Construction of theoretical F-spread ionogams from scattering in the HF band from field-aligned irregularities

Thesis/Dissertation · Tue Jan 01 00:00:00 EST 1985

OSTI ID:5115220

Powers, W J

The scattering and propagation of electromagnetic fields in the ionosphere for the HF band is considered. Particular attention is given to scattering at the geomagnetic equator from irregularities of ionization density that are aligned along the earth's magnetic field and that have lengths that are much greater than a Fresnel scale. Perpendicular to the earth's magnetic field the irregularities are assumed to be isotropic with scale lengths (wavelengths /(2..pi..)) extending from an inner scale equal to the ionic gyroradius to an outer scale on the order of the scale height of the ionosphere. Primary emphasis is placed on the weak scattering of pulses from field-aligned irregularities embedded in the night time F-layer, with application to explaining F-spread ionograms. The average ionization density of the night time F-layer is assumed to be well modeled by a parabolic layer. Assuming that the effects of the earth's magnetic field and collisions can be neglected, an approximate dyadic Green's function is derived and utilized in the determination of the incident and singly scattered fields.

• Research Organization: California Univ., San Diego (USA)
• OSTI ID: 5115220
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
F REGION
WAVE PROPAGATION
SHORT WAVE RADIATION
SCATTERING
GEOMAGNETIC EQUATOR
GEOMAGNETIC FIELD
EARTH ATMOSPHERE
ELECTROMAGNETIC RADIATION
IONOSPHERE
MAGNETIC FIELDS
PLANETARY IONOSPHERES
RADIATIONS
RADIOWAVE RADIATION
640201* - Atmospheric Physics- Auroral
Ionospheric
& Magetospheric Phenomena