Hi, Antonio, I regularly note the geomagnetic Kp value when I take part in an FMT but most of the discussion of this takes place on K5CM's FMT-nuts mail list (as far as I know). Fortunately, most FMTs have not coincided with a major storm but there have been a few where some really weird effects were noted, probably due to "minor" disturbed geomagnetic conditions. 73, ... Martin VE3OAT Antonio I8IOV wrote : > > Hi all,thanks for your replies.Geomagnetic storms are known > to produce easily detectable effects at earth, sometimes dramatic > ( http://en.wikipedia.org/wiki/Solar_storm_of_1859 , > http://www.youtube.com/watch?v=7ukQhycKOFw ), sometimes serious > (compasses get crazy), sometimes minor (only aurorae boreales and > other minor effects). I think that time-nuts should be aware > whether these fenomena might affect their measurements or not. > Geomagnetic activity data are easily available at the NOAA website > http://www.swpc.noaa.gov/ , so checks would be easy. I hope to > see some reports here sooner or later.Antonio I8IOV >