[CQ-Contest] Aurora and more...

nw7us at hfradio.org nw7us at hfradio.org
Fri Jan 21 14:47:53 EST 2005

NW7US Propagation Bulletin Update
21 January 2005 - 1945 UTC

As I mentioned early on (see my recent bulletins), the X7 flare unleashed  
a coronal mass ejection.  I had reported that it was probable that the CME  
was directed Earthward.  It was.  It has hit, today, and we are now seeing  
a planetary K index (Kp) of 8, with a reading from Boulder at 7.  At the  
time of this bulletin, the Bz is strongly positive, decreasing the full  
impact on geomagnetic activity.  However, we're watching the IMF closely,  
becuase if it does turn southward, what is already a major/severe  
geomagnetic storm will increase even more in strength.

Of course, the dynamic pressure of this passage is very high, and the  
speed is over 950 km/s.  At the same time, the proton storm is finally  

Aurora is very possible for North America this evening.  Certainly, Aurora  
is active over Asia/Europe.  With a Kp of 8, it is possible that radio  
propagation via Aurora is in the cards for today/tonight.

73 de Tomas, NW7US (AAR0JA/AAA0WA)

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