1979
DOI: 10.1029/ja084ia06p02743
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Upper atmosphere tides and the vertical motion of ionospheric sporadic layers at Arecibo

Abstract: The vertical motion of ionospheric sporadic layers in the 80‐ to 140‐km altitude region is examined by using a numerical solution for ion trajectories in a wind system composed of diurnal and semidiurnal tides similar to those observed at Arecibo. The confluence of the two tides in the 100‐ to 110‐km altitude region is shown to produce a variety of layer motion possibilities including ‘quasi‐stagnation’ of the layer as well as rapid upward or downward motions. Experimental layer trajectories are presented whic… Show more

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Cited by 134 publications
(106 citation statements)
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“…Among these modes, the S(2,4) mode propagates more freely in the lower thermosphere (E-region), because the layers (the semi-diurnal tide) are concentrated in the 100-140 km region, which is located in the lower ionosphere and in which temperature decreases with height (Williams, 1996). Furthermore, these average descent rates are consistent with the theoretical S(2,4) mode described by Fujitaka and Tohmatsu (1973) and Mathews and Bekeny (1979). Therefore, it can be treated as the S(2,4) mode with a vertical wavelength of ∼50 km (Bernard and Spizzichino, 1971;Fujitaka and Tohmatsu, 1973;Williams, 1996).…”
Section: Discussionsupporting
confidence: 80%
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“…Among these modes, the S(2,4) mode propagates more freely in the lower thermosphere (E-region), because the layers (the semi-diurnal tide) are concentrated in the 100-140 km region, which is located in the lower ionosphere and in which temperature decreases with height (Williams, 1996). Furthermore, these average descent rates are consistent with the theoretical S(2,4) mode described by Fujitaka and Tohmatsu (1973) and Mathews and Bekeny (1979). Therefore, it can be treated as the S(2,4) mode with a vertical wavelength of ∼50 km (Bernard and Spizzichino, 1971;Fujitaka and Tohmatsu, 1973;Williams, 1996).…”
Section: Discussionsupporting
confidence: 80%
“…The mechanism for this phenomenon may be that the downward plasma transport stops near that altitude of the possible dumping level (Chimonas and Axford, 1968). The 100-105 km (virtual height) estimated directly from ionograms in this work closely approaches the dumping level of 100 km (real height) of the downward semi-diurnal tide identified by Chimonas and Ax-ford (1968) and Mathews and Bekeny (1979).…”
Section: Discussionsupporting
confidence: 52%
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“…These results supported the hypothesis that E s is caused by the accumulation of metallic ions in convergent nulls in the vertical ion drift associated with neutral wind pro®les. Mathews and Bekeny (1979) approached the problem by computing ion trajectories consistent with descending tidal wind structures in the E-region, and demonstrating the existence of descending and stagnation phases of ion motion. These studies did not consider the eects of diusion, gravity, electric ®elds, metallic and ambient ion chemistry, or any serious consideration of the metallic ion source.…”
Section: Laboratory Measurements Of Reaction Rates and Previous Theomentioning
confidence: 99%