Response of NO radiative cooling, and ionospheric parameters in MLTI-region during multiple geomagnetic events
| Autor: | Ranjan, A., Sunil Krishna, M., Kumar, A., Sarkhel, S. |
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| Rok vydání: | 2023 |
| Zdroj: | XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
| DOI: | 10.57757/iugg23-0776 |
| Popis: | The response of NO infrared radiative cooling (NOIRC) in lower thermosphere during geomagnetic events has been extensively reported in the recent past. However, its response to continuously occurring multiple geomagnetic events can be puzzling. In our study, we report the TIMED/SABER observed NOIRC response to the complicated Halloween storms, which were comprised of three intense-geomagnetic storms. The variability of NOIRC during these storm events and its connection to the strength and duration of the geomagnetic storms is different than isolated geomagnetic events. TIMED/GUVI O/N2 correlation with both NOIRC, and Total electron content (TEC) are investigated during these intense events. The response of NOIRC to storm associated HILDCAAs (High Intensity Long Duration Continuous Auroral Activities) events (11-17 April 2005, 5-10 December 2006) is also investigated. Although, the energy coupling between solar-wind and magnetosphere is stronger during main phase, both the heating and NOIRC are maximum during the associated HILDCAA event in the recovery phase of these storms. The strength of NOIRC is mainly attributed to the variation in temperature, atomic oxygen, and NO abundances during all the space weather events. Comprehensive thermospheric-ionospheric numerical models, such as TIE-GCM and WACCM-X estimate a good correlation between NO density, its collisional excitation rate through O, and subsequent emission rate, with the SABER observations of NOIRC. The occurrence of continuous substorm induced energetic particle precipitation during HILDCAAs and its effect on the auroral and equatorial ionospheric electron density are also investigated. A comprehensive understanding based on all these results will be discussed in our presentation. The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) |
| Databáze: | OpenAIRE |
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