TRANSAURORAL HIGH FREQUENCY RADIO PROPAGATION. VOLUME I. SIGNAL AMPLITUDE OBSERVATIONS.

• Main Author: Roberts,Frank R.
• Other Authors: RAYTHEON CO NORWOOD MASS
• Format: Text
• Language: English
• Published: 1965
• Subjects: ATMOSPHERICS; AURORAE; ARCTIC REGIONS; RADIOFREQUENCY PULSES; GREENLAND; MASSACHUSETTS; RADIO WAVES; ELECTROMAGNETIC RADIATION; GEOPHYSICS; Arctic; Canada; Greenland; Thule
• Online Access: http://www.dtic.mil/docs/citations/AD0620683; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0620683

Pulsed signals of 11 and 17 mc were transmitted over the transauroral path from Thule, Greenland to Norwood, Massachusetts. This path, which is perpendicular to the auororal zone, has its midpoint near Fort Chimo, Canada in the region of maximum auroral activity. At the Norwood receiving terminal, continuous recording of signal amplitude was performed over a 17-month period. Graphical presentations of circuit performance illustrate diurnal and seasonal variations, together with the dependence on geomagetic activity. Normal propagation is F-layer controlled, although it departs markedly from classical predictions. Results of a theoretical investigation indicate that ionspheric layer tilts play no significant role in these departures. The occasional occurrence of anomalous modes is evident in the data. Absorption events coincident with reported shortwave fadeouts are noted. (Author)