Accession Number:

ADA010780

Title:

Mode Conversion and Single Mode Excitation in the Earth-Ionosphere Waveguide with Arbitrary Terrestrial Magnetic Field.

Descriptive Note:

Final technical rept. 1 Jan-31 Dec 74,

Corporate Author:

TECHNISCHE HOCHSCHULE GRAZ (AUSTRIA) INSTITUT FUER THEORETISCHE PHYSIK UND REAKTORPHYSIK

Personal Author(s):

• Ledinegg,Ernst

Report Date:

1975-01-01

Pagination or Media Count:

97.0

Abstract:

The present Final Report contains the continuation and extension of investigations on the propagation of electromagnetic VLF waves in polar regions. The extension considered in this report concerns mainly the terrestrial magnetic field. Part I is devoted to general theoretical considerations. It deals with the derivation of a fictitious surface impedance of the plane ionospheric boundary which mimics the influence of the ionosphere on wave propagation through the atmosphere. In Part II the surface impedance derived in Part I is applied to two waveguide models, the plane two-dimensional and the cylindrical model. In Part III the possibilities for suppressing or favouring the excitation of certain modes in the earth-ionosphere waveguide by a suitable antenna array are discussed.

Descriptors:

• *POLAR REGIONS
• *RADIO TRANSMISSION
• MATHEMATICAL MODELS
• GEOMAGNETISM
• IONOSPHERE
• ELECTROMAGNETIC WAVE PROPAGATION
• AUSTRIA
• VERY LOW FREQUENCY

Subject Categories:

• Radiofrequency Wave Propagation
• Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE