Measurement of OII 61.7 nm and implications for daytime ionospheric remote sensing

Details Measurement of OII 61.7 nm and implications for daytime ionospheric remote sensing Measurement of OII 61.7 nm and implications for daytime ionospheric remote sensing

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa13b1893s&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA13B-1893

Physics

[0310] Atmospheric Composition And Structure / Airglow And Aurora, [2423] Ionosphere / Ionization Processes, [2494] Ionosphere / Instruments And Techniques

Scientific paper

We present the first measured altitude profiles of the OII 61.7 nm dayglow emission, a feature that can be used to monitor photoionization of atomic oxygen in the lower thermosphere. It has been shown by Picone [2008] that accurate knowledge of this process is important to avoid biases in ionospheric densities determined from remote sensing algorithms that use the related OII 83.4 nm emission. While modeling analysis can provide some useful constraints, measuring the 61.7 nm emission is a more direct method to obtain the intensity of this source that illuminates the ionosphere from below. The measurements for this study were collected by the Remote Atmospheric and Ionospheric Detection System (RAIDS) from the International Space Station on 29 October 2009. The RAIDS data show a drop in intensity from the emission peak tangent altitude near 250 km down to 150 km that is a factor of two larger compared to what is expected based on model calculations of the emission profile. This discrepancy can be eliminated by increasing the effective photoabsorption by neutral species at these lower altitudes. In test cases that modified just O2, a 35% change was needed to match the observed profile. Smaller, individual changes to N2 and O can provide qualitative agreement at lower altitudes but also force changes in the emission peak altitude that are not clearly reflected by the RAIDS data. This could be resolved with simultaneous measurement of the neutrals, or a higher sensitivity measurement of the 61.7 nm profile from a vantage point well above the emission peak. Until those measurements are made, accurate specification of all three neutral species remains an important component of daytime ionospheric remote sensing.

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