne spectroscopy of Mars supports the Mars Global Surveyor, Mars Odyssey, and Mars Exploration Rover missions that currently are exploring Mars. The flight missions do not support high spectral resolution, so HIPWAC provides an important test of atmospheric properties inferred from flight instrumentation. 2. Mesospheric probe. The non-thermal emission by CO 2 in Mars’ mesosphere (~65 km and higher) provides information on temperature and energy balance in this region. An understanding of the physical processes in the mesosphere is important in deducing how the atmosphere of Mars evolved from its primordial condition to the present. 3. Unique phenomena. Non-thermal emission by carbon dioxide in the upper atmosphere is a property unique to the Earth-like terrestrial planets in our solar system. (Whether the Earth itself exhibits similar phenomena is unknown.) Non-thermal emission from extrasolar planets may be a useful tool in the future. Relevance to current research on Mars: