TIMED/SABER Observations of Thermospheric 4.3 um Limb Emission: A Novel Perspective on Ionospheric E-Region Chemistry, Energetics, and Radiation Transfer for Solar-Geomagnetic Storm Periods

Details TIMED/SABER Observations of Thermospheric 4.3 um Limb Emission: A Novel Perspective on Ionospheric E-Region Chemistry, Energetics, and Radiation Transfer for Solar-Geomagnetic Storm Periods TIMED/SABER Observations of Thermospheric 4.3 um Limb Emission: A Novel Perspective on Ionospheric E-Region Chemistry, Energetics, and Radiation Transfer for Solar-Geomagnetic Storm Periods

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa13b0279m&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SA13B-0279

Other

0355 Thermosphere: Composition And Chemistry, 2407 Auroral Ionosphere (2704), 2427 Ionosphere/Atmosphere Interactions (0335), 3359 Radiative Processes, 3360 Remote Sensing

Scientific paper

Observations of thermospheric infrared emission from the TIMED-SABER instrument have fostered the development of new data products, models, and analysis tools for the study of upper atmospheric and ionospheric response to solar-geomagnetic disturbances. The focus of this paper is on analyzing SABER 4.3 um limb emission measurements to study the E-region response to solar-geomagnetic storms. Enhancements in nighttime 4.3 um emission during storm periods are due to vibrational excitation of NO+, caused by auroral electron dosing and subsequent ion-neutral chemical reactions, followed by prompt emission at 4.3 um. Since the E-region is largely inaccessible to observation on a global scale, SABER measurements provide a novel dataset for analyzing E-region chemistry, energetics, and infrared radiation transfer. The CO2 contribution to 4.3 um is removed from the SABER 4.3 um measured radiance in order to derive NO+ volume emission rates (VER), which is an excellent proxy for analyzing the E-region response to solar-geomagnetic storms and ion- neutral chemistry. NO+ 4.3 um VER is derived using SABER-retrieved temperature and density and the SABER non-LTE CO2 model and radiative transfer algorithms. Indirect auroral effects on CO2 4.3 um radiation transfer are modeled by coupling output from the field-line interhemispheric plasma (FLIP) model with the non- LTE CO2 model. FLIP simulations needed in this study are production rates of vibrationally excited N2 due to chemical reactions and inelastic electron collisions. FLIP is dynamically driven by auroral electron energy characteristics measured by the NOAA/POES satellite. Storm periods analyzed are April 2002 and October- November 2003 as well as other magnetically disturbed periods.

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