TitleInfluence of solar-geomagnetic disturbances on SABER measurements of 4.3μm emission and the retrieval of kinetic temperature and carbon dioxide
Publication TypeJournal Article
Year of Publication2009
AuthorsMertens, CJ, Winick, JR, Picard, RH, Evans, DS, López-Puertas, M, Wintersteiner, PP, Xu, X, Mlynczak, MG, Russell, JM
JournalAdvances in Space Research
Volume43
Start Page1325
Pagination1325–1336
Abstract

Thermospheric infrared radiance at 4.3 μm is susceptible to the influence of solar-geomagnetic disturbances. Ionization processes followed by ion-neutral chemical reactions lead to vibrationally excited NO+ (i.e., NO+(v)) and subsequent 4.3 μm emission in the ionospheric E-region. Large enhancements of nighttime 4.3 μm emission were observed by the TIMED/SABER instrument during the April 2002 and October–November 2003 solar storms. Global measurements of infrared 4.3 μm emission provide an excellent proxy to observe the nighttime E-region response to auroral dosing and to conduct a detailed study of E-region ion-neutral chemistry and energy transfer mechanisms. Furthermore, we find that photoionization processes followed by ion-neutral reactions during quiescent, daytime conditions increase the NO+ concentration enough to introduce biases in the TIMED/SABER operational processing of kinetic temperature and CO2 data, with the largest effect at summer solstice. In this paper, we discuss solar storm enhancements of 4.3 μm emission observed from SABER and assess the impact of NO+(v) 4.3 μm emission on quiescent, daytime retrievals of Tk/CO2 from the SABER instrument.



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