Correlation theory of the back scattering of radio waves

1971 ◽  
Vol 14 (9) ◽  
pp. 1045-1048 ◽  
Author(s):  
N. G. Denisov ◽  
V. V. Tamoikin
Keyword(s):  
Radio Waves ◽  
Correlation Theory ◽  
Back Scattering

Back-scattering of radio waves from the artificially perturbed F-region of the ionosphere

1976 ◽  
Vol 19 (7) ◽  
pp. 769-771 ◽  
Author(s):  
V. V. Belikovich ◽  
E. A. Benedictov ◽  
G. G. Getmantsev ◽  
Yu. A. Ignat'ev ◽  
G. P. Komrakov
Keyword(s):  
Radio Waves ◽  
F Region ◽  
Back Scattering

scholarly journals The Interpretation of Some Observations of Radio Waves Scattered from the Lower Ionosphere

1973 ◽  
Vol 26 (6) ◽  
pp. 815 ◽  
Author(s):  
RA Vincent
Keyword(s):  
Angular Distribution ◽  
Radio Wave ◽  
Wave Field ◽  
Spatial Scales ◽  
Lower Ionosphere ◽  
Axial Ratio ◽  
Radio Waves ◽  
Ground Pattern ◽  
Back Scattering ◽  
Distribution Of Power

Possible shapes and spatial scales of ionospheric irregularities in the lower ionosphere have been determined from analyses of two sets of radio wave back-scattering observations: measurements of the spatial scale of the ground pattern of the wave field back-scattered from altitudes near 95 km and measurements of the amount and angular distribution of power back-scattered from solitary horizontally-moving irregularities at altitudes near 75 km. At 95 km the irregularities are anisotropic, with larger horizontal than vertical dimensions. For an assumed Gaussian distribution of ionization, the inferred axial ratio (horizontal to vertical) is about three. It is tentatively concluded that the irregularities at 75 km are sharply bounded and are some kilometres in horizontal extent.

Radio Measurements of Coronal Magnetic Fields

1994 ◽  
Vol 144 ◽  
pp. 21-28 ◽  
Author(s):  
G. B. Gelfreikh
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Solar Corona ◽  
Active Regions ◽  
High Sensitivity ◽  
Coronal Magnetic Field ◽  
Transverse Magnetic ◽  
Radio Sources ◽  
Radio Waves ◽  
Solar Active Regions

AbstractA review of methods of measuring magnetic fields in the solar corona using spectral-polarization observations at microwaves with high spatial resolution is presented. The methods are based on the theory of thermal bremsstrahlung, thermal cyclotron emission, propagation of radio waves in quasi-transverse magnetic field and Faraday rotation of the plane of polarization. The most explicit program of measurements of magnetic fields in the atmosphere of solar active regions has been carried out using radio observations performed on the large reflector radio telescope of the Russian Academy of Sciences — RATAN-600. This proved possible due to good wavelength coverage, multichannel spectrographs observations and high sensitivity to polarization of the instrument. Besides direct measurements of the strength of the magnetic fields in some cases the peculiar parameters of radio sources, such as very steep spectra and high brightness temperatures provide some information on a very complicated local structure of the coronal magnetic field. Of special interest are the results found from combined RATAN-600 and large antennas of aperture synthesis (VLA and WSRT), the latter giving more detailed information on twodimensional structure of radio sources. The bulk of the data obtained allows us to investigate themagnetospheresof the solar active regions as the space in the solar corona where the structures and physical processes are controlled both by the photospheric/underphotospheric currents and surrounding “quiet” corona.

Radio Waves Kill Insect Pests

1933 ◽  
Vol 148 (5) ◽  
pp. 272-273 ◽  
Author(s):  
J. H. Davis
Keyword(s):  
Insect Pests ◽  
Radio Waves
Sign in / Sign up

Export Citation Format

Share Document