Radiative transfer effects on aurora enhanced 4.3 micron emission |
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| Institution: | 1. NASA Langley Research Center, Hampton, Virginia 23681, USA;2. University of Massachusetts, Lowell, Massachusetts 01854, USA;3. Old Dominion University, Norfolk, Virginia 23529, USA;4. University of Tennessee, Knoxville, Tennessee 37996, USA;5. NASA Johnson Space Center, Houston, Texas 77058, USA;6. University of Southern Mississippi, Hattiesburg, Mississippi 39406, USA;7. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA;8. Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia;9. Science and Technology Corporation, Hampton, Virginia 23666, USA;10. Leidos Innovations Corporation, Houston, Texas 77058, USA |
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| Abstract: | Large enhancements in the 4.3 micron infrared radiance have been observed since the early 1970's. Auroral photochemical models predict large enhancements in the populations of NO+(ν) and CO2 v3 that radiate in the 4.3 micron region. The strong 4.26 micron band of 12C16O2 is largely self-absorbed in the 90–110 km region with limb-viewing line-of-sight (LOS) optical depths at line center approaching 1000. Line-by-line calculations of the 626 isotope (001-000) transition and weak bands (636, 627, 628, and the 626 011-010 hot band) are necessary in order to calculate accurate limb spectra. The large effect of radiative transfer of the CO2 lines means that their contribution to the limb spectra compared to that of the optically thin NO+(Δν=1) lines is a sensitive function of the geometry of the auroral arc along the LOS. |
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