Physics
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jatp...55..459m&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 55, no. 3, p. 459-465.
Physics
19
Atmospheric Ionization, Atmospheric Tides, Diurnal Variations, E Region, Ion Density (Concentration), Ion Motion, Atmospheric Circulation, Incoherent Scatter Radar, Mathematical Models
Scientific paper
The time-height trajectories of middle and upper E region Tidal Ion Layers (TILs) for early January 1989 closely resemble those from early January 1981, which first revealed the presence of a 6-h quasi-periodic intermediate layer structure. The January 1989 observations form an 'overture' to the March-May 1989 Arecibo Initiative in Dynamics of the Atmosphere (AIDA) campaign, which yielded a total of 28 days of additional data regarding TIL motion. Interestingly, the AIDA data set does not show the consistent 6-h period TIL feature seen in the two January data sets. We conclude that the basic TIL structure is controlled by two separate tidal wind patterns. We refer to these as the normal pattern and the 'deep-winter' pattern. The normal pattern includes the combination of diurnal and semidiurnal tides, while the deep-winter pattern has an additional 6-h tidal component. We suggest that the 6-h periodicity, which appears to be phase locked with the semidiurnal tide, is generated via in situ nonlinear frequency doubling of the semidiurnal tide.
Mathews John D.
Morton Yu T.
Zhou Qihou
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