AG fuer technische Informatik Meystre
by André Meystre HB9BIG
Highest Probable Frequency HPF for working VK0IR on Heard Island
13. to 27. january 97 / sunspotnumber 10
HPF is expected at 10% of the month
Interpretation helps: The most areas of the maps belong to the low frequency range of the legend.
The changes in frequency are rather smooth, no steps, so higher frequencies
(light colors) are found inside of the gray clouds, if any.
The blue area inside the light gray cloud belongs to the 18Mhz up range.
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