Empirical Modeling of the Ionospheric Response to Geomagnetic Storms

Details Empirical Modeling of the Ionospheric Response to Geomagnetic Storms Empirical Modeling of the Ionospheric Response to Geomagnetic Storms

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa21a..11a&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA21A-11

Physics

2400 Ionosphere, 2431 Ionosphere/Magnetosphere Interactions (2736), 2435 Ionospheric Disturbances, 2443 Midlatitude Ionosphere, 2447 Modeling And Forecasting

Scientific paper

Understanding the response of the ionosphere to geomagnetic disturbances has reached a point where some of the F-region ionospheric characteristics can be captured in an empirical model. The integrated effect of magnetospheric energy injection during a storm disturbs the thermospheric temperature, global circulation, and neutral composition. The composition modifications accumulate over tens of hours, have a particular seasonal-latitudinal structure, and are very slow to recover. The long-lived reaction of the neutral upper atmosphere produces an ionospheric response that is consistent from storm to storm, and so enables the characteristics to be captured by an empirical model. The goal of this first empirical storm-time model is to establish a correction to the F-region peak density, or critical frequency, as a function of season and latitude for any given ap time history of a storm. Guided by the knowledge gained from previous data analysis, and from simulations with a physically-based model, observations of the F-region peak density from available sites and from many storms have been sorted by latitude and season, and by the magnitude of the storm. A coherent picture begins to emerge particularly in the summer and equinox mid-latitudes.

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