Solar Energy and Nitric Oxide in the Lower Thermosphere: Observations by the Remote Atmospheric Ionospheric Detection System (RAIDS) and the Solar Dynamic Observatory (SDO)

Details Solar Energy and Nitric Oxide in the Lower Thermosphere: Observations by the Remote Atmospheric Ionospheric Detection System (RAIDS) and the Solar Dynamic Observatory (SDO) Solar Energy and Nitric Oxide in the Lower Thermosphere: Observations by the Remote Atmospheric Ionospheric Detection System (RAIDS) and the Solar Dynamic Observatory (SDO)

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa51c1959l&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA51C-1959

Physics

[0355] Atmospheric Composition And Structure / Thermosphere: Composition And Chemistry, [7974] Space Weather / Solar Effects

Scientific paper

Nitric oxide (NO) is a minor constituent of the lower thermosphere which plays numerous key roles there. Its production is very sensitive to those energy sources able to break the strong molecular nitrogen bond. Thus, NO concentrations are indicative of energy deposition. Cooling through infrared NO emission is a crucial part of the thermospheric energy balance. NO is also the terminal ion in the E-region of the ionosphere. If NO is transported to lower altitudes, it is a catalytic destroyer of ozone. The Remote Atmospheric and Ionospheric Detection System (RAIDS) is a suite of limb viewing radiance monitors observing the lower thermosphere at wavelengths from the EUV through the NIR. An inverse technique is applied to radiance profiles near 237 nm, which contain fluorescence emission on the NO gamma (0,1) band, so that the vertical profile of NO density can be determined. One of the key advantages of RAIDS NO observations compared to previous experiments is that RAIDS is deployed on the International Space Station and thus is able to observe NO concentrations at all sunlit local times. In addition, launched in February of 2010, the EUV Variability Experiment (EVE) on the Solar Dynamic Observatory (SDO) provides solar soft X-ray and EUV measurements with unprecedented spectral resolution (0.1 nm), temporal cadence (10 seconds), and accuracy (20%). This provides the opportunities for monitoring the variation of nitric oxide in the lower thermosphere with the fluctuation of the solar soft X-ray energy. By doing so, we are able to understand better and to quantify the relationship between solar energy input and NO production and constrain the photochemistry.

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