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Not milsats, as they're shielded.
even milsats are engineered to presume that the Van Allen Belts are still there.
However, as the Earth's geomagnetic pole-flip progresses ( it isn't steady, it's behavior is rather "quantum", so it'll hold 1 speed for awhile, then suddenly change-speed, as it did a few years ago..
The current north-pole is now heading, iirc, towards Russia )
the Van Allen Belts can .. disappear.
The greatest pole-swing I saw on the maps of ( fossilized ) previous-flips, showed about 30-degrees of swing in a single year.
https://www.researchgate.net/figure/Map-of-virtual-geomagnetic-poles-VGPs-in-the-complex-excursion-obtained-by-combining_fig5_276481462
We're nowhere-near that level, yet, but the standard presumption that "it won't happen" .. isn't as solidly-based as it would appear.
No Van Allen Belts would likely remove ALL our satellites, rather quickly.
As would any Carrington event, if it kept happening sooo long that it got all the geosynchronous satellites.
Shielding has limits.
Engineer for the wrong limits, like all the ocean-ships engineered on the presumption that the max wave they'd ever face would be 40-feet high, then the EU's satellite discovered that there really is an 80-foot wave roughly every day, & you're murdering engineered-potential, & lives, simply by denying just how real Nature can be.
Which is normal.
All the engineering ( chemical included ) which presumes everything's going to be fine, no testing needed..
it's all on the same paradigm.
"That can't happen" .. "protects", just like it did the shuttle that Feynman chewed-out NASA for..
Oh, there's this, too:
What happens when even 20% of the satellites up there are permafritzed, by space weather?
They're now uncontrolled shrapnel, so they don't evade each-other's orbits, anymore, right?
Kessler Syndrome lies that way, & even if a satellite survived the radiation, .. shrapnel's kinda fatal, at space's collision-speeds.
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