Mathematics – Logic
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.9793o&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, June 1, 1991, p. 9793-9800.
Mathematics
Logic
9
Gravity Waves, Magnetic Storms, Middle Atmosphere, Upper Atmosphere, Atmospheric Models, F Region, Meteorological Radar, Night Sky
Scientific paper
The observation of the passage of a gravity wave over the middle and upper atmosphere (MU) radar at nighttime during the strong magnetic storm of february 6-8, 1986 was previously reported, and it is suggested that the electron density changes seen in the F layer may have been due to the existence of an influx of ionization from above and the modulation of the assimilation of this flux into the ambient ionosphere by the wave-modulated neutral atmosphere. Here, a simple, one-dimensional ionospheric model is used to investigate this possibility. A flux is imposed into the top of the ionosphere along with a temporal wavelike modulation of the neutral densities and compute the resulting equilibrium nighttime F layer density. It is found that this mechanism reproduces qualitatively the wave behavior observed with the MU radar. To match the amplitude of the waves observed, however, a combination of large changes in the background level of the neutral molecular densities and in the wave amplitudes of the neutral densities had to be imposed.
Hagan Maura E.
Oliver William L.
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