An upper E region quarterdiurnal tide at Arecibo?

Details An upper E region quarterdiurnal tide at Arecibo? An upper E region quarterdiurnal tide at Arecibo?

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....9310047t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Sept. 1, 1988, p. 10047-10051.

Physics

5

Atmospheric Models, Atmospheric Tides, Diurnal Variations, E Region, Ionospheric Ion Density, Wind Shear, Computerized Simulation, F Region, Puerto Rico, Steady State, Upper Atmosphere

Scientific paper

Studies of the time-height trajectories of ionosphere E region layers at Arecibo have revealed not only the usual diurnal sporadic-E and semidiurnal intermediate layer structures but also that on occasion, extra layers form and descend through the E region. In particular, during January 1981, four layers per day were observed to descend through the upper E region. This four-per-day layer system was remarkably coherent over the 3 days of observation and suggests the existence of a 6-hour period or quarterdiurnal tidal wind system in the upper E region. Numerical simulations of ion trajectories in a realistic model atmosphere with diurnal, semidiurnal, and quarterdiurnal tidal wind systems of appropriate amplitude and phase structures confirm that the presence of a quarterdiurnal tide is sufficient to explain the observations.

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