QST DE W1AW
HR PROPAGATION FORECAST BULLETIN NR 24  ARLP024
FROM ARRL HEADQUARTERS
NEWINGTON CT JUN 12, 1989
TO ALL RADIO AMATEURS

IN THE FIRST TEN DAYS OF JUNE THE SOLAR FLUX GREW FROM 189 TO 266,
THE LATTER BEING THE HIGHEST SINCE A MARCH 15 PEAK OF 270. THE CYCLE
22 HIGH SO FAR IS 299, RECORDED JANUARY 17. A RISING SOLAR FLUX CURVE
IS NOT NECESSARILY GOOD FOR HF PROPAGATION. INSTEAD, THE DOWN SIDE
AFTER THE PEAK IS LIKELY TO BRING MORE STABLE CONDITIONS.

THE SPECTACULAR APPEARANCE OF THE SUN ON JUNE 11, AS SEEN THROUGH A
TELESCOPE EQUIPPED WITH SUITABLE FILTERS FOR VIEWING, INDICATES THAT
PROPAGATION MAY BE BETTER THIS WEEK THAN SINCE BEFORE THE MARCH FLUX
PEAK. WHAT MAY BE THE MOST SPECTACULAR SUNSPOT GROUP OF CYCLE 22 TO
DATE IS POSITIONED FOR MAXIMUM EFFECT THIS WEEK. OTHER SIZABLE GROUPS
NOW VISIBLE WILL BE AFFECTING PROPAGATION LESS BEFORE THE WEEK IS
OVER, BUT NOT ENOUGH TO AFFECT THE DX BANDS SERIOUSLY.

PROPAGATION, ESPECIALLY IN THE HIGH LATITUDES OF THE NORTHERN
HEMISPHERE, HAS BEEN GENERALLY POOR OF LATE. THIS WILL CONTINUE
THROUGH THE SUMMER, ESPECIALLY ON 21 MHZ AND HIGHER FREQUENCIES. WE
ARE NEARING THE PEAK TIME FOR SPORADIC E SKIP. THIS MODE MAKES FOR
STRONG BUT OFTEN ERRATIC SIGNALS OVER RELATIVELY SHORT DISTANCES, THE
E LAYER BEING NEARER THE EARTH THAN THE F2 LAYER, THE PRIME DX MEDIUM
IN THE FALL. THE INFLUENCE OF SPORADIC E IS HIGHEST ON 28 AND 50 MHZ,
BUT IT CAN CAUSE WILD TIMES ON 144 MHZ AS WELL.

E SKIP IS MOST COMMON DURING MID MORNING AND EARLY EVENING HOURS, BUT
IT CAN APPEAR QUITE SUDDENLY AT ALMOST ANY TIME.

AMERICAN SUNSPOT NUMBERS FOR JUNE 1 THROUGH 7 WERE BETWEEN 117 AND
183 WITH A MEAN OF 154R7  AR

QST DE W1AW
HR PROPAGATION FORECAST BULLETIN NR 24  ARLP024
FROM ARRL HEADQUARTERS
NEWINGTON CT JUN 12, 1989
TO ALL RADIO AMATEURS

IN THE FIRST TEN DAYS OF JUNE THE SOLAR FLUX GREW FROM 189 TO 266,
THE LATTER BEING THE HIGHEST SINCE A MARCH 15 PEAK OF 270. THE CYCLE
22 HIGH SO FAR IS 299, RECORDED JANUARY 17. A RISING SOLAR FLUX CURVE
IS NOT NECESSARILY GOOD FOR HF PROPAGATION. INSTEAD, THE DOWN SIDE
AFTER THE PEAK IS LIKELY TO BRING MORE STABLE CONDITIONS.

THE SPECTACULAR APPEARANCE OF THE SUN ON JUNE 11, AS SEEN THROUGH A
TELESCOPE EQUIPPED WITH SUITABLE FILTERS FOR VIEWING, INDICATES THAT
PROPAGATION MAY BE BETTER THIS WEEK THAN SINCE BEFORE THE MARCH FLUX
PEAK. WHAT MAY BE THE MOST SPECTACULAR SUNSPOT GROUP OF CYCLE 22 TO
DATE IS POSITIONED FOR MAXIMUM EFFECT THIS WEEK. OTHER SIZABLE GROUPS
NOW VISIBLE WILL BE AFFECTING PROPAGATION LESS BEFORE THE WEEK IS
OVER, BUT NOT ENOUGH TO AFFECT THE DX BANDS SERIOUSLY.

PROPAGATION, ESPECIALLY IN THE HIGH LATITUDES OF THE NORTHERN
HEMISPHERE, HAS BEEN GENERALLY POOR OF LATE. THIS WILL CONTINUE
THROUGH THE SUMMER, ESPECIALLY ON 21 MHZ AND HIGHER FREQUENCIES. WE
ARE NEARING THE PEAK TIME FOR SPORADIC E SKIP. THIS MODE MAKES FOR
STRONG BUT OFTEN ERRATIC SIGNALS OVER RELATIVELY SHORT DISTANCES, THE
E LAYER BEING NEARER THE EARTH THAN THE F2 LAYER, THE PRIME DX MEDIUM
IN THE FALL. THE INFLUENCE OF SPORADIC E IS HIGHEST ON 28 AND 50 MHZ,
BUT IT CAN CAUSE WILD TIMES ON 144 MHZ AS WELL.

E SKIP IS MOST COMMON DURING MID MORNING AND EARLY EVENING HOURS, BUT
IT CAN APPEAR QUITE SUDDENLY AT ALMOST ANY TIME.

AMERICAN SUNSPOT NUMBERS FOR JUNE 1 THROUGH 7 WERE BETWEEN 117 AND
183 WITH A MEAN OF 154R7  AR