[amsat-bb] Amsat Journal - South Atlantic Anomoly
pconver at gmail.com
Wed Feb 28 22:12:12 UTC 2018
Interesting comments on South Atlantic Anomaly (SAA)
During PACSATs era, circa 1991, the LUSAT & PACSAT had their memory with
detection of SEU (Single Event Upsets).
They generate ELogs (Error Logs), with time in wich a glitch (radiation)
hit memory data.
The onboard software recorded time of the SEU, therefore knowing time,
satellite position over earth could be obtained.
We did for LUSAT a basic program at that time, that analyze ELogs and
plotted on a map where was the hit produced.
Surprisingly SAA appeared on the map, with more hits right showing at the
place where South Atlantic Anomaly was.
Program also shows operation of the fantastic PG/PB protocol that allowed
upload/download/share messages and large files worldwide.
This program is still operational, can be downloaded and run from
73, LU7ABF, Pedro
On Wed, Feb 28, 2018 at 6:36 PM, Jerry Buxton <n0jy at amsat.org> wrote:
> Hi Roy,
> I follow Curious Droid too and this piece on the SAA, as are his others
> in general, are interesting and good information.
> From the Fox-1 perspective, it was known early in the design that the
> SAA would/could have a big effect on operation and lifetime so designs
> take into account the best choices of COTS parts able to "weather the
> storm" as well as the operation of the IHU and radio in general. The
> resets are expected and we believe they may in some instances not even
> be noticed by satellite users (other than the reset number increment)
> because the radio is designed to operate without the IHU, albeit without
> telemetry as well, in the expectation that the IHU will fail sooner than
> the RF systems over the lifetime of the satellite.
> In addition, the Vanderbilt University radiation experiments on Fox-1A,
> Fox-1B, Fox-1C, and Fox-1E are all designed to observe the effects of
> the SAA as well as other charged particle events on COTS components.
> So at least I enjoy what we see in the SAA including resets, in fact the
> occasional reset outside of the SAA or auroral oval is what catches my
> eye since it is unexpected!
> Jerry Buxton, NØJY
> On 2/28/2018 13:55, Roy Dean wrote:
> > Just FYI:
> > In the latest Amsat Journal there is a story about Fox Telemetry that
> > includes an interesting analysis of restarts in relation to the SAA.
> > (apologies, I can't remember the name of the author or the title)
> > By coincidence, one of the YouTube channels I watch is "Curious Droid",
> > which recently released a video on this exact topic. Serendipitous
> > https://youtu.be/ErmEiAJG22A
> > Interested to hear if it's accurate, or just blather - I'm not smart
> > on this topic to distinguish between the two.
> > ---Roy
> > K3RLD
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