Aurora Watch - Has the CME arrived yet (Oct 30, 2021)?

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Observed at: Edmonton Int'l Airport 3:00 AM MST Wednesday 11 December 2024
Condition: Light Snow
Temperature: -10.9°C
Pressure: 102.5 kPa falling
Visibility: 32 km
Humidity: 87 %
Wind Chill: -18
Dewpoint: -12.7°C
Wind: SSE 14 km/h
Air Quality Health Index: 2
]]> Courtesy of Environment Canada

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Has the CME arrived yet (Oct 30, 2021)?

Saturday, 30 October 2021

The solar wind (particles that constantly stream outward from the sun) has a typical speed of 400 km/s. A coronal mass ejection (CME—the emission from the sun that causes Aurora) typically has a speed of 1000-2000 km/s.

The ACE satellite sits 1.4M km sunward from Earth, measuring the solar wind speed. You can see the data here: ACE SWEPAM DATA. The yellow trace shows the current solar wind speed and when this rapidly increases well above 400 km/s then the CME is 15 minutes away!

Last Updated ( Saturday, 30 October 2021 )

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