Physics
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984georl..11..677f&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 11, July 1984, p. 677-680.
Physics
7
High Frequencies, Ionospheric Propagation, Plasma Waves, Plasma-Electromagnetic Interaction, Self Focusing, Incoherent Scatter Radar, Ionospheric Electron Density, Power Spectra, Scintillation
Scientific paper
Intense HF-radiowaves of the ordinary mode transmitted from the ground enhance plasma waves near the reflection height. These have been extensively studied in the past by the use of incoherent-scatter radars. Intense HF-radiowaves propagating in the ionosphere also produce electron density irregularities with scale sizes much larger than the HF wavelength of about 60 m. These have been observed by radio star intensity scintillations. For the past 2 years a new method was used at Arecibo, PR which allows radar and scintillation measurements at 430 MHz to be performed simultaneously along the same line of sight. The scale sizes deduced from the scintillation measurements are shorter than the scale sizes observed with the radar and are inconsistent with the HF-power density thresholds predicted by existing theories.
Duncan L. M.
Frey Andrew
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