A study of acoustic-gravity waves responsible for focusing of HF radio waves reflected from the ionsphere

Details A study of acoustic-gravity waves responsible for focusing of HF radio waves reflected from the ionsphere A study of acoustic-gravity waves responsible for focusing of HF radio waves reflected from the ionsphere

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990angeo...8..287j&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 8, April 1990, p. 287-296. Research sponsored by DOE.

Computer Science

Sound

4

Gravity Waves, Ionospheric F-Scatter Propagation, Radio Waves, Sound Waves, Traveling Ionospheric Disturbances, Wave Reflection, Doppler Effect, High Frequencies, Ionospheric Electron Density

Scientific paper

Acoustic-gravity waves (AGWs) cause transient curvature in the ionospheric reflector, evidenced by amplitude modulation in HF radio skywave channels. When the reflector's radius of curvature approximates the reflector's height, the modulation takes the dramatic form of sharp spikes in power. Systematic observations of such spikes in the course of a synoptic study of the midlatitude, midday, winter/spring F region during 1989 are reported. The three-dimensional velocity of the associated AGWs is inferred from a combination of (1) coherent-array correlations (for the horizontal velocity) and (2) simply recording the delay for focusing from two separate heights (for vertical velocity). The dominant propagation azimuth is toward the SE; the phase velocity vector is typically tilted down (from horizontal) by 10-30 deg; the typical three-dimensional phase speed is in the range 100 m/s. The period in the observer's frame is inferred to be around 20 min; the horizontal wavenumber is inferred to be around 0.05/km. The intrinsic period (in the frame moving with the neutral wind) is inferred to be near the buoyancy period.

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