External ionospheric and thermospheric forcing during solar minimum

Details External ionospheric and thermospheric forcing during solar minimum External ionospheric and thermospheric forcing during solar minimum

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa41a1711v&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA41A-1711

Physics

[2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2437] Ionosphere / Ionospheric Dynamics, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions, [3369] Atmospheric Processes / Thermospheric Dynamics

Scientific paper

In this study we focus on dynamics of the ionosphere-thermosphere (I-T) system during a solar minimum interval. We compare and contrast the state of the I-T system during weakly disturbed high speed stream (HSS) intervals (Dst ~ -50 nT) with “quiet” days. Using GPS TEC measurements and infrared radiative power of NO and CO2 derived from SABER/TIMED measurements we study 4 HSSs that occurred during the time interval from March 20th to April 25th 2008. The study shows distinct response in the I-T system to external forcing. We attempt to trace the energy transfer and coupling from the heliosphere through the magnetosphere and into the I-T system. The GIM/JPL model is used to construct Global Ionospheric Maps using ~100 ground GPS sites. Difference global maps show local disturbances in VTEC from the “quiet” values throughout HSS intervals. Dynamics of VTEC variations in different latitude zones and LT ranges will be illustrated. Physical mechanisms for magnetosphere-ionosphere-thermosphere coupling will be discussed. The results suggest that intense Alfven waves in the HSS streams and related weak magnetic storms are causing I-T response.

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