SABER NO+(v) Volume Emission Rates and Magnetic Indices Correlation Comparisons for Magnetic Storm Events

Details SABER NO+(v) Volume Emission Rates and Magnetic Indices Correlation Comparisons for Magnetic Storm Events SABER NO+(v) Volume Emission Rates and Magnetic Indices Correlation Comparisons for Magnetic Storm Events

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsa54a..04f&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SA54A-04

Physics

2407 Auroral Ionosphere (2704), 2419 Ion Chemistry And Composition (0335), 2427 Ionosphere/Atmosphere Interactions (0335), 2435 Ionospheric Disturbances, 2441 Ionospheric Storms (7949)

Scientific paper

The TIMED/SABER instrument is a broadband emission radiometer with ten channels that measure limb emission from the MLTI region. Of particular interest for this study is the use of nighttime auroral 4.3 um limb emission, which is primarily due to vibrationally excited NO+, caused by ion-neutral chemical reactions. From the SABER 4.3 um limb emission measurements, the NO+(v) Volume Emission Rate (VER) is derived by removing the background CO2 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 and can be used as a proxy to correct the International Reference Ionosphere (IRI) model E-region electron density for magnetic storm events. The correction procedure uses an impulse response function which is convolved with an appropriate geomagnetic driver index. The result in a correction factor that will scale the nominal IRI model E-region electron density. In order to determine the appropriate magnetic driver index, we study the cross correlations between SABER NO+(v) VER and different geomagnetic driver indices such as HP, Kp, Ap, AE, and Dst for different magnetic storm events.

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