Energetic and dynamic impact on the upper atmosphere during the April 2002 geomagnetic storm

Details Energetic and dynamic impact on the upper atmosphere during the April 2002 geomagnetic storm Energetic and dynamic impact on the upper atmosphere during the April 2002 geomagnetic storm

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm42d..06l&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM42D-06

Physics

2427 Ionosphere/Atmosphere Interactions (0335), 2431 Ionosphere/Magnetosphere Interactions (2736), 2437 Ionospheric Dynamics, 2736 Magnetosphere/Ionosphere Interactions

Scientific paper

The April 2002 geomagnetic storm has been associated with a wide range of disturbances that occurred on the Sun, including high-speed coronal mass ejections, and several M- and X-class flares. This event therefore offers a unique opportunity to define and unravel the geoeffectiveness of various energy inputs originating from the Sun. This talk focuses on the impact of precipitating particles on the upper atmosphere. Numerical experiments are carried out to study the response of the thermosphere and ionosphere to the different particle inputs, such as the auroral electrons and energetic protons, and the intense high-energy polar rain that was observed during the storm. We also show the generation and propagation of the large-scale traveling atmospheric and ionospheric disturbances (TADs and TIDs) and their relation to the impulsive magnetospheric energy inputs via precipitating particles and Joule heating. Storm-time changes in neutral temperature, neutral winds and composition, as well as electron density will be discussed in light of the model simulations.

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