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THE VARIATION IN RADIATION FROM THE SUN.  GEOMAGNETIC FIELD ACTIVITY AND
EVENTS IN THE LOWER ATMOSPHERE COUPLING UP TO THE IONOSPHERE ALSO PLAY AN
IMPORTANT ROLE IN DETERMINING WHAT THE IONIZATION IS.  IN FACT, VARIATION
IN SOLAR FLUX CAUSES THE LEAST AMOUNT OF THE VARIATION IN THE IONOSPHERE.
I ALSO LOOKED AT THE DATA FROM THE CHILTON IONOSONDE IN ENGLAND.  ITS AT
THE BELGIUM END OF YOUR PATH.  FIGURE 3 SHOWS THE DATA FOR SEPTEMBER 4 TO
17, 2013.  THE MUF WAS WELL ABOVE 21R3 MHZ THE RED LINE AFTER SUNRISE FOR
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MOST OF THE DAYS, INCLUDING YOUR OBSERVATION ON SEPTEMBER 15.  WE KIND OF
UNDERSTAND THE EFFECT OF GEOMAGNETIC FIELD ON THE IONOSPHERE, BUT
UNFORTUNATELY WE HAVE NO PARAMETER THAT MEASURES THE PROCESS INITIATED BY
EVENTS IN THE LOWER ATMOSPHERE.  ALL OF THIS SAYS WE DO NOT HAVE A DAILY
MODEL OF THE IONOSPHERE.  WHILE THE SOLAR DATA CAN PROVIDE A USEFUL
PREDICTION OF THE AVERAGE PROPAGATION CONDITIONS OVER A PERIOD, USING
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