Articles | Volume 13, issue 4
Ann. Geophys., 13, 358–366, 1995
https://doi.org/10.1007/s00585-995-0358-7
Ann. Geophys., 13, 358–366, 1995
https://doi.org/10.1007/s00585-995-0358-7

  30 Apr 1995

30 Apr 1995

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

P. R. Fagundes, A. L. Aruliah, D. Rees, and J. A. Bittencourt P. R. Fagundes et al.

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.