[NZ4O Spaceweather] DISCUSSION OF SOLAR SPACE & GEOMAGNETIC WX CONDX

[Thomas F Giella NZ4O]

DISCUSSION OF SOLAR, SPACE & GEOMAGNETIC WEATHER CONDITIONS THAT CAN IMPACT 
MF & HF RADIO WAVE PROPAGATION IN A NEGATIVE MANNER-
For the 17th day in a row the daily sunspot number has languished below 100, 
at 90. However there was some weak to moderate strength east-west radio wave 
propagation on 10 meters.

There are no significant impediments to good radio wave propagation on the 
HF bands, other than the daily sunspot number needs to be higher than the 
present 90, as the higher the sunspot number (100 & >, 150 > best) the more 
ultraviolet light available to increase ionization in the F/F2 layer, for 
more consistent east-west radio wave propagation openings on 12 and 10 
meters.

On the medium frequency (MF) bands there exists the normal absorption of RF 
signals in the D layer due to incoming cosmic rays and hard x-rays. Also the 
background x-ray flux is running in the C range so there is some additional 
absorption of RF signals in the D layer.

Day before yesterday a C1.7 solar flare associated with a large filament 
eruption and CME behind the east limb of the sun occurred. A continuation of 
a  small increase in energetic protons was also associated with the event 
and has created minor RF signal absorption via the D layer mostly at high 
latitudes.



73 & GUD DX, 
Thomas F. Giella, NZ4O
Lakeland, FL, USA
nz4o at tampabay.rr.com

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