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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 24, issue 5
Ann. Geophys., 24, 1419–1427, 2006
https://doi.org/10.5194/angeo-24-1419-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: The 11th International Symposium on Equatorial Aeronomy (ISEA-11),...

Ann. Geophys., 24, 1419–1427, 2006
https://doi.org/10.5194/angeo-24-1419-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.

  03 Jul 2006

03 Jul 2006

Simultaneous radar and spaced receiver VHF scintillation observations of ESF irregularities

D. Tiwari1, B. Engavale1, A. Bhattacharyya1, C. V. Devasia2, T. K. Pant2, and R. Sridharan2 D. Tiwari et al.
  • 1Indian Institute of Geomagnetism, Plot No. 5, Sector-18, New Panvel (W) New Mumbai- 410218, India
  • 2Space Physics Laboratory, Vikram Sarabhai Space Centre Thiruvananthapuram-695022, India

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

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