Citation: Ml. Parkinson et al., ARRIVAL OF IONOSPHERIC TROUGHS AND OBLIQUE SPREAD-F IN THE WAKE OF LARGE-SCALE TRAVELING IONOSPHERIC DISTURBANCES DURING THE INTENSE AURORAL STORMS OF AUGUST 22 AND 23, 1990, Journal of Geomagnetism and Geoelectricity, 48(11), 1996, pp. 1381-1405