Travelling ionospheric disturbances and the effectiveness of powerful HF transmitters in ionospheric modification and radio location of the moon

Details Travelling ionospheric disturbances and the effectiveness of powerful HF transmitters in ionospheric modification and radio location of the moon Travelling ionospheric disturbances and the effectiveness of powerful HF transmitters in ionospheric modification and radio location of the moon

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jatp...55...57a&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 55, no. 1, p. 57-64.

Physics

4

Radio Direction Finders, Radio Transmitters, Traveling Ionospheric Disturbances, Wave Reflection, Antenna Arrays, Atmospheric Heating, Focusing, High Frequencies, Phased Arrays, Radio Signals

Scientific paper

The effects of medium-scale traveling ionospheric disturbances (MS TIDs), which arise when powerful HF transmitters are operated in conjunction with antenna arrays designed for ionospheric modification (heating) and for radio location of the moon, are investigated qualitatively in the linear approximation using the ray tracing method. It is found, in particular, that the focusing effect of HF radio waves, due to a displacement of MS TIDs, gives rise to a strong inhomogeneous nonstationary modulation of the space-time field intensity distribution of a powerful transmitter, both at heights near the reflection region (in heating experiments) and at the exit from the ionosphere (in lunar radio location). The excess intensity over an unperturbed value for typical parameters of MS TIDs in ionospheric modification experiments may reach values of hundreds of percent.

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