Topband: Solar wind

Ilmo Anttila ilmo.anttila at qualisys.fi
Sat Nov 8 17:08:36 EST 2008


Topbanders

I do follow solar wind and dynamic pressure readings daily. To my opinion both of them indicate very well propagation on topband even better than A and K indexes.
Good rule of thumb is, if solar wind speed is less than 300km/s and dynamic pressure less than 0,5 nPa it is expected very good conditions to JA, NA and even direct over North Pole here in South Finland above 60 degrees North.

73

Ilmo, OH2BO


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