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Prepared jointly by the U.S. Air Force
and the U.S. Dept. of Commerce, NOAA, Space Environment Center
SUBJ: HF RADIO PROPAGATION REPORT
JOINT USAF/NOAA BULLETIN PREPARED BY 55SWXS, FALCON AFB, CO.
PRIMARY HF RADIO PROPAGATION REPORT ISSUED AT 28/0528Z APR 97.
PART I. SUMMARY 28/0000Z TO 28/0600Z APR 97/
FORECAST 28/0600Z TO 28/1200Z APR 97.
QUADRANT
I II III IV
0 TO 90W 90W TO 180 180 TO 90E 90E TO 0
REGION POLAR N5 N5 N5 N5
AURORAL N4 N4 N5 N5
MIDDLE N6 N6 N6 N6
LOW N6 N6 N6 N6
EQUATORIAL N7 N7 N7 N7
PART II. GENERAL DESCRIPTION OF HF RADIO PROPAGATION CONDITIONS
OBSERVED DURING THE 24 HOUR PERIOD ENDING 27/2400Z, AND FORECAST
CONDITIONS FOR THE NEXT 24 HOURS.
A. OBSERVED CONDITIONS: PROPAGATION CONDITIONS WERE NORMAL.
B. FORECAST CONDITIONS: EXPECT PROPAGATION CONDITIONS TO REMAIN
NORMAL THROUGHOUT THE FORECAST PERIOD.
PART III. SUMMARY OF SOLAR FLARE INDUCED IONOSPHERIC DISTURBANCES
WHICH MAY HAVE CAUSED SHORT WAVE FADES IN THE SUNLIT HEMISPHERE
DURING THE 24 HOUR PERIOD ENDING 27/2400Z APR 97...NONE
PROBABILITY FOR THE NEXT 24 HOURS: NIL
PART IV. OBSERVED/FORECAST 10.7 CM FLUX AND K/AP.
THE OBSERVED 10.7 CM FLUX FOR 27 APR 97 WAS 073.
THE FORECAST 10.7 CM FLUX FOR 28, 29, AND 30 APR 97
ARE 074, 074, AND 074.
THE OBSERVED K/AP VALUE FOR 27 APR 97 WAS 01/04.
THE FORECAST K/AP VALUES FOR 28, 29, AND 30 APR 97
ARE 02/08, 02/08, AND 02/08.
SATELLITE X-RAY BACKGROUND: A1.8 (1.8 E MINUS 05 ERGS/CM SQ/SEC).
THE EFFECTIVE SUNSPOT NUMBER FOR 27 APR 97 WAS 10.0.
PART V. REMARKS
ISSUED BY THE 55TH SPACE WEATHER SQUADRON, FALCON AFB, CO.
55SWXS HAS A QUICK TURN-AROUND CAPABILITY TO SUPPORT REQUESTS FROM
HIGH FREQUENCY (HF) COMMUNICATORS FOR SPECIFICATIONS AND/OR
FORECASTS OF MAXIMUM USABLE FREQUENCY AND FREQUENCY OF OPTIMUM
TRANSMISSION. IN ADDITION, WE CAN EVALUATE ANOMALOUS ENVIRONMENTAL
CONDITIONS THAT CAN AFFECT DOD ASSETS OPERATING IN AND THROUGH
THE SPACE ENVIRONMENT. FOR SUPPORT, CONTACT THE CREW COMMANDER AT
DSN 560-6313 OR COMMERCIAL (719) 567-6313. QUESTIONS CONCERNING
THE FORMAT OR CONTENT OF THE HFUS1/2 BULLETINS MAY BE DIRECTED
TO THE SPACE ENVIRONMENTAL FORECASTER AT DSN 560-6312 OR
COMMERCIAL (719) 567-6312.
99999
.
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