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Prof. Sam Lawler

Every chance I've had to interact with satellite operators in conferences, I've asked them about their plans for dealing with solar storms (I'm particularly worried about Starlink, which requires dozens of maneuvers per day to avoid collisions. What if a large fraction shuts down for a few hours?!)

The universal response to my inquiries has been "Don't worry about that, it'll be fine!"

I guess we're going to find out very soon. swpc.noaa.gov/

A map of the aurora forecast for tomorrow night, made by NOAA's Space Weather Prediction Center.  There's a giant red oval that covers all of canada, and extends well into the northern US.  I've never seen an aurora forecast this intense before.
23 comments
Tobias Klausmann

@sundogplanets Do you know of any such maps for Europe? What I could find just mumbled about high and mid latitudes which not exactly helpful.

bigjsl

@sundogplanets like so many modern possible disaster things I bet the modern satellites just ride through this.

Tony Hoyle

@sundogplanets In 2022 49 starlink satellites deorbited due to a solar storm.

There are many more of them up there now...

Winwaed

@tony @sundogplanets they were entirely from one batch which were still in transfer orbits. They knew the storm was coming and decided to launch anyway.
1) they haven't made that mistake again! (Doh!)
2) none of the other 1000s they had in orbit at the time, were lost

Doesn't mean a major storm (Carrington?) won't kill a lot of starlinks, but you can't extrapolate from that one incident

Prof. Sam Lawler

@Winwaed @tony I am fully aware, I got interviewed by the New York Times about that incident :)

Winwaed

@sundogplanets @tony@hoyle.me.uk yes I was replying to @Tony :-)

I'm not a geomag person but it raised eyebrows with some geomag college friends!

Stoneface Vimes

@sundogplanets "don't worry about that, it'll be fine" I usually treat as advice to make alternative arrangements up to, and not excluding, packing our belongings and heading for the hills.

Luk

@capnthommo @sundogplanets hill which is coincidentally the exact spot the starlink satellites will drop to!

Stoneface Vimes

@Luk @sundogplanets I know the exact hill. It has a spacious and solid cave. I'll be ok there.

Linza

@sundogplanets brb headed to the hill to watch for lights / satellites falling out of orbit

James Wells

@sundogplanets
Yeah, I am especially worried about Starlink during this event. And given how closely / densely they operate I worry about a low grade and low altitude Kessler event.

Jonathan Lamothe

@Npars01

β€œIt cannot be officially supplied here and is not officially supplied here,” Peskov told reporters on Monday.

Well that settles it then. Nothing to see here. Move along.

Andrew Zonenberg

@sundogplanets The good news is, collision avoidance is called for at fairly large error bounds and these satellites aren't *that* big.

IOW, these are "we might get within a few km of another satellite" avoidance maneuvers not "we will definitely impact one if we don't take evasive action". So I would expect maybe 1/1000 or less odds of a collision if one of these avoidance maneuvers doesn't take place.

Of course, if thousands of them all become unable to maneuver at once for a bit, that's a lot of dice rolls...

@sundogplanets The good news is, collision avoidance is called for at fairly large error bounds and these satellites aren't *that* big.

IOW, these are "we might get within a few km of another satellite" avoidance maneuvers not "we will definitely impact one if we don't take evasive action". So I would expect maybe 1/1000 or less odds of a collision if one of these avoidance maneuvers doesn't take place.

Prof. Sam Lawler

@azonenberg This is real time data of close approaches: astriacss03.tacc.utexas.edu/ui

And yes, the odds are low, but with dozens happening per day, those low odds add up to high odds very quickly

Anthony
@sundogplanets@mastodon.social @azonenberg@ioc.exchange Just a note of support here: back of the envelope says that ten "one in a thousand" chances a day means 98% chance after one year; two dozen one in a thousand chances a day becomes a near certainty after a year. You don't seem to have special knowledge of this topic Andrew but surely you can see the math suggests there's reason for alarm?
Richard Nairn

@sundogplanets Fascinating. That's incredible to think of how active avoidence needs to be. What could possibliy go wrong if a bunch are disabled and can't manage traffic...

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