Physics
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.7466m&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 93, July 1, 1988, p. 7466-7477.
Physics
20
Atmospheric Circulation, Diurnal Variations, Geomagnetism, Ionospheric Temperature, Polar Caps, Thermosphere, Auroral Zones, Emission Spectra, Fabry-Perot Interferometers, Line Spectra, Northern Hemisphere, Ohmic Dissipation, Resistance Heating, Spectral Resolution
Scientific paper
High-spectral-resolution measurements of the O(1D) emission line, performed with the Fabry-Perot interferometer (Thule, Greenland), were used to observe the diurnal variation of the thermospheric temperature in the geomagnetic polarcap at solar minimum (January 1987). By tracing the trajectory of a parcel backward in time and space from the Thule location, it is shown that the observed diurnal temperature variation is due to the degree of solar heat input that a parcel experiences en route to the polar cap, and the route a parcel takes through the polar cusp. It is also shown that the hydrodynamic variations in the winter high-latitude regions from solar maximum to solar minimum are insufficient to mask the thermodynamical effects associated with the offset of the geographic and geomagnetic poles.
Burns Alan G.
Killeen Tim L.
McCormac F. G.
Meriwether W. Jr. J.
Roble Raymond G.
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