%0 Journal Article
%T The mechanism of mid-latitude Pi2 waves in the upper ionosphere as revealed by combined Doppler and magnetometer observations
%A V. A. Pilipenko
%A E. N. Fedorov
%A M. Teramoto
%A K. Yumoto
%J Annales Geophysicae (ANGEO)
%D 2013
%I Copernicus Publications
%R 10.5194/angeo-31-689-2013
%X The interpretation of simultaneous ionospheric Doppler sounding and ground magnetometer observations of low-latitude Pi2 waves is revised. We compare the theoretical estimates of the ionospheric Doppler velocity for the same amplitude of the ground magnetic disturbances produced by a large-scale compressional mode and an Alfv¨¦n mode. The plasma vertical displacement caused by the wave electric field is shown to be the dominating effect. Taking into account the correction of the previous paper, the observations of low-latitude Pi2 in the F layer ionosphere by Doppler sounding and SuperDARN (Super Dual Auroral Radar Network) radars give consistent results. We suggest that the Doppler response to Pi2 waves is produced by the Alfv¨¦n wave component, but not the fast-mode component, whereas the ground magnetic signal is composed from both Alfv¨¦n and fast magnetosonic modes.
%U http://www.ann-geophys.net/31/689/2013/angeo-31-689-2013.html