Physics
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3414103b&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 14, CiteID L14103
Physics
17
Atmospheric Composition And Structure: Thermosphere: Energy Deposition (3369), Atmospheric Processes: Thermospheric Dynamics (0358), Geodesy And Gravity: Atmosphere Monitoring With Geodetic Techniques (6952)
Scientific paper
Densities derived from accelerometer measurements on the CHAMP satellite near 400 km are used to elucidate global-scale characteristics of traveling atmospheric disturbances (TADs) in connection with 3 sudden injections of energy at high latitudes on 29 May 2003. Dayside TADs with typical amplitudes ~20-30% propagate towards the equator from the northern hemisphere (southern hemisphere) auroral region with phase speeds of order 730 ms-1 (460 ms-1). Some evidence is found for TAD penetration from the northern to the southern Hemisphere, and for the first time for trans-polar propagation. Nighttime TAD signatures are less well defined, but have phase speeds similar to the dayside TADs. The above day-night and hemisphere differences possibly reflect dependencies on direction and intensity of the prevailing solar-driven circulation, and on generation efficiency and ion drag dissipation with respect to solar zenith angle.
Bruinsma Sean L.
Forbes Jeffrey M.
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