Physics
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jatp...46..155f&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 46, Feb. 1984, p. 155-164.
Physics
Electromagnetic Absorption, High Frequencies, Ionospheric Propagation, Radio Attenuation, Amplitudes, D Region, E Region, Height, Ionospheric Disturbances, Ionospheric Electron Density, Solar Flares
Scientific paper
It the A1 data collected at Camden, Australia, is sorted into 2 km virtual height bins, then the echo amplitudes are observed to increase as the overall virtual height decreases. Model calculations show that this behavior can be simulated by introducing a sharp increase in electron-density gradient near the reflection level. This appears to truncate the extent of the ray path in the deviative region and leads to a fall in absorption. Since the deviative component of the absorption is a large fraction of the total absorption (at the observing frequency of 1.91 MHz), this reduction can be dramatic. This mechanism is believed to be the main source of variability in single-frequency A1 absorption measurements.
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