Computer Science – Sound
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81..450m&link_type=abstract
Journal of Geophysical Research, vol. 81, Feb. 1, 1976, p. 450-456. Research supported by the Centre National d'Etudes Spatiale
Computer Science
Sound
Direct Current, Ionospheric Sounding, Rocket Sounding, Spinning Unguided Rocket Trajectory, Dipole Antennas, Ion Currents, Ionospheric Disturbances, Payloads, Periodic Variations, Wakes
Scientific paper
The dc current collected by a rocket-borne cylindrical probe with various bias potentials has been measured along with the plasma parameters (by in situ independent measurements on the same payload). Periodic variations synchronous with the rocket spin cycle appear; they are related to wake effects for the ion current and to both wake and ponderomotive effects for the electron current. The ion-current modulations are quantitatively explained by a theory on the wake which takes account of the angle between the velocity and the rocket axis; the electron-current modulations due to the ponderomotive field are separated from the others and quantitatively explained by simple calculations. As a by-product, the ion current outside the wake gives an unperturbed density measurement in agreement to within 15% with an independent measurement.
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