Monitoring of Sudden Ionospheric Disturbances (SID) from Kolkata (INDIA)
  We report our first results of monitoring sudden ionospheric disturbances (SID). We present data taken continuously for two weeks during 20th Sept. 2002 and 4th Oct. 2002. We compare the effects of solar flares of the VLF signal with those obtained by GOES Satellite of NASA monitoring in X-rays and found excellent agreement. 
Sandip K. Chakrabarti, K. Acharyya, B. Bose, S. Mandal, A. Chatterjee,   N.M. Nandi, S. Pal, and R. Khan