Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa33a1615f&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA33A-1615
Other
0355 Thermosphere: Composition And Chemistry, 0358 Thermosphere: Energy Deposition (3369), 2419 Ion Chemistry And Composition (0335), 2427 Ionosphere/Atmosphere Interactions (0335), 2441 Ionospheric Storms (7949)
Scientific paper
The TIMED/SABER instrument is a multi-channel radiometer that measures limb emission in the MLTI region. At night, 4.3um emission is used to estimate NO+(v) Volume Emission Rates (VER) at E-region altitudes. NO+(v) VER can be derived by removing the background CO2(nu3)4.3 um radiance contribution using SABER-based non-LTE radiation transfer models, and by performing a standard Abel inversion on the residual radiance. SABER observations show that NO+(v) VER is significantly enhanced during magnetic storms in accordance with increased ionization of the neutral atmosphere by auroral electron precipitation, followed by vibrational excitation of NO+ (i.e., NO+(v)) from fast exothermic ion-neutral reactions, and prompt infrared emission at 4.3 um. Due to charge neutrality, the NO+(v) VER enhancements are highly correlated with electron density enhancements, as observed for example by Incoherent Scatter Radar (ISR). In order to characterize the response of the storm-time E-region from both TIMED/SABER and ISR measurements, a Storm/Quiet ratio (SQR) parameter is defined as a function of altitude. For TIMED/SABER, the SQR is the ratio of storm-to-quiet NO+(v) VER. Similarly, SQR is the storm- to-quiet ratio of electron densities for ISR. In this work, we compare TIMED/SABER and ISR SQR values for different magnetic storm events seasonally distributed. Preliminary results indicate a good correlation between TIMED/SABER and ISR SQR values particularly between 100 to 120 km. SQR values are intended to be used as a correction factor to be included in an empirical storm-time correction to the International Reference Ionosphere model at E-region altitudes.
Bilitza Dieter
Fernandez Javier
Mertens Chris J.
Mlynczak Martin G.
Russell James M.
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