Radio star and satellite signal scintillation by E region irregularities: A case study


  • Hari Om Vats,

  • Harish Chandra,

  • M. R. Deshpande,

  • G. D. Vyas


Here we present the study of daytime scintillation due to E region irregularities at low latitudes from a set of simultaneous observations on June 3, 1993. The effects of these irregularities are clearly seen on (1) the 103 MHz signal of the radio star 3C 196 recorded at Rajkot and at Thaltej (near Ahmedabad, India), (2) the 244-MHz radio beacon of Fleetsat satellite (73°E) recorded at Ahmedabad, and (3) the ionosonde being operated at Ahmedabad. These observations provide an estimate of the irregularity patch with a spatial extent of around 400 km east-west and 80 km north-south. As the subionospheric points of the radio source and satellite observations are quite far apart, a study on the dynamics of these irregularities is also possible which indicates a southward movement of the patch. The drift speed of ∼ 60 m/sec is calculated from the upper frequency roll off of the scintillation spectrum at 103 MHz. This is found to be consistent with earlier investigations of blanketing Es near magnetic equator.