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Re: SV: LF: SV: Re. T/A tests.

To: [email protected]
Subject: Re: SV: LF: SV: Re. T/A tests.
From: "Peter Cleall" <[email protected]>
Date: Wed, 16 May 2001 10:20:10 +0100
Reply-to: [email protected]
Sender: <[email protected]>
When I was working on the decay of satellite orbits about 10 years ago the
drag on the satellite, required an equation that accounted for  11 year,
time of year and recent solar effects both flux and geomagnetic.
In that particular case the flux turned out to be the best parameters for
the general changes over reasonable periods of time. Using something in the
form [3 monthly mean solar flux + 0.4*[difference between the 3 day mean
flux and the 3 monthly figure]].

Retrospective analysis showed the deviations from this ,mainly occurred due
to daily differences from the mean and also from random solar/geomagnetic
influences.  We may be able  to deduce something similar with one or more of
the Solar parameters to solve our long term understanding of our propagation
medium.

regards

peter cleall G8AFN
-----Original Message-----
From: john sexton <[email protected]>
To: [email protected] <[email protected]>
Date: 15 May 2001 19:15
Subject: Re: SV: LF: SV: Re. T/A tests.


Hi Chris,
Terman's graphs show that T/A sig levels are strongest during peaks of the
solar cycle. Whereas the correlation that Laurie described is T/A success
when sunspot numbers are low.
My guess is that both are probably true, i.e. on average T/A signal levels
are better during the active part of the cycle, but conversely weak signals
are more likely to be disrupted during the active part.
We will probably find that at the low point of the cycle chances of getting
across are worse but consistently worse, if you follow me.
73, John





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