The sub-Brunt-Väisälä period oscillations in the ionospheric total electron content and the red 630.0 nm line intensity under the influence of short-period AGW

Details The sub-Brunt-Väisälä period oscillations in the ionospheric total electron content and the red 630.0 nm line intensity under the influence of short-period AGW The sub-Brunt-Väisälä period oscillations in the ionospheric total electron content and the red 630.0 nm line intensity under the influence of short-period AGW

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa51e..08d&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA51E-08

Physics

[0310] Atmospheric Composition And Structure / Airglow And Aurora, [2427] Ionosphere / Ionosphere/Atmosphere Interactions

Scientific paper

The presence of oscillations in the mid-latitude and equatorial total electron content (TEC), with periods smaller than the Brunt-Väisälä (BV) period (<15 min) is considered as a possible result of the influence of short-period atmospheric gravity wave (AGW) evolving in the meridional wind with zonal shear. The inclined propagation of AGW with vertical wavelength comparable to the ionosphere F2 layer scale height causes changes in the height profile of the electron density and variations in the TEC and the oxygen red 630.0 nm line intensities emitted from this region of the ionosphere. In order to demonstrate numerically the formation of short-period (<15 min) oscillations in the mid-latitude ionospheric TEC, the Chapman type height profile of the ionosphere F2 layer electron density is used, taking into account the presence of short-period AGW, which can be excited in situ, and inhomogeneous meridional wind. Such short-period oscillations in TEC mostly occur for inclined propagation of AGW while during its horizontal propagation they mostly occur with periods greater than BV period. The short-period oscillations in the TEC may also be accompanied by similar behavior of the red line intensity. The possibility of formation small period oscillations in the TEC and the red line intensity by similar mechanism at equatorial regions is also noted.

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