Ionospheric Sensitivity to SDO-EVE Spectral Variability (Invited)

Details Ionospheric Sensitivity to SDO-EVE Spectral Variability (Invited) Ionospheric Sensitivity to SDO-EVE Spectral Variability (Invited)

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh21c..08s&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SH21C-08

Physics

[2423] Ionosphere / Ionization Processes, [7900] Space Weather, [7974] Space Weather / Solar Effects

Scientific paper

The Extreme Ultraviolet Variability Experiment (EVE) instrument on NASA’s Solar Dynamics Observatory (SDO) satellite provides for the first time a 24/7 stream of space weather data for the ionosphere-thermosphere (I-T) communities. Already this data stream of 1-minute cadence has revealed previously unknown levels of complexity in the solar flare EUV dynamics, even though at the time of writing the solar flares remain modest in magnitude. This data provides a new ionospheric time dependent energy and ionization driver. The Utah State University Time Dependent Ionospheric Model (TDIM) is used to simulate the ionosphere’s sensitivity to this new driver. The TDIM is a full-physics model that uses empirical representations of the thermosphere and magnetosphere. The TDIM studies to be presented will be of two types: 1) determination of the ionosphere’s altitude response to time variations in the full EVE spectrum; and 2) time dependent ionospheric responses to specific EVE flare dynamics. The latter study will focus on aspects of space weather relevance, specifically the timing, duration, and magnitude of effects in the E- and F-regions. Given that the new SDO EVE observations have revealed that certain EUV wavelengths have delayed onsets of about 30 minutes, the ionospheric response will be similarly delayed. This has the potential to add complexity to the assimilation of the solar EUV data into models of the ionosphere and thermosphere. The new EVE-TDIM simulations will be used to assess how well empirical/hybrid pre-SDO-EVE solar spectra drove the ionospheric model in the past.

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