Solar semidiurnal tide in the thermosphere

Details Solar semidiurnal tide in the thermosphere Solar semidiurnal tide in the thermosphere

Jan 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jats...33..135h&link_type=abstract

Journal of the Atmospheric Sciences, vol. 33, Jan. 1976, p. 135-153. Research supported by the U.S. Defense Nuclear Agency

Mathematics

Logic

10

Atmospheric Tides, Diurnal Variations, Solar Activity Effects, Solar Heating, Thermosphere, Atmospheric Models, Far Ultraviolet Radiation, Gravity Waves, Radiation Effects, Sunspots, Three Dimensional Models, Vertical Distribution

Scientific paper

The behavior of the solar semidiurnal tide in the thermosphere is studied on the basis of a three-dimensional model involving viscosity, thermal conductivity, Coriolis effects, sphericity of the earth, and ion drag. Sources of excitation are absorption of solar radiation by H2O and O3 below the mesopause, and by O2 in the Schumann-Runge continuum (SRC), and O, O2, N2 in the extreme ultraviolet (EUV), in the thermosphere. The relative importance of EUV, SRC, and forcing below the thermosphere are assessed. The semidiurnal tide in the lower thermosphere is re-examined, and the utility of equivalent gravity mode calculations is evaluated. The calculations presented provide detailed predictions for all meteorological fields as functions of season, solar cycle, and other parameters. In particular, the semidiurnal tide between 100 and 130 km is dominated by the 2,4 mode excited below the thermosphere. During sunspot minimum, forcing from below is dominant, but during sunspot maximum tides from below are so severely attenuated within the thermosphere that thermospheric in situ forcing becomes relatively more important. Results are compared with tidal observations at 45 deg latitude.

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