Comparative observations of D region HF partial reflections at 2 and 6 MHz

Details Comparative observations of D region HF partial reflections at 2 and 6 MHz Comparative observations of D region HF partial reflections at 2 and 6 MHz

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.7615h&link_type=abstract

Journal of Geophysical Research, vol. 87, Sept. 1, 1982, p. 7615-7624. Research supported by the Australian Research Grants Com

Other

10

D Region, Ionospheric Propagation, Radio Echoes, Short Wave Radio Transmission, Specular Reflection, High Frequencies, Ionospheric Electron Density, Radio Scattering, Scatter Propagation, Turbulence Effects, Wave Scattering, Wind Measurement

Scientific paper

Simultaneous comparisons of HF partial reflections from the ionospheric D region at 2 and 6 MHz have been made near Adelaide, Australia (35 deg S, 138 deg E). Echoes generally come from preferred heights, and these heights were the same on both frequencies. By accurately calibrating the receiving and transmitting systems used, it has been possible to compare effective voltage reflection coefficients at these two frequencies and hence provide further evidence that specular reflection processes are the primary means of scatter below about 75-80 km. At heights above 80 km, processes other than specular reflection appear to be important. Turbulent scatter may make a major contribution to the observed strengths, but this cannot yet be proved unambiguously. At 6 MHz, very little scatter was received from heights above 90 km, while strong echoes are usually observed at 2 MHz. This suggests that scales of 25 m are within the viscous range of turbulence at heights above 90 km.

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