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Investigations of the AC electric fields associated with plasma instabilities in the equatorial electrojet were carried out from Thumba using Langmuir double probes. AC electric fields, the electrojet current density and the electron density and its fluctuations were measured in near simultaneous launchings on two different occasions near local noon when the electrojet intensity was high. A third experiment was conducted in the early morning hours when the electrojet was not yet developed. The two noon time experiments detected AC electric fields associated with cross field instability, both during the ascent and the descent, between 85 and 105 km altitude. In the early morning experiment AC electric fields in the spectral band 10-100 Hz were observed between 115 and 130 km altitude.

AC electric fields associated with the plasma instabilities in the equatorial electrojet. III.