Evidence of an ionospheric reflecting layer below the classical D region

Details Evidence of an ionospheric reflecting layer below the classical D region Evidence of an ionospheric reflecting layer below the classical D region

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.3037r&link_type=abstract

Journal of Geophysical Research, vol. 85, June 1, 1980, p. 3037-3044. USAF-supported research.

Computer Science

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2

Atmospheric Ionization, Ionospheric Propagation, Ionospheric Sounding, Lower Ionosphere, Radio Echoes, Wave Reflection, Cosmic Rays, D Region, Daytime, Ionospheric Composition, Low Frequencies, Lyman Alpha Radiation, Photodetachment, Waveforms

Scientific paper

A series of direct and ionospherically reflected low-frequency pulses, recorded over a typical 24-hr period in December 1972, are presented for normal and rotated polarizations. Examination of the pulse wave form suggests the simultaneous presence of two discrete but barely resolved reflections from different heights in the daytime ionosphere. The upper reflection, whose height varied from 72 to 78 km as the solar zenith angle changed, is identified with the classical D region, caused primarily by Lyman alpha radiation. The lower reflection was at a nearly constant altitude of 63 km from shortly after sunrise to shortly before sunset. The ionization responsible for the low altitude reflection may be caused by cosmic rays and photodetachment, a mechanism proposed in connection with the hypothetical C layer of the lower daytime atmosphere. An ionization model was developed which closely reproduces the observed reflected wave forms using the full wave theory and spectral analysis.

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