AN HF SWEEP FREQUENCY STUDY OF THE ARCTIC IONOSPHERE

OBSERVATIONS MADE DURING 1958 AND 1959 USING A SWEEP FREQUENCY, HF, oblique sounder located at College, Alaska, are discussed, and selected groups of echoes are illustrated. Groundscatter is the predominant echo type observed on midlatitude backscatter records, but this is not true in the high latit...

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Bibliographic Details
Main Author: BATES,HOWARD F.
Other Authors: ALASKA UNIV COLLEGE GEOPHYSICAL INST
Format: Text
Language:English
Published: 1961
Subjects:
*IONOSPHERE
*RADIO WAVES
AURORAE
DENSITY
DIURNAL VARIATIONS
ECHO RANGING
ELECTRONS
HIGH FREQUENCY
IONOSPHERIC PROPAGATION
MAGNETIC PROPERTIES
COMMUNICATION AND RADIO SYSTEMS
REFLECTION
SCATTERING
Arctic
Alaska
Online Access:http://www.dtic.mil/docs/citations/AD0257534
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0257534
Description
Summary:OBSERVATIONS MADE DURING 1958 AND 1959 USING A SWEEP FREQUENCY, HF, oblique sounder located at College, Alaska, are discussed, and selected groups of echoes are illustrated. Groundscatter is the predominant echo type observed on midlatitude backscatter records, but this is not true in the high latitudes. The majority of the scatter echoes from soundings toward geomagnetic north were direct F region scatter of two main types - 1F and constant range echoes. These same echo types were observed from the E region during magnetic disturbances (the slant Es echo corresponds to the 1F echo). These echoes were centered about geomagnetic north on swept azimuth soundings and were produced by scatter near the oblique reflection point in the ionosphere. Thus, the echoes were caused by scatter from irregularities aligned along the geomagnetic field. (Author)

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