Conversation

Notices

1. Simbionte (santiago@mastodon.uy)'s status on Monday, 24-Apr-2023 00:38:16 UTC Simbionte

   Tormenta Geo-magnetica severa
   ----------------------------------------------------------
   Severe (G4) Geomagnetic Storm!
   April 23, 2023 @ 17:25 UTC (UPDATED)
   The DSCOVR solar wind data is showing a shock passage at 17:00 UTC and this should be the expected CME reaching the satellite. The solar wind speed is currently near 500 km/s and the Bz component of the IMF continues to point south. An impact to our geomagnetic field is imminent.
   UPDATE #2: A Severe (G4) storm is in Progress. VHF aurora contacts on 2/6m with distorted signals now being made across middle to high latitudes. Widespread aurora across middle to high latitudes once dark outside is likely.

   UPDATE: The anticipated CME swept past Earth at 17:37 UTC. The arrival also pushed proton levels above the minor (S1) radiation storm threshold. With the solar wind now near 550 km/s and the Bz component sharply south (-23nT), moderate (G2) to strong (G3) storm conditions will be possible. Aurora sky watchers should be alert once dark outside.

   ALERT: Geomagnetic K-index of 8, 9-
   Threshold Reached: 2023 Apr 23 1944 UTC
   Synoptic Period: 1800-2100 UTC
   Active Warning: Yes
   NOAA Scale: G4 - Severe

   SUMMARY: Geomagnetic Sudden Impulse
   Observed: 2023 Apr 23 1737 UTC
   Deviation: 48 nT
   Station: BOU

   #astronomy #spaceweather #sun #solaractivity #solar #geomagnetic #storm

   • Simbionte (santiago@mastodon.uy)'s status on Monday, 24-Apr-2023 02:19:11 UTC Simbionte

     in reply to

     Space Weather Message Code: ALTK08
     Serial Number: 28
     Issue Time: 2023 Apr 23 2339 UTC

     ALERT: Geomagnetic K-index of 8, 9-
     Threshold Reached: 2023 Apr 23 2334 UTC
     Synoptic Period: 2100-2400 UTC
     
     Active Warning: Yes
     NOAA Scale: G4 - Severe

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

     Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude.
     Induced Currents - Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify.
     Spacecraft - Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur.
     Navigation - Satellite navigation (GPS) degraded or inoperable for hours.
     Radio - HF (high frequency) radio propagation sporadic or blacked out.
     Aurora - Aurora may be seen as low as Alabama and northern California.