Vertical Characteristics of Travelling Ionospheric Disturbances

Abstract

SummaryThe vertical dimensions of travelling disturbance phenomena have been investigated by derivation of the associated true height distributions of ion density. The height at which they appear often has an upper limit which may fluctuate in height from day to day.It appears that direction of travel is related mainly to season, with the possibility of some additional form of solar control only evident at times of sunspot maximum.During a particular season, there is no obvious change of direction of travel with height in the height range under observation.No definite variation of speed with height is evident in the ionospheric region considered, which extends from 160 to 230 km.