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cme 9-12-14

Sep 10th 2014, 17:50

WA1HEW

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
AS OF 1745utc IT APPEARS THE BANDS ARE WIPED OUT BY A cme NOT EXPECTED TO REACH US TIL 9/12.dON'T KNOW HOW LONG IT WILL LAST!
Sep 10th 2014, 18:19

AA6E

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
We have recently had an X-class solar flare (1823 9/10/14). Check http://www.n3kl.org/sun/noaa.html, for example. That's a very big flare. The UV radiation and X-rays will make very high D-layer absorption that kills the HF bands pretty well -- on the sunlit side of Earth. You can see that in real time at http://www.swpc.noaa.gov/drap/index.html . I would expect it to die away after a number of hours.

The X and UV effects of a flare are pretty much instantaneous. There may also be a Coronal Mass Ejection (CME) that travels more slowly. CME's are directed and very often miss the Earth entirely. If this one hits us, it may produce a serious geomagnetic event. That will upset HF propagation (again), and it may cause problems for power transmission lines.

73 Martin AA6E
Sep 10th 2014, 23:41

WA1HEW

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
Your insight is appreciated. It is now 2340UTC all seems to be back to the "new" normal, post Sunspot peak!!!!!!! Thanks...73

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