Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgra..11310309p&link_type=abstract
Journal of Geophysical Research, Volume 113, Issue A10, CiteID A10309
Astronomy and Astrophysics
Astrophysics
10
Atmospheric Processes: Thermospheric Dynamics (0358), Atmospheric Composition And Structure: Thermosphere: Energy Deposition (3369), Space Weather: Solar Effects, Solar Physics, Astrophysics, And Astronomy: Flares
Scientific paper
Measurements of the incoming solar extreme ultraviolet (EUV) irradiance now allow models to be driven at higher temporal resolution and with better accuracy than with proxy-based models. Using solar irradiance measurements from the Solar EUV Experiment (SEE) instrument to drive the Global Ionosphere-Thermosphere Model, the global thermospheric response to the 28 October 2003 and 6 November 2004 solar flares is presented. The model indicates that the thermospheric density at 400 km can increase by as much as 14.6% in under 2 hours because of the flare and takes 12 hours to settle to close to a nominal state. Intense dayside heating launches nightward propagating gravity waves that transport energy efficiently to the nightside at velocities near the local sound speed plus the bulk wind velocity. Measurements from the Champ satellite indicate that the simulated day to night propagation time is similar to the observed one. Substantial density enhancements occur near the midnight sector as the wave converges on itself. In some locations the nightside perturbations are as large as those on the dayside. The convergence of the wave also leads to significant adiabatic heating of the nightside thermosphere. Eventually, the wave is reflected back toward the dayside but is quickly damped.
Pawlowski David J.
Ridley Aaron J.
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