Rocket experiment on spontaneously and artificially stimulated VLF plasma waves in the ionosphere

Details Rocket experiment on spontaneously and artificially stimulated VLF plasma waves in the ionosphere Rocket experiment on spontaneously and artificially stimulated VLF plasma waves in the ionosphere

Jul 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.2829m&link_type=abstract

Journal of Geophysical Research, vol. 80, July 1, 1975, p. 2829-2834.

Computer Science

Sound

Ionospheric Propagation, Particle Interactions, Plasma Waves, Rocket Sounding, Wave Interaction, Ion Acoustic Waves, Ionospheric Sounding, Spontaneous Emission, Stimulated Emission, Upper Ionosphere, Very Low Frequencies

Scientific paper

In situ active experiments on the nonlinear wave-wave and wave-particle interactions in the ionospheric plasma were performed by a Japanese sounding rocket K-9M-41. Both spontaneously and artificially stimulated plasma waves in the VLF range were observed. When a large amplitude electron plasma wave was transmitted from the rocket, parametrically excited ion acoustic waves were observed in addition to natural emissions such as whistlers, LHR emissions, and hisslike emissions. It was also found that 'risers' were triggered by the LHR emissions, which seem to be very similar to a phenomenon of the so-called ASE (artificially stimulated emissions). When a slow electron beam with energy lower than 3 eV was ejected from the rocket, a new type of periodic U-shaped discrete emission was observed which was excited through a wave-particle interaction. The frequency of these emissions is lower than the LHR frequency and decreases as the beam energy is increased. Spectrograms of the observed plasma waves are presented, and some are analyzed theoretically.

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