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Perhaps you checked a few minutes too soon? > SWPC Forecasters have issued G3 (Strong) Geomagnetic Storm Watches for 04-06 October due to a pair of coronal mas

by dgacmu 2y ago

Perhaps you checked a few minutes too soon? > SWPC Forecasters have issued G3 (Strong) Geomagnetic Storm Watches for 04-06 October due to a pair of coronal mass ejections that are anticipated to arrive over the course of the next three UTC days. Stay tuned for updates as we monitor this activity!

chgs 2y ago
Is a UTC day a different length to a common solar day? At this level of pre soon leap seconds and even sidereal day difference makes no difference
- buescher 2y ago
  Yes, but they probably mean "the next 72 hours from right now given in UTC".
  - chgs 2y ago
    Which would be the same as the next 72 hours in PST
  - Gare 2y ago
    Or maybe they mean "day" as starting from UTC midnight.
    - sevensor 2y ago
      Maybe they’re contrasting with sidereal days?
      - chgs 2y ago
        That was my initial thought, but that’s a difference of 10 mins over 3 days, and that’s orders of magnitudes more precise than should be used.
    - buescher 2y ago
      I'd guess that's actually more likely. Interesting bit of jargon.