[BC] Re: Fwd: FW: PRE AND POST HOURS

[Glen Kippel]

That's interesting.  When I lived in the Texas Panhandle, I was able to pick
up quite a few clear channel stations (yes, they really had them then, with
no capital letters) including KFI 640, WSM 650, WMAQ 670, WGN 720, WSB 750,
WHAS 840, WWL 870 and WCBS 880 -- between 1000 and noon local time.  I
suspect the D layer wasn't doing its job.

On 3/8/07, r j carpenter <rcarpen1 at verizon.net> wrote:
>
> <pedantic mode: ON>
>
> The F layer does not dissipate at sunrise. The absorptive D layer comes
> into existence when sunlight reaches it. This essentially eliminates
> long-distance propagation on the AM band (below the gyro frequency).
> The effect on AM propagation might be about the same, but the mechanism
> is different.  In low sunspot number years the gyro frequency gets down
> into the top of the AM band - thus "daytime skywave".
>
> <pedantic mode: OFF>
>
> bob c.
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