Physics
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.1091r&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Feb. 1, 1991, p. 1091-1098.
Physics
3
Incoherent Scatter Radar, Ionic Collisions, Neutral Particles, Particle Collisions, Thermosphere, E Region, Gravity Waves, Greenland, Ohmic Dissipation
Scientific paper
Ion-neutral collision frequencies determined from measurements obtained by the inchoherent scatter radar located at Sondre Stromfjord (Greenland) have been used to derive lower thermospheric neutral densities during the First Lower Thermosphere Coupling Study (LTCS 1), September 21-26, 1987. Periods of Joule and particle heating which might disturb the E region thermal equilibrium were systematically eliminated. The mean profile of neutral density for the period is in good agreement with the mass spectrometer incoherent scatter 1986 (MSIS-86) model between 92 and 104 km. The results of a tidal analysis performed on the neutral density between 92 and 109 km show that the amplitudes of the diurnal and semidiurnal components of the tides are approximately equivalent. The observation are generally in better agreement with the MSIS-86 predictions than with the thermosphere-ionosphere general circulation model (TIGCM) simulation of the LTCS 1 interval. The observed phase of the diurnal component is approximately constant with height above 98 km and is in close agreement with the MSIS-86 model phases; however, the TIGCM diurnal phases are shifted by 6-8 hours to later local times. The phase of the semidiurnal tide is in good agreement with predictions of the MSIS-86 model and the TIGCM simulation of this interval, except near 98 km.
Johnson Mark R.
Killeen Tim L.
Reese K. W.
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