Solar weather watches

[bjdeming]

SWPC, a few minutes ago:

Space Weather Message Code: ALTK09
Serial Number: 8
Issue Time: 2024 May 11 1139 UTC

ALERT: Geomagnetic K-index of 9o
Threshold Reached: 2024 May 11 1128 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
NOAA Scale: G5 - Extreme

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 40 degrees Geomagnetic Latitude.
Induced Currents - Widespread voltage control problems and protective system problems may occur; some power grid systems may experience component failures or protective device trips resulting in blackouts or disruption of service. Pipeline currents can reach hundreds of amps.
Spacecraft - Systems may experience anomalies to include: extensive surface charging, unexpected orientation and attitude changes, uplink/downlink errors, and satellite orbit degradation.
Navigation - Satellite navigation (GPS) may be degraded or unavailable for days.
Radio - HF (high frequency) radio propagation may be impossible in many areas for one to two days.
Aurora - Aurora may be seen as low as Florida to southern Texas and southern California.

 

[bjdeming]

I'm glad old Sol rotates and the trouble-making sunspot is now over near the limb. Still, apparently, enough will reach us to mess up high-frequency radio; also, see Dr. French's thread. =8^O

[NOAA Space Weather Prediction Center on X: "REGION 3664 NOT DONE YET! PRODUCES X8.8 FLARE...LARGEST OF THE SOLAR CYCLE! https://t.co/NJZUdRCrt1" /

[Dr. Ryan French on X: "How large was today’s #SolarFlare in reality? With much of the flare obscured, GOES measured an X8.8-class. However, the Solar Orbiter STIX instrument, which observed the flare unobstructed, estimates a peak between X4-X18 with confidence. https://t.co/ogxYkvN7or" /

Think it takes about three weeks for that group to return to the shooting gallery and, hopefully, by then we will have moved a little more out of range.

 

[bjdeming]

[Dr. Ryan French on X: "The movie of today’s large #SolarFlare really empathises how concentrated/localised the emission is (at least in EUV wavelengths). You can also see the flashing effects of the alternating SDO-AIA fixed/varying-exposure rate! https://t.co/YJ8aCcLzPW" /

Folks, it's time for us to start fighting back. If we've got the tools, let's use 'em.

 

[bjdeming]

Sigh.

[Dr. Ryan French on X: "Before I even had a chance to tweet about the first X-class #SolarFlare from earlier today, there’s already ANOTHER X-class event in progress. But to make it exciting, this new flare is from a yet-unnamed region rotating over the eastern edge. A new player has entered the game! https://t.co/8fQeiUeJXl" /

 

[bjdeming]

In case anyone missed it, here is a good article on the storm, its effects, and how it measured up to biggies like the Carrington storm.

It's also always nice to hear when mitigation work has helped.