Possible Radio Aurora (and Visual, too)

[NW7US]

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.

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 ending.

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.

[pcg]

Excellent report. Thanks for the warning...

[ku4a]

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