Space Weather Alerts, Watches and Warnings
Issue Time: 2024 Mar 18 1942 UTC
SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Mar 18 1902 UTC
Maximum Time: 2024 Mar 18 1919 UTC
End Time: 2024 Mar 18 1928 UTC
X-ray Class: M6.7
Location: S12E62
NOAA Scale: R2 - Moderate
Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

Issue Time: 2024 Mar 18 1918 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Mar 18 1916 UTC
NOAA Scale: R2 - Moderate
Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http:\/\/www.swpc.noaa.gov\/products\/d-region-absorption-predictions-d-rap.

Issue Time: 2024 Mar 18 1011 UTC
WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Mar 19: None (Below G1) Mar 20: G1 (Minor) Mar 21: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

Issue Time: 2024 Mar 16 2020 UTC
SUMMARY: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2024 Mar 15 2050 UTC
Maximum Time: 2024 Mar 16 0635 UTC
End Time: 2024 Mar 16 1505 UTC
Maximum 10MeV Flux: 16 pfu
NOAA Scale: S1 - Minor
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

Issue Time: 2024 Mar 16 0555 UTC
EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 548
Valid From: 2024 Mar 15 1545 UTC
Now Valid Until: 2024 Mar 16 2359 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S1 - Minor
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

Issue Time: 2024 Mar 15 2106 UTC
ALERT: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2024 Mar 15 2050 UTC
NOAA Scale: S1 - Minor
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

Issue Time: 2024 Mar 15 1544 UTC
WARNING: Proton 10MeV Integral Flux above 10pfu expected
Valid From: 2024 Mar 15 1545 UTC
Valid To: 2024 Mar 16 0600 UTC
Warning Condition: Onset
Predicted NOAA Scale: S1 - Minor
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

Issue Time: 2024 Mar 15 0301 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Mar 15 0259 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Issue Time: 2024 Mar 15 0055 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Mar 15 0055 UTC
Valid To: 2024 Mar 15 1200 UTC
Warning Condition: Onset
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Issue Time: 2024 Mar 13 0739 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Mar 13 0738 UTC
Valid To: 2024 Mar 13 2359 UTC
Warning Condition: Onset
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Issue Time: 2024 Mar 11 1403 UTC
ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2024 Mar 11 1345 UTC
Station: GOES16




Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Issue Time: 2024 Mar 11 0917 UTC
ALERT: Type II Radio Emission
Begin Time: 2024 Mar 11 0853 UTC
Estimated Velocity: 489 km\/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

Issue Time: 2024 Mar 10 1807 UTC
SUMMARY: 10cm Radio Burst
Begin Time: 2024 Mar 10 1530 UTC
Maximum Time: 2024 Mar 10 1532 UTC
End Time: 2024 Mar 10 1533 UTC
Duration: 3 minutes
Peak Flux: 150 sfu
Latest Penticton Noon Flux: 135 sfu



Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

Issue Time: 2024 Mar 10 1238 UTC
SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Mar 10 1200 UTC
Maximum Time: 2024 Mar 10 1213 UTC
End Time: 2024 Mar 10 1220 UTC
X-ray Class: M7.4
Location: S13W35
NOAA Scale: R2 - Moderate
Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

Issue Time: 2024 Mar 10 1233 UTC
ALERT: Type II Radio Emission
Begin Time: 2024 Mar 10 1208 UTC
Estimated Velocity: 714 km\/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

Issue Time: 2024 Mar 10 1232 UTC
SUMMARY: 10cm Radio Burst
Begin Time: 2024 Mar 10 1208 UTC
Maximum Time: 2024 Mar 10 1209 UTC
End Time: 2024 Mar 10 1212 UTC
Duration: 4 minutes
Peak Flux: 340 sfu
Latest Penticton Noon Flux: 135 sfu



Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

Issue Time: 2024 Mar 10 1213 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Mar 10 1211 UTC
NOAA Scale: R2 - Moderate
Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http:\/\/www.swpc.noaa.gov\/products\/d-region-absorption-predictions-d-rap.

Issue Time: 2024 Mar 09 0001 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Mar 08 2359 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Issue Time: 2024 Mar 08 2232 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Mar 08 2231 UTC
Valid To: 2024 Mar 09 1200 UTC
Warning Condition: Onset
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Issue Time: 2024 Mar 08 0552 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4556
Valid From: 2024 Mar 07 1800 UTC
Now Valid Until: 2024 Mar 08 1200 UTC
Warning Condition: Onset
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Issue Time: 2024 Mar 08 0405 UTC
ALERT: Type IV Radio Emission
Begin Time: 2024 Mar 08 0347 UTC


Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.

Issue Time: 2024 Mar 08 0357 UTC
ALERT: Type II Radio Emission
Begin Time: 2024 Mar 08 0340 UTC
Estimated Velocity: 1242 km\/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

Issue Time: 2024 Mar 07 2352 UTC
CANCEL ALERT: Geomagnetic K-index of 4
Cancel Serial Number: 2429
Original Issue Time: 2024 Mar 07 2344 UTC
Comment: Bad magnetometer data at the Ottawa site caused a false Kp=4 (Active) event. Disregard previous K-index of 4 alert. Kp=4 warning still valid until 08 Mar at 0600 UTC.
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Issue Time: 2024 Mar 07 2345 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4555
Valid From: 2024 Mar 07 1800 UTC
Now Valid Until: 2024 Mar 08 0600 UTC
Warning Condition: Onset
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Issue Time: 2024 Mar 07 2344 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Mar 07 2343 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Issue Time: 2024 Mar 07 2321 UTC
ALERT: Type II Radio Emission
Begin Time: 2024 Mar 07 2225 UTC
Estimated Velocity: 904 km\/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

Issue Time: 2024 Mar 07 1756 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Mar 07 1800 UTC
Valid To: 2024 Mar 07 2359 UTC
Warning Condition: Onset
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Issue Time: 2024 Mar 06 1830 UTC
WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Mar 07: None (Below G1) Mar 08: None (Below G1) Mar 09: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

Issue Time: 2024 Mar 06 0404 UTC
ALERT: Type II Radio Emission
Begin Time: 2024 Mar 06 0333 UTC
Estimated Velocity: 1516 km\/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

Issue Time: 2024 Mar 03 2345 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4553
Valid From: 2024 Mar 03 1010 UTC
Now Valid Until: 2024 Mar 04 1200 UTC
Warning Condition: Persistence
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Issue Time: 2024 Mar 03 2124 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2024 Mar 03 2059 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

Issue Time: 2024 Mar 03 1955 UTC
WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2024 Mar 03 1954 UTC
Valid To: 2024 Mar 03 2359 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

Issue Time: 2024 Mar 03 1848 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Mar 03 1844 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

Issue Time: 2024 Mar 03 1731 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Mar 03 1725 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

Issue Time: 2024 Mar 03 1428 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Mar 03 1424 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

Issue Time: 2024 Mar 03 1354 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4552
Valid From: 2024 Mar 03 1010 UTC
Now Valid Until: 2024 Mar 03 2359 UTC
Warning Condition: Persistence
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Issue Time: 2024 Mar 03 1353 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Mar 03 1352 UTC
Valid To: 2024 Mar 03 2359 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

Issue Time: 2024 Mar 03 1334 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Mar 03 1330 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Issue Time: 2024 Mar 03 1009 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Mar 03 1010 UTC
Valid To: 2024 Mar 03 1800 UTC
Warning Condition: Onset
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Issue Time: 2024 Feb 28 0936 UTC
ALERT: Type II Radio Emission
Begin Time: 2024 Feb 28 0907 UTC
Estimated Velocity: 432 km\/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

Issue Time: 2024 Feb 27 0601 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Feb 27 0559 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

Issue Time: 2024 Feb 27 0351 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4550
Valid From: 2024 Feb 27 0113 UTC
Now Valid Until: 2024 Feb 27 1200 UTC
Warning Condition: Persistence
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Issue Time: 2024 Feb 27 0351 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Feb 27 0350 UTC
Valid To: 2024 Feb 27 0900 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

Issue Time: 2024 Feb 27 0305 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Feb 27 0259 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Issue Time: 2024 Feb 27 0113 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Feb 27 0113 UTC
Valid To: 2024 Feb 27 0900 UTC
Warning Condition: Onset
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Issue Time: 2024 Feb 25 1454 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4548
Valid From: 2024 Feb 25 0545 UTC
Now Valid Until: 2024 Feb 26 0600 UTC
Warning Condition: Onset
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Issue Time: 2024 Feb 25 0545 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Feb 25 0545 UTC
Valid To: 2024 Feb 25 1500 UTC
Warning Condition: Onset
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Issue Time: 2024 Feb 22 2341 UTC
SUMMARY: 10cm Radio Burst
Begin Time: 2024 Feb 22 2224 UTC
Maximum Time: 2024 Feb 22 2225 UTC
End Time: 2024 Feb 22 2235 UTC
Duration: 11 minutes
Peak Flux: 240 sfu
Latest Penticton Noon Flux: 173 sfu



Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

Issue Time: 2024 Feb 22 2253 UTC
SUMMARY: X-ray Event exceeded X1
Begin Time: 2024 Feb 22 2208 UTC
Maximum Time: 2024 Feb 22 2234 UTC
End Time: 2024 Feb 22 2243 UTC
X-ray Class: X6.3
Optical Class: 3b
Location: N22E24
NOAA Scale: R3 - Strong
Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.

Issue Time: 2024 Feb 22 2230 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Feb 22 2225 UTC
NOAA Scale: R2 - Moderate
Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http:\/\/www.swpc.noaa.gov\/products\/d-region-absorption-predictions-d-rap.

Issue Time: 2024 Feb 22 1917 UTC
WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Feb 23: None (Below G1) Feb 24: None (Below G1) Feb 25: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

Issue Time: 2024 Feb 22 1226 UTC
ALERT: Type IV Radio Emission
Begin Time: 2024 Feb 22 1158 UTC


Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.

Issue Time: 2024 Feb 22 1008 UTC
ALERT: Type II Radio Emission
Begin Time: 2024 Feb 22 0944 UTC
Estimated Velocity: 154 km\/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

Issue Time: 2024 Feb 22 0647 UTC
SUMMARY: X-ray Event exceeded X1
Begin Time: 2024 Feb 22 0617 UTC
Maximum Time: 2024 Feb 22 0632 UTC
End Time: 2024 Feb 22 0640 UTC
X-ray Class: X1.7
Optical Class: 2b
Location: N14E35
NOAA Scale: R3 - Strong
Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.

Issue Time: 2024 Feb 22 0631 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Feb 22 0629 UTC
NOAA Scale: R2 - Moderate
Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http:\/\/www.swpc.noaa.gov\/products\/d-region-absorption-predictions-d-rap.

Issue Time: 2024 Feb 21 2321 UTC
SUMMARY: X-ray Event exceeded X1
Begin Time: 2024 Feb 21 2252 UTC
Maximum Time: 2024 Feb 21 2307 UTC
End Time: 2024 Feb 21 2314 UTC
X-ray Class: X1.8
Location: N14E39
NOAA Scale: R3 - Strong
Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.

Issue Time: 2024 Feb 21 2306 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Feb 21 2304 UTC
NOAA Scale: R2 - Moderate
Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http:\/\/www.swpc.noaa.gov\/products\/d-region-absorption-predictions-d-rap.

Issue Time: 2024 Feb 21 0413 UTC
ALERT: Type II Radio Emission
Begin Time: 2024 Feb 21 0201 UTC
Estimated Velocity: 627 km\/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.
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