. QST . or this pulse to return to the receiver, onecan determine the distance to the auroral ioniza-tion. Accompanied by a sharply directionalantenna, the range and azimuth of auroralechoes can therefore be determined by a singlestation. Some radar experiments were done at Cornellon 103 Mc, using a high-powered war-surplussearch radar.® This used a large antenna 8dipoles vertically and 4 dipoles in width, thewhole affair being rotatable. Echoes were ob-tained about 400 to 600 miles to the was fairly good correspondence betweenthe echoes obtained and ray activity (verticalstreaks)
. QST . or this pulse to return to the receiver, onecan determine the distance to the auroral ioniza-tion. Accompanied by a sharply directionalantenna, the range and azimuth of auroralechoes can therefore be determined by a singlestation. Some radar experiments were done at Cornellon 103 Mc, using a high-powered war-surplussearch radar.® This used a large antenna 8dipoles vertically and 4 dipoles in width, thewhole affair being rotatable. Echoes were ob-tained about 400 to 600 miles to the was fairly good correspondence betweenthe echoes obtained and ray activity (verticalstreaks) seen by eye. There never had beenenough auroral activity to determine whetherone could obtain echoes when aurora was over-head. 9 Thaver, Masters thesis. Cornell University. 1952. Fig. 5 — September andMarch are good months forauroral propagation. Thedecrease from year to yearshown here should reverseafter the 1954 sunspotminimum. SEASONAL VARIATION OT AURORAL SI&NALS APRIL 1952 -JULY 1954 MC. January 1955 13 \ 100 500 800 RANGE IN KILOMETERS During the summer of 1953, Ken Bowles(W2MTU, ex-ZGP) and the author had anopportunity to work at the Geophysical Instituteat the University of Alaska. The Institute islocated at College, Alaska, a few miles fromFairbanks. It is, therefore, only 100 miles tothe south of the maximum auroral-activityzone which forms a ring around the earthsmagnetic pole. Some observations will now bedescribed that were performed by the authorduring 1953, and which are illustrative of recentresearch now under way at several is seen frequently, is strong and occursfrequently over the entire sky including south ofoverhead. Hence, this northern latitude affordsan excellent place to observe the effects of visibleaurora on propagation. Arrangements were made to operate a transmitter on Mc. about 100 milesto the east. The signal could usually l)e heard Fig. 6 — Typical 50-Mc. auroral echo. The trailingedge of the 51.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915
