Computer Science – Sound
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91..249c&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Jan. 1, 1986, p. 249-258.
Computer Science
Sound
35
Airglow, Digital Simulation, F Region, Ionospheric Sounding, Plasma Density, Plasma Drift, Caribbean Region, Daytime, Finite Element Method, Night Sky, Photoionization
Scientific paper
Numerical simulations of the F region ionosphere over Arecibo, Puerto Rico, are presented. It is deduced from these simulations that the dynamic behavior of the Arecibo ionosphere, particularly the so-called 'midnight collapse' phenomenon, is strongly influenced by the upward propagating semidiurnal tidal component of the neutral meridional wind excited below thermospheric levels. Presence of a terdiurnal component in the wind field improves the agreement with experiment and could result from nonlinear interactive coupling between the neutral wind and ion drag. The steep underside density gradients occurring in conjunction with the collapse are due to vertical shear in the meridional wind field associated with the propagating semidiurnal tide. These gradients are capable of triggering the gradient drift instability, thus accounting for plasma irregularity formation and observations of VHF scintillations associated with the collapse phenomenon.
Crary David J.
Forbes Jeffrey M.
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