Gravity wave generation and propagation during geomagnetic storms over Kiruna (67.8°N, 20.4°E) |
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Authors: | P R Fagundes A L Aruliah D Rees J A Bittencourt |
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Institution: | (1) Instituto Nacional de Pesquisas Espaciais-INPE, C.P. 515, 12201-970, São José dos Campos, Brazil;(2) Atmospheric Physics Laboratory, University College London, 67-73 Riding House Street, London, W1P 7PP, U.K. |
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Abstract: | Atmospheric gravity waves, detected over Kiruna (67.8°N, 20.4°E) during geomagnetic storms, are presented and analysed. The data include direct measurements of the OI 630.0 nm emission line intensity, the x-component of the local geomagnetic field and thermospheric (meridional and zonal) wind velocities derived from the OI 630.0 nm Doppler shift observed with an imaging Fabry-Perot interferometer (IFPI). A low pass band filter technique was used to determine short-period variations in the thermospheric meridional wind velocities observed during geomagnetic storms. These short-period variations in the meridional wind velocities, which are identified as due to gravity waves, are compared to the corresponding variations observed in the OI 630.0 nm emission line intensity, x-component of the local geomagnetic field and the location of the auroral electrojet. A cross-correlation analysis was used to calculate the propagation velocities of the observed gravity waves. |
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