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CONSEQUENTLY, 6 METER F LAYER PROPAGATION IS CONFINED ALMOST ENTIRELY TO
THE PEAK YEARS OF THE SOLAR ACTIVITY CYCLE.  PREDICTING RADIO PROPAGATION,
SATELLITE HEALTH AND POWER GRID ISSUES HAVE ALL LED TO INTEREST IN
PREDICTING FUTURE SOLAR ACTIVITY, ON BOTH SHORT AND LONG TIME SCALES.
THERE ARE ACTUALLY TWO INTIMATELY RELATED SOLAR CYCLES INVOLVED THE
ACTIVITY OR SUNSPOT CYCLE, AND THE SOLAR MAGNETIC CYCLE.  SOLAR ACTIVITY
CYCLE THE SUNSPOT CYCLE PEAKS ABOUT EVERY 11 YEARS.  SUNSPOTS ARE ALWAYS
FOUND IN PAIRS OR GROUPS.  THEY OCCUR IN TWO LATITUDE BANDS, ONE NORTH AND
THE OTHER SOUTH OF THE SOLAR EQUATOR FIGURE 1.  THEY COME AND GO WITHIN
THOSE LATITUDE BANDS WITH END TO END LIFETIMES OF A FEW DAYS TO SEVERAL
WEEKS.  AS THE SUN ROTATES ON ITS AXIS EVERY 27 DAYS OR SO, SUNSPOT PAIRS
AND GROUPS APPEAR TO MARCH ACROSS THE SUN FROM EAST TO WEST, BEING VISIBLE
FOR UP TO 14 DAYS AS THEY TRAVEL FROM LIMB TO LIMB AND THEN ROTATE OUT OF
SIGHT AROUND THE BACKSIDE.  IF THEY LIVE LONG ENOUGH, THEY RETURN TO THE
‰  FROM PAGE 92  ‰
N9DIX 315 2 1 730 TN N7EIE 72 2 5 668 WWA N4DXI 110 2 1 644 NFL AB5JR 193 2
1 636 NM W3GWM 242 2 1 634 EPA NN4RH 51 5 1 610 VA ND4X 152 2 1 604 TN
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