[IRCA] interesting webinar about propagation

[Nick Hall-Patch <nhp@xxxxxxxx>]

http://www.pvrc.org/webinar/2010-01-20%2022.01%20160%20Meter%20Propagation.wmv  has a recorded "webinar" concerning propagation on 160 metres by Carl Leutzelschwab, K9LA.  It's about an hour and a half long, and is quite intriguing.

One point that came up is that the north magnetic pole is moving northwards, and the movement has accelerated in the last decades:

http://news.nationalgeographic.com/news/2009/12/091224-north-pole-magnetic-russia-earth-core.html

has a bit more on this topic.   The upshot is that we may receive TA's in North America more regularly in future years, because the auroral zone tracks the magnetic pole, and the southern edge of the zone is moving north with the pole.

The other point addresses a possible explanation for the surge in long distance receptions just as the K-index increases at the onset of a geomagnetic storm, as apparently the duct between the E and F layers becomes better defined at this time, and the duct allows transfer of long range signals with little loss compared with ground bounces.

http://mysite.verizon.net/k9la/   has a number of articles about propagation, and 160m propagation in particular, and should soon contain the Powerpoint presentation on which the webinar was based.

best wishes,

Nick


*****************************
Nick Hall-Patch
Victoria, BC
Canada 

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