HR: 14:55h
AN: SM42D-06 [PDF]
TI: Energetic and dynamic impact on the upper atmosphere
during the April 2002 geomagnetic storm
AU: * Lu, G
EM: ganglu@ucar.edu
AF: National Center for Atmospheric Research, 3450 Mitchell Lane, Boulder, CO 80307 United States
AU: Roble, R
EM: roble@ucar.edu
AF: National Center for Atmospheric Research, 3450 Mitchell Lane, Boulder, CO 80307 United States
AU: Richmond, A
EM: richmond@ucar.edu
AF: National Center for Atmospheric Research, 3450 Mitchell Lane, Boulder, CO 80307 United States
AU: Immel, T
EM: immel@ssl.berkeley.edu
AF: Space Sciences Laboratory, University of California, Centennial@Grizzly Peak, Berkeley, CA 94720 United States
AU: Lummerzheim, D
EM: lumm@gi.alaska.edu
AF: Geophysical Institut, University of Alaska, 903 Koyukuk Drive, Fairbanks, AK 99775 United States
AU: Galand, M
EM: mgaland@pocc.bu.edu
AF: Center for Space Physics, Boston Universtity, 725 Commonwealth Avenue, Boston, MA 02215 United States
AB:
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.
DE: 2427 Ionosphere/atmosphere interactions (0335)
DE: 2431 Ionosphere/magnetosphere interactions (2736)
DE: 2437 Ionospheric dynamics
DE: 2736 Magnetosphere/ionosphere interactions
SC: SPA - Magnetospheric Physics [SM]
MN: 2003 Fall Meeting