[South Florida DX Association] NW7US Propagation Update: 8-XI-2003

[Bill Marx]

>From Thomas NW7US
-Bill W2CQ

A weak shockwave from the glancing blow of the coronal mass ejection
> from the X28-class flare of 4-XI-2003 was recorded at about 
> 1900Z 6-XI-2003.  It only produced minor to major storm conditions
> that passed after a few hours.
> 
> As I write this update, the geomagnetic activity is slightly active
> due to the influence of a small coronoal hole.  The IMF 
> (Interplanetary Magnetic Field) has been somewhat orientated toward
> the south (with a Bz reading that is negative), so this has elevated
> the geomagnetic activity.  This geomagnetic activity will continue 
> for a few days.  It will mostly degrade over-the-pole and very high-
> latitude propagation paths, and slightly degrade the lower HF
> frequencies.
> 
> The proton event that we've been having is pretty much over, though,
> so the polar paths are better than they've been for many days, even
> with the elevated goemagnetic activity.
> 
> Here's an interesting note: on 6-XI-2003, two B-class flares were
> recorded.  These unusually long flares are indirect echoes caused
> by giant flares still occurring from those two huge sunspots, but
> from the other side of the sun!  This is an indication that we'll
> want to watch for the return of these sunspot groups and their
> possible continuation of high intensity flaring, when they rotate
> back into view in about 10 days.
> 
> Propagation this weekend should be fair to good for most paths, 
> on low HF all the way up to about 21 MHz.  Frequencies above 21 MHz
> will have weaker propagation on many paths, as the 10.7-cm flux has
> decreased again to below 100.  Predicted average flux is 90 and 86
> for today and tomorrow.
> 
> More at http://prop.hfradio.org
> 
> 
> 73 de Tomas, NW7US (AAR0JA/AAM0EWA)
> --
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