ELF terrestrial radio wave field calculations with the zonal harmonic series

2005 ◽  
Author(s):  
J. Johler ◽  
R. Lewis
Keyword(s):  
Radio Wave ◽  
Wave Field ◽  
Harmonic Series ◽  
Zonal Harmonic

Calculation of the electron density of the F region heated by a high-power radio-wave field

1977 ◽  
Vol 20 (12) ◽  
pp. 1267-1270 ◽  
Author(s):  
Yu. A. Ignat'ev ◽  
Z. N. Krotova ◽  
�. E. Mityakova
Keyword(s):  
Radio Wave ◽  
Wave Field ◽  
Electron Density ◽  
High Power ◽  
F Region

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.

The use of a large-aperture radio system for meteor studies

1980 ◽  
Vol 58 (6) ◽  
pp. 779-787 ◽  
Author(s):  
R. W. Herring ◽  
P. A. Forsyth
Keyword(s):  
Radio Wave ◽  
Wave Field ◽  
Scattered Radiation ◽  
Radio Waves ◽  
Aperture Antenna ◽  
Frequency Range ◽  
Radio System ◽  
Decay Times ◽  
Simultaneous Existence ◽  
Meteor Trails

A large sampled-aperture antenna array has been used to investigate the structure of the radio wave field scattered by meteor trails. The experiment measured the phase and amplitude of the radio waves in the frequency range 20 to 30 MHz at 58 points distributed over an aperture of almost 1.2 km. The temporal changes in the structure of the scattered radiation clearly show the influence of distortion of the meteor trails by atmospheric winds, but are incompatible with the widely accepted model which attributes fading and anomalous decay times to the distortion of a single trail. The observations seem to imply the simultaneous existence of two or more trails but whether these trails are due to fragmentation of the meteoroid in the atmosphere or to simultaneous entry of independent meteoroids is not clear.

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