Observation and Modeling of Ionospheric Dynamics During Major Solar Flares

Details Observation and Modeling of Ionospheric Dynamics During Major Solar Flares Observation and Modeling of Ionospheric Dynamics During Major Solar Flares

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa22b..07s&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SA22B-07

Physics

2435 Ionospheric Disturbances, 2443 Midlatitude Ionosphere, 2479 Solar Radiation And Cosmic Ray Effects, 7519 Flares

Scientific paper

Ionograms from the Bear Lake Observatory dynasonde show a characteristic enhancement to the E and F1-regions during major solar x-ray flares. The virtual height of the bottom-side F-layer often increases 50-100 km within minutes while fof2 remains relatively unchanged. This effect is believed to result from a sudden increase in solar XUV flux (1-30 nm), causing rapid ionization in the E and F1 regions. By contrast, the F2 region is slower to respond. We attempt to model these dynamics and create synthetic ionograms for comparison with observations using the Time-Dependent Ionospheric Model (TDIM). For solar input to the TDIM, we build a representative flare spectrum using measurements from the Solar EUV Experiment (SEE) instrument on the TIMED spacecraft.

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