Coordinated study of subkilometer and 3-m irregularities in the F region generated by high-power HF heating at Arecibo

Details Coordinated study of subkilometer and 3-m irregularities in the F region generated by high-power HF heating at Arecibo Coordinated study of subkilometer and 3-m irregularities in the F region generated by high-power HF heating at Arecibo

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.9217b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Nov. 1, 1983, p. 9217-9225.

Physics

14

F Region, High Frequencies, Ionospheric Heating, Radio Frequency Heating, Backscattering, Radar Scattering, Scintillation, Solar Power Satellites

Scientific paper

High-power HF transmitters near Arecibo were used to generate artificial ionospheric irregularities in the F region. Radio-star scintillation observations at 430 MHz were performed at Arecibo with the 305-m antenna, and radar-backscatter measurements at 50 MHz were simultaneously made from Guadeloupe Island to probe the subkilometer and 3-m irregularities in the heated volume. Scintillation studies indicate a low-frequency modulation of the faster intensity-fluctuation structure, which translates to spatial dimensions of 1-2 km. The frequency of the modulation envelope is found to be controlled by the heater power and is related to the dominant irregularity wavelength generated by the self-focusing instability. Scintillation spectra imply a steep power-law index of -5 in the scale-length range of about 300-150 m and a shallow index of -2 at less than 150 m. Simultaneous measurements of 430-MHz scintillations and 50-MHz radar backscatter from field-aligned striations show that subkilometer irregularities can be generated by both O and X-mode heating, whereas the 3-m irregularities are excited only by the O-mode heating, as is predicted by the theories of self-focusing and parametric instability. The width of the 50-MHz echo Doppler spectra is observed to be only about 2-3 Hz, and independent of the background plasma drift, implying that the frequency bandwidth of the scattered signal is probably controlled by the instability process.

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