Mid-Latitude D-Region Absorption Studies in the Space Weather Context: Modeling Results

Details Mid-Latitude D-Region Absorption Studies in the Space Weather Context: Modeling Results Mid-Latitude D-Region Absorption Studies in the Space Weather Context: Modeling Results

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh51b..07e&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH51B-07

Physics

0342 Middle Atmosphere: Energy Deposition, 2419 Ion Chemistry And Composition (0335), 2447 Modeling And Forecasting, 2487 Wave Propagation (6934), 6929 Ionospheric Physics (2409)

Scientific paper

A Data-Driven D-region (DDDR) model has been created to ingest real-time geophysical data streams into a D-region electron density model for improved determinations of D-region specification with respect to HF propagation and absorption characteristics. The model is based on the disturbed D-region model of Swider and Foley ["Steady-State Multi-Ion Disturbed D-Region Model", AFGL-TR-78-0155, June 1978] for quick calculation of the global electron density profile from 60 to 100 km altitude. The model is driven by geophysical indices and ingests x-ray observations and solar wind particle observations (NOAA/GOES 12 satellite) into ionization drivers to the weather-sensitive D region model. The DDDR model and the Ionospheric Forecast Model (IFM) are run for the time period of May 25 to June 25 of 2003 and used to calculate HF signal propagation and strength from WWV, WWVH, and CHU standard time-frequency stations to the HF monitoring stations of the HF Investigation and D region Ionosphere Variation Experiment (HIDAVE). The monitoring sites are at Klamath Falls, OR and Bear Lake Observatory, UT. Day-to-day trends in HF absorption are examined in the data-model comparison as well as the D region response to solar flares from Class C to Class X.

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