S.P. Gupta joined the Physical Research Laboratory (PRL), India, in September 1963 as a research student and worked under the guidance of Satya Prakash and Vikram Sarabhai for his PhD degree. He was involved in the design, development and manufacture of high frequency Langmuir probes. These were flown from the Thumba Equatorial Rocket Launching Station (TERLS), Trivandrum to measure in-situ the electron density, fluctuations in electron density (irregularities) and the electron temp-erature. The results led to the identification, for the first time, of the two types of plasma density irregularities associated with the cross-field and two stream instabilities. The spectral indices of the in-situ fluctuations in the scale size range from a meter to few hundreds of meters were also obtained for the first time. Based on this work he was awarded his PhD degree in 1971 from Gujarat University.
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