Computer Science – Sound
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979p%26ss...27..145g&link_type=abstract
(International Congress on Waves and Instabilities in Plasmas, 3rd, Palaiseau, Essonne, France, June 27-July 1, 1977.) Planetary
Computer Science
Sound
2
Electrostatic Probes, Nike-Apache Rocket Vehicle, Plasma Interactions, Plasma Oscillations, Rocket Sounding, Ionospheric Sounding, Plasma Density, Wakes
Scientific paper
Several Nike-Apache rockets with Langmuir probe payloads were launched from Thumba (India) to study the disturbances produced by a moving rocket. The rockets were launched during different times of the day and night. It was found that low frequency ion plasma oscillations of the order of 1 kHz frequency were observed in the altitude region 145 to 200 km. This altitude region corresponds to the rocket apogee region where the rocket velocity is subsonic. The amplitude of the fluctuations was about 1 to 2% and was found to depend on rocket velocity electron density in the ambient medium, rocket spin and probe voltage. It was noticed that in the case of Centaure and Petrel rockets such types of oscillations were not observed. The Nike-Apache rockets are made of aluminum while Centaure and Petrel rockets are made of stainless steel.
Gupta S. P.
Prakash Suprabh
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