Angular characteristics of radio pulses reflected from the subpolar ionosphere

Details Angular characteristics of radio pulses reflected from the subpolar ionosphere Angular characteristics of radio pulses reflected from the subpolar ionosphere

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jatp...53..889a&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 53, Oct. 1991, p. 889-901.

Computer Science

Sound

Electromagnetic Pulses, F 2 Region, Ionospheric Propagation, Ionospheric Sounding, Radio Echoes, Signal Reflection, Doppler Effect, High Frequencies, Radio Direction Finders, Radio Spectra, Spectral Reflectance

Scientific paper

This paper presents results derived by measuring angular spectra of HF-radio pulses reflected from the subpolar ionospheric F2-region (62 deg N) using vertical-incidence soundings and a phase direction finder with Doppler filtering. The results correspond to three main types. One is the classical mirror reflection from the undisturbed ionospheric F2-region, typical of midlatitudes (deviations from zenith do not exceed 3 deg; the angular spectrum width is less than 1 deg). The second type includes oblique diffuse reflections with a deviation from zenith of from 10 to 45 deg. The azimuth of arrival of these reflections is distributed in the range from 0 to 360 deg, the angular spectrum width is from 5 to 10 deg, and the range varies from 400 to 600 km. The third type includes anomalous mirror reflections with small deviations from zenith (not greater than 3 deg) but with substantially larger detection ranges (for example, 500 km) as compared with the main reflections (250-300 km).

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