[CQ-Contest] conditions for 10m]
n2ic at arrl.net
Wed Dec 14 13:51:01 EST 2005
jukka.klemola at nokia.com wrote:
> Good guess !
> Has this been verified somehow?
> Jukka OH6LI
This has only been verified empirically from 24 years of observing this
opening from Colorado, and now New Mexico.
Here's some recent empirical evidence:
- On Sunday afternoon, in the 10 meter contest, we had an excellent
1-hop F-layer opening between here and the entire USA east coast. There
isn't much ham population in northern VE2, but I did work many southern
VE2 stations. The planetary Kp index during that time was 5 - certainly
high enough for auroral Es.
- This opening did not occur during either CQWW Phone or CQWW CW, on
either 10 or 15 meters. The planetary Kp index was low during both of
these contests (Kp <= 2), suppressing auroral activity.
My summary of the conditions required for this opening are:
- A high enough electron density to support F-layer propagation from the
USA to the arctic region.
- A slightly or moderately disturbed geomagnetic field producing auroral
Es in the arctic region.
>>From: cq-contest-bounces at contesting.com
>>[mailto:cq-contest-bounces at contesting.com] On Behalf Of ext
>>F-layer from the USA to northern VE2, then auroral-induced
>>sporadic-E from VE2 to Scandanavia. Pretty common with
>>slightly disturbed conditions, as long as the F-layer supports
>>propagation to northern VE2.
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