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If the solar flare is geoeffective (Earth
directed) and has emitted excessive X-ray radiation then we would see increased
absorption (radio blackout) of day time MF/HF signals via the D layer.
If excessive protons >10o
were also emitted then we would also see polar cap absorption of signals both
day and night.
Then 1-3 days later an ionospheric storm
would commence which would impact higher frequencies (HF) first by reducing the
MUF of the F layer. You could also see some MF signal absorption on high
latitude propagation paths at E layer height, which coincides with visible and
radio aurora altitude wise.
Also if enough protons and electrons
precipitate via magnetic lines of force to the equatorial ring current,
then we would see similar MF signal absorption at low and mid latitudes
too.
The X13+ solar flare occurred over the east
limb and therefore was not Earth directed, so global impact on HF/MF radio
propagation conditions will be minimal.
The X13 solar flare is very large but no
where near one of the largest ever recorded.
73 & GUD DX,
Thomas F. Giella, KN4LF Retired Meteorologist & Space Plasma
Physicist
Lakeland, FL, USA Grid Square EL97AW 27 57 26.5 N 81 56 46.6 W kn4lf@xxxxxxxx Grundig S350 & 2 Foot Box
Loop
KN4LF Amateur & SWL Radio History: http://www.kn4lf.com/index.htm
KN4LF MF Radio Propagation Theory Notes: http://www.kn4lf.com/kn4lf8.htm Florida Daily Weather Discussion Blog: http://www.kn4lf.com/flwx1.htm
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