SuperDARN observations of daytime MSTIDs in the auroral and mid-latitudes: Possibility of long-distance propagation

Abstract

The propagation parameters of daytime medium-scale traveling ionospheric disturbances (MSTIDs) are investigated for the first time using near-simultaneous SuperDARN radar data obtained at auroral and middle latitudes. The observations suggest that MSTIDs can propagate from auroral to mid-latitudes with persistent propagation parameters if the dominant propagation direction is approximately equatorward. However, statistical analysis implies that a portion of MSTIDs with higher horizontal phase velocity are unable to reach the mid-latitude due to enhanced dissipation and the reduction of the ion-drag effect. Copyright 2008 by the American Geophysical Union.