Simultaneous observation of HF-enhanced plasma waves and HF-wave self-focusing
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 Incohernt-Scatter-Radars. Intense HF-radiowaves propagating in the ionosphere also produce electron density irregularities with scale sizes much larger than the HF wavelength of approx.60 m. These have been observed by radio star intensity scintillations. For the past 2 years a new method was used at Arecibo, P.R. 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.
- Research Organization:
- Max-Planck-Institut fuer Aeronomie, D-3411 Katlenburg-Lindau, F.R. Germany
- OSTI ID:
- 6175597
- Journal Information:
- Geophys. Res. Lett.; (United States), Journal Name: Geophys. Res. Lett.; (United States) Vol. 11:7; ISSN GPRLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Ionospheric
& Magetospheric Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
EARTH ATMOSPHERE
ELECTROMAGNETIC RADIATION
ELECTRON DENSITY
INCOHERENT SCATTERING
IONOSPHERE
MEASURING INSTRUMENTS
PLANETARY IONOSPHERES
PLASMA DIAGNOSTICS
PLASMA WAVES
RADAR
RADIATIONS
RADIOWAVE RADIATION
RANGE FINDERS
SCATTERING
SCINTILLATIONS
WAVE PROPAGATION