Observation of suprathermal electron fluxes during ionospheric modification experiments

Details Observation of suprathermal electron fluxes during ionospheric modification experiments Observation of suprathermal electron fluxes during ionospheric modification experiments

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.3441f&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, April 1, 1987, p. 3441-3444.

Physics

8

Doppler Effect, Electron Flux Density, High Frequencies, Hot Electrons, Ionospheric Ion Density, Photoelectrons, Airglow, Electron Acceleration, Maxwell-Boltzmann Density Function, Oxygen Atoms, Thermal Plasmas

Scientific paper

The temporal behavior of backscatter by ionospheric Langmuir waves was observed with the 430-MHz radar at Arecibo while a powerful HF wave was cycled 2 s on, 3 s off. Late at night, in the absence of photoelectrons, using an HF equivalent radiated power of 80 MW at 3.175 MHz, the initial enhancement of about 6 percent above system noise of the backscattered power with Doppler shifts between -3.75 and -3.85 MHz was reached about 0.25 s after switching on the HF transmitter. In the following second the enhancement gradually decreased to about 3 percent and remained there until switching off. During the late afternoon, in the presence of photoelectrons, using the same HF power at 5.1 MHz, an initial enhancement by 25 percent of the backscattered power with Doppler shifts between -5.25 and -5.35 MHz appeared within less than 0.1 s after switching on the HF transmitter. The incoherent backscatter by Langmuir waves enhanced by photoelectrons was already above system noise by a factor greatly in excess of 10 before switching on the HF transmitter; the 25 percent enhancement thus corresponds to an enhancement greatly in excess of 250 percent above system noise. The enhancement drops to less than one tenth of its original value in less than a second.

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