‰  NOW 7 1/2 WPM  ‰   TEXT IS FROM JANUARY 2014 QST PAGE 61  ‰

SUNSPOT NUMBER DOES NOT MAP TO A UNIQUE STATE OF THE IONOSPHERE.  FIGURE 1
IS A PLOT OF THE MAXIMUM USABLE FREQUENCY MUF OVER THE WALLOPS ISLAND,
VIRGINIA IONOSONDE FOR A 3000 KILOMETER PATH AT 1700 UTC FOR ALL THE DAYS
IN AUGUST 2009.  NOTE THAT THE MUF VARIES FROM A LOW OF ABOUT 11 MHZ TO A
‰  END OF 7 1/2 WPM TEXT  ‰  QST DE W1AW  ƒ