Physics
Scientific paper
May 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.1880r&link_type=abstract
Journal of Geophysical Research, vol. 84, May 1, 1979, p. 1880-1890.
Physics
12
Energy Dissipation, Gravity Waves, Thermosphere, Wave Excitation, Atmospheric Physics, Computerized Simulation, Earth Ionosphere, Kinetic Energy, Magnetic Storms, Potential Energy
Scientific paper
The characteristics of the generation and dissipation of energy by large amplitude gravity waves in the thermosphere are evaluated in order to clarify the conditions under which gravity waves may be a significant mechanism of energy transport. Wave energy is defined as a property closely related to the sum of kinetic energy and available potential energy in the atmosphere, and which is approximately conserved in the absence of production or dissipation mechanisms. Simulations of gravity responses to a magnetic substorm and to the magnitude and direction of the auroral current using a numerical model of thermosphere dynamics demonstrate that both the Lorentz force and the Joule heating of auroral currents can generate substantial gravity wave energy, but that the waves generated by Joule heating are more capable of propagating to middle and low latitudes. The simulations also reveal that molecular dissipation may be less important in the daytime dissipation of large scale gravity waves at middle latitudes than Joule dissipation.
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