Phase characteristics of geomagnetic micropulsations

摘要: Midlatitude geomagnetic micropulsations in the 15- to several-hundred-second period range were recorded simultaneously at stations separated a few hundred kilometers east-west and north-south directions. Diurnal patterns of phase difference between detected which station nearer dark hemisphere usually led phase. The magnitude lags is shown be function period. Although absolute velocities could not determined, dispersive properties propagation medium investigated. Apparent velocity curves constructed from measurements many micropulsation signals all hours day night. In addition, Fourier transform analysis isolated Pt type permitted determination apparent group single signals. increases with decreasing Energy Pt's associated maximum. Uncertainty proper sign prohibits deduction diurnal energy lag patterns.