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(meteorobs) Re: Unable to deliver your message



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>   ------------------------------------------------------------------------
>
> Subject: re: Sporadic E outburst?
> Date: Thu, 24 Oct 2002 13:37:25 -0000
> From: "drobnock2" <drobnock@penn.com>
> To: meteorobs@egroups.com
>
> ... normal range for this effect?
>
> Is anybody else currently experiencing interference from Sporadic E?
> Is it a global phenomenon, or just local?
>
> All I know for sure is that my data for the Orionids is useless until
> this episode ends.
>
>                  regards, Bruce McCurdy
>
> Sporadic E is a local event. With a caution on "how local?"
>
> In general Sporadic - E occurs at midlatitudes 15 to 45 degrees in the
> northern hemisphere during May to July, with a less frequent event by
> the end of December. It occures independent of the solar cycle. The
> occurance of Sporadic - E usually occures from 9am to noon local time
> and again from 5pm to 8pm. The event may occur a few minutes to
> several hours. The ARRL handbook (199) comments that the Sporadic-E
> event is an almost constant event in the polar regions at night.
>
> It is accepted that the event is an ionization in the E layer,
> between 100 to 110 km and maybe between 10 to 100 km in extent (ARRL
> Handbook 1999).
>
> Some speculation suggest the cause as heavy metal ions (meteors ?) or
> high altitude wind shear.
>
> The ARRL published  a two part article  with in the past two years on
> new research on the Sporadic - E. I'll try to locate the exact date.
> Or maybe someone may have that information available.
>
> George John Drobnock

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