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Re: Topband: Band Open - But No Sunrise Peak

To: <>,"Petr Ourednik" <>, <>
Subject: Re: Topband: Band Open - But No Sunrise Peak
From: Nick Hall-Patch <>
Date: Sat, 13 Jan 2018 00:48:27 +0000
List-post: <>
Thanks for the clarification Dave. When did you last see consistent SR peaks at your location?

I suspect that shows the source of our difficulties. The highest level of geomagnetic activity in the present cycle started in late 2014. Up to that point, high latitude conditions in this location seemed pretty reasonable overall, considering the progress of the solar cycle, but since then, they've been fairly poor overall.

Perhaps quieter geomagnetic conditions overall contribute to the likelihood of the occurrence of sunrise peaks in signal strength? (though that's difficult to tell if there are also no signals heard previous to sunrise due to poor conditions)



At 21:30 2018-01-12, wrote:
When I refer to a SR peak in my earlier post, I'm referring to an increase in actual signal levels (with corresponding increase in S/N).
73. . . Dave, W0FLS

-----Original Message----- From: Nick Hall-Patch
Sent: Friday, January 12, 2018 11:23 AM
To: Petr Ourednik ;
Subject: Re: Topband: Band Open - But No Sunrise Peak

Wasn't some of the apparent peaking of signals at sunrise due to
improved signal to noise levels as noise levels drop at sunrise?

20 years ago for many of us, noise levels did actually drop at
sunrise.   For many DXers now, (man-made) noise levels stay the same
after sunrise, so, no apparent increase in signal strength (actually
increase in S/N ratio).

This is not to say that there was  no "real" increase in signal
levels at sunrise 20 years ago, just that it was perhaps less
frequent than was thought at the time.    If someone has recorded
signal strength levels from that period, I'd be happy to be proved wrong.

This morning, in western Canada, a medium-wave broadcaster,
HLAZ-1566kHz from South Korea was audible until after 1700UT,  an
hour past local sunrise, with a reasonable sunrise
peak.    Yesterday, there wasn't much of a sunrise peak, and  local
noise conditions haven't changed that much over 24 hours.

Was any west coaster on 160m on those two mornings?



Nick Hall-Patch
Victoria, BC

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