Accession Number : AD0692700

Title :   THE EFFECTS OF IONS ON VLF PROPAGATION DURING POLAR CAP ABSORPTION EVENTS,

Corporate Author : RAND CORP SANTA MONICA CALIF

Personal Author(s) : Field,E. C.

Report Date : AUG 1969

Pagination or Media Count : 33

Abstract : Theoretical analysis of the propagation of electromagnetic waves in the very-low-frequency range (8-30 kHz) in the earth-ionosphere waveguide. Full wave methods incorporating the vertical inhomogeneity of the ionosphere are used. The model ionospheres, which correspond to both normal and disturbed PCA conditions, are chosen to illustrate the sensitivity of the propagation to various ionospheric properties. Spherical geometry is used for computing attenuation rates, phase velocities, and height dependences of the electromagnetic fields and of Joule heating. A major but justifiable simplification in the study is the omission of the geomagnetic field. Results of the calculations indicate that transpolar VLF waves suffer a great deal more attenuation during moderate PCA events than during the undisturbed daytime. (Author)

Descriptors :   (*ATMOSPHERICS, POLAR REGIONS), (*ELECTROMAGNETIC RADIATION, IONOSPHERIC PROPAGATION), VERY LOW FREQUENCY, ATTENUATION, IONS, ABSORPTION, ATMOSPHERE MODELS, IONOSPHERE

Subject Categories : Atmospheric Physics
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE