Gravity wave generation and propagation during geomagnetic storms over Kiruna (67.8°N, 20.4°E)

• Main Authors: P. R. Fagundes, A. L. Aruliah, D. Rees, J. A. Bittencourt
• Format: Article in Journal/Newspaper
• Language: English
• Published: Copernicus Publications
• Subjects: Science; Q; Physics; QC1-999; Geophysics. Cosmic physics; QC801-809; Kiruna
• Online Access: https://doaj.org/article/cecc4c6f9c1741908bb1390c6eb15007

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.