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Simultaneous observations of equatorial spread F (ESF) irregularities made\udon 10 nights during March-April 1998 and 1999, using an 18-MHz radar at\udTrivandrum (77° E, 8.5° N, dip 0.5° N) and two spaced\udreceivers recording scintillations on a 251-MHz signal at Tirunelveli\ud(77.8° E, 8.7° N, dip 0.4° N), have been used to study\udthe evolution of Equatorial Spread F (ESF) irregularities. Case studies have\udbeen carried out on the day-to-day variability in ESF structure and dynamics,\udas observed by 18-MHz radar, and with spaced receiver measurements of\udaverage zonal drift Vo of the 251-MHz radio wave diffraction\udpattern on the ground, random velocity Vc, which is a measure\udof random changes in the characteristics of scintillation-producing\udirregularities, and maximum cross-correlation CI of the spaced\udreceivers signals. Results show that in the initial phase of plasma bubble\uddevelopment, the greater the maximum height of ESF irregularities responsible\udfor the radar backscatter, the greater the decorrelation is of the spaced\udreceiver scintillation signals, indicating greater turbulence. The relationship\udof the maximum spectral width derived from the radar observations and\udCI also supports this result

Simultaneous radar and spaced receiver VHF scintillation observations of ESF irregularities