Aurora range question:
Q: >>>>
How far away from the visual Aurora can VHF QSOs be made ? <<<< By
degrees or miles/km.
Distance away from AU (expressed in degrees of Latitude) to predict
RF-VHFaccess to AU.
The noaa.gov site states :
" ( Keep in mind that aurora can still be viewed when it's position
is 4 to 5 degrees of latitude away from the viewer,
although it will appear [at ] about 20 degrees
above the horizon.)"
According to the link on the N1BUG page, there was some aurora
down to about 59 degrees latitude last night.
But, no spots were found for NA VHF QSOs.
=====================================
More de N1RR:
We all now that the radio horizon is 4/3 of the visual horizon. So,
that roughly translates to 6.66 degrees
for a 20 degree take-off at RF. But this doesn't give the maximum range to
AU at RF-VHF.
It's probably the same one half the maximum skip distance for a
signal which is reflected off a 200-400km, the
highest of AU depending on intensity of disturbance. Another way may be to
determine the maximum skip distance
for an RF short skip when the atmospheric reflection/refraction occurs at
an altitude of 200-400km.
Charles Morrison
Amateur Radio callsign: N1RR
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