> I have a new one. A PIC based ('54) product I designed is being
> reset and loosing RAM data in Alaska during Northern Lights events.

Well, you could take the marketing approach:  connect a buzzer to indicate a
reset event, then rename the device a "Northern Lights Detector".  People
can use it to know when to go outside and have a look at the nighttime sky.
(You just *knew* some goof was going to suggest this, didn't ya?)

Seriously though, I had similar problems with a controller that would
occasionally reset when someone started fired up an arc welder nearby.  So I
changed my power supply to be fully transformer-isolated, increased the
electrolytic filter cap size, and added some lovely Motorola 1.5KE-47A
overvoltage transient suppressors (a.k.a. unidirectional zeners ) across the
transformer outputs.  The device now survives welders and lightning too.
(Too bad there wasn't a market for arc welder detectors.)

However, I would suspect that an even like the Northern Lights is more
radiated interference than transmitted, so maybe some shielding is in order
as well...

-Ed
Agile Controls
mailto:evan@direct.ca