Study of drift and anisotropy parameters of irregularities over Patiala

148-156The results of full correlation analysis are applied to spaced fading records for daytime E-region and nighttime F-region over the period of September 1987 – July 1990. The magnitudes of apparent velocity (Va), true velocity (V) and characteristic velocity (Vc) are maximum during winter and minimum during summer for both the regions except that V is maximum during equinoxes for F-region. Orientation angle () lies mostly in the N-W quadrant and shows no significant seasonal variations. Similarly, significant diurnal variations in the drift parameters are observed during different seasons. Comparisons of drift parameters at different stations show that the true drift speed decreases systematically with increase in latitude, but the reverse is true near the poles. Systematic variations of drift and anisotropic parameters over different latitudes suggest the existence of large scale pattern of drifts over different latitudinal zones. The irregularities show different characteristics in these zones