The paper examines the response of the upper atmosphere parameters to the unique geomagnetic storm on January 21, 2005 at middle latitudes. Measurement data of the OI 630 and OI 557.7 nm airglow intensities, the magnetospheric pulsations and ionospheric parameter variations obtained for the Eastern Siberia region (52°N, 103°E) are used for the analysis. Penetration of the global electric field into middle latitudes, geomagnetic pulsations with periods ranging from 0.2 to 1000 s, radio wave absorption in the D ionospheric region, the occurrence of sporadic auroral-type Es formations at altitudes of 140-200 km, and an increase in the intensity of the atmospheric 630 and 557.7 nm emission were observed during this storm. It has been suggested that, in this case, the disturbance of the mid-latitude upper atmosphere parameters might have been resulted from precipitations of energetic charged particles into the ionosphere. These precipitations took place during magnetosphere compression under the influence of enhanced dynamic pressure of the solar wind.
ionospheric disturbance, airglow, geomagnetic storm, pulsations