Watch、Warning 與 Alert 有何差別？
Watch 表示發生機率升高，Warning 表示預期將出現相關條件，Alert 表示實測已達門檻。也請留意有效期、延長與取消通知。
預報與警報
分開閱讀實際觀測與太空天氣預報。預報描述可能發生的情況，官方公報則補充時間範圍、不確定性與後續修訂。
G0
實際觀測 · NOAA地磁暴
未達分級S0
實際觀測 · NOAA太陽輻射風暴
未達分級R0
實際觀測 · NOAA無線電中斷
未達分級預報與警報
NOAA SWPC ↗未來 3 天 Kp 預報
1.67
Kp預報
Kp 從 0 到 9，達到 5 才進入磁暴分級。它反映全球磁場活動，不是某個城市看見極光的機率。
未來 3 天 Kp 預報官方公報 · 英文原文
:Product: 3-Day Forecast
:Issued: 2026 Nov 01 0030 UTC
# Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
#
A. NOAA Geomagnetic Activity Observation and Forecast
The greatest observed 3 hr Kp over the past 24 hours was 6 (NOAA Scale
G2).
The greatest expected 3 hr Kp for Nov 01-Nov 03 2026 is 4.67 (NOAA Scale
G1).
NOAA Kp index breakdown Nov 01-Nov 03 2026
Nov 01 Nov 02 Nov 03
00-03UT 3.67 2.67 1.67
03-06UT 3.00 2.33 1.33
06-09UT 4.67 (G1) 2.33 1.33
09-12UT 2.67 2.33 1.33
12-15UT 3.67 2.33 1.33
15-18UT 3.33 2.00 1.67
18-21UT 3.00 2.33 1.67
21-00UT 3.33 2.67 1.33
Rationale: G1 (Minor) geomagnetic storm levels are expected on 01 Nov
due to continued influence from a positive polarity CH HSS.
B. NOAA Solar Radiation Activity Observation and Forecast
Solar radiation, as observed by NOAA GOES-18 over the past 24 hours, was
below S-scale storm level thresholds.
Solar Radiation Storm Forecast for Nov 01-Nov 03 2026
Nov 01 Nov 02 Nov 03
S1 or greater 1% 1% 1%
Rationale: No S1 (Minor) or greater solar radiation storms are expected.
No significant active region activity favorable for radiation storm
production is forecast.
C. NOAA Radio Blackout Activity and Forecast
No radio blackouts were observed over the past 24 hours.
Radio Blackout Forecast for Nov 01-Nov 03 2026
Nov 01 Nov 02 Nov 03
R1-R2 1% 1% 1%
R3 or greater 1% 1% 1%
Rationale: No R1 (Minor) or greater radio blackouts are expected. No
significant active region flare activity is forecast.
預報與警報官方公報 · 英文原文
:Product: Forecast Discussion
:Issued: 2026 Nov 01 0030 UTC
# Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
#
Solar Activity
.24 hr Summary...
Solar activity continued at very low levels. Only minor changes were
observed in Regions 4564 (N04E44, Dro/beta) and 4565 (N13E63,
Hsx/alpha).
No Earth-directed CMEs were observed at the available coronagraph
imagery.
.Forecast...
Solar activity is expected to be at very low levels with a chance for
isolated C-class flares through 03 Nov.
Energetic Particle
.24 hr Summary...
The greater than 2 MeV electron flux was at normal to moderate levels.
The greater than 10 MeV proton flux remained steady at background
levels.
.Forecast...
The greater than 2 MeV electron flux is expected to continue at normal
to moderate levels through 02 Nov, with high levels likely by 03 Nov.
The greater than 10 MeV proton flux is anticipated to persist at
background levels through 02 Nov.
Solar Wind
.24 hr Summary...
Solar wind parameters reflected the onset of CIR ahead of a positive
polarity CH HSS. Total magnetic field strength increased to peak of 12
nT late in the period, with sustained periods of southward Bz reaching
as far south as -11 nT. Solar wind speeds increased from ~350 km/s at
the beginning of the UT day to between 550-615 km/s by the end of the
day. Phi angle was predominantly oriented in the positive solar sector.
.Forecast...
Enhanced solar wind conditions are likely to continue through 02 Nov due
to positive polarity CH HSS influences. A return to mostly nominal
conditions is expected over 03 Nov.
Geospace
.24 hr Summary...
The geomagnetic field increased to G2 (Moderate) geomagnetic storm
levels due to the onset of a influence form a positive polarity CH HSS.
.Forecast...
The geomagnetic field is expected to reach G1 (Minor) geomagnetic storm
levels on 01 Nov due to continued influence from a positive polarity CH
HSS. Quiet to unsettled levels are likely on 02 Nov and quiet conditions
are likely on 03 Nov as CH HSS influence wanes.
27 天趨勢展望官方公報 · 英文原文
:Product: 27-day Space Weather Outlook Table 27DO.txt
:Issued: 2026 Oct 26 0118 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC contact on the Web
# https://www.swpc.noaa.gov/content/subscription-services
#
# 27-day Space Weather Outlook Table
# Issued 2026-10-26
#
# UTC Radio Flux Planetary Largest
# Date 10.7 cm A Index Kp Index
2026 Oct 26 88 5 2
2026 Oct 27 84 5 2
2026 Oct 28 84 5 2
2026 Oct 29 84 5 2
2026 Oct 30 84 5 2
2026 Oct 31 84 30 5
2026 Nov 01 84 20 4
2026 Nov 02 82 10 3
2026 Nov 03 82 5 2
2026 Nov 04 82 5 2
2026 Nov 05 82 10 3
2026 Nov 06 82 10 3
2026 Nov 07 82 10 3
2026 Nov 08 84 5 2
2026 Nov 09 84 15 4
2026 Nov 10 82 10 3
2026 Nov 11 82 10 3
2026 Nov 12 80 10 3
2026 Nov 13 80 5 2
2026 Nov 14 80 5 2
2026 Nov 15 80 5 2
2026 Nov 16 80 10 3
2026 Nov 17 80 20 4
2026 Nov 18 80 20 4
2026 Nov 19 80 10 3
2026 Nov 20 80 5 2
2026 Nov 21 80 5 2
太陽黑子活躍區官方公報 · 英文原文
:Product: Summary of Space Weather Observations dayobs.txt
:Issued: 2026 Nov 01 0030 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC contact on the Web
# https://www.swpc.noaa.gov/content/subscription-services
#
# Summary of Space Weather Observations
#
:Solar_Region_Summary: 2026 Oct 31
# Region Location Sunspot Characteristics
# Helio Spot Spot Mag.
# Num Lat.,CMD Long. Area Extent class count class
4563 S19W0* 353 10 1 AXX 1 A
4564 N04E44 202 20 7 DRO 3 B
4565 N13E63 183 40 3 HSX 1 A
預報與警報 · 官方公報 · 英文原文
ALERT: Geomagnetic K-index of 5
Space Weather Message Code: ALTK05
Serial Number: 2060
Issue Time: 2026 Nov 01 0117 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Nov 01 0117 UTC
Synoptic Period: 0000-0300
Active Warning: YES
Noaa Scale: G1 - Minor
Comment:
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
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.WARNING: Geomagnetic K-index of 5 expected
Space Weather Message Code: WARK05
Serial Number: 2274
Issue Time: 2026 Nov 01 0008 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Nov 01 0007 UTC
Valid To: 2026 Nov 01 0900 UTC
Warning Conditions: Persistence
Noaa Scale: G1 - Minor
Comment: Re-issued due to technical issues with end date of previous warning.
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
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.ALERT: Geomagnetic K-index of 6
Space Weather Message Code: ALTK06
Serial Number: 729
Issue Time: 2026 Oct 31 1914 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Oct 31 1914 UTC
Synoptic Period: 1800-2100
Active Warning: YES
Noaa Scale: G2 - Moderate
Comment:
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
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.WARNING: Geomagnetic K-index of 6 expected
Space Weather Message Code: WARK06
Serial Number: 673
Issue Time: 2026 Oct 31 1908 UTC
WARNING: Geomagnetic K-index of 6 expected
Valid From: 2026 Oct 31 1908 UTC
Valid To: 2026 Oct 31 2359 UTC
Warning Conditions: Onset
Noaa Scale: G2 - Moderate
Comment:
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
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.ALERT: Geomagnetic K-index of 5
Space Weather Message Code: ALTK05
Serial Number: 2059
Issue Time: 2026 Oct 31 1907 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Oct 31 1907 UTC
Synoptic Period: 1800-2100
Active Warning: YES
Noaa Scale: G1 - Minor
Comment:
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
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.WARNING: Geomagnetic K-index of 5 expected
Space Weather Message Code: WARK05
Serial Number: 2273
Issue Time: 2026 Oct 31 1904 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Oct 31 1901 UTC
Valid To: 2026 Oct 31 2359 UTC
Warning Conditions: Onset
Noaa Scale: G1 - Minor
Comment:
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
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.ALERT: Geomagnetic K-index of 4
Space Weather Message Code: ALTK04
Serial Number: 2696
Issue Time: 2026 Oct 31 1847 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Oct 31 1845 UTC
Synoptic Period: 1800-2100
Active Warning: YES
Comment:
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
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.WARNING: Geomagnetic K-index of 4 expected
Space Weather Message Code: WARK04
Serial Number: 5445
Issue Time: 2026 Oct 31 1220 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Oct 31 1235 UTC
Valid To: 2026 Nov 01 1500 UTC
Warning Conditions: Onset
Comment:
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
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.WARNING: Geomagnetic K-index of 5 expected
Space Weather Message Code: WARK05
Serial Number: 2272
Issue Time: 2026 Oct 30 2311 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Oct 30 2310 UTC
Valid To: 2026 Oct 31 0600 UTC
Warning Conditions: Onset
Noaa Scale: G1 - Minor
Comment:
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
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.ALERT: Geomagnetic K-index of 4
Space Weather Message Code: ALTK04
Serial Number: 2695
Issue Time: 2026 Oct 30 2240 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Oct 30 2235 UTC
Synoptic Period: 2100-2400
Active Warning: YES
Comment:
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
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.WARNING: Geomagnetic K-index of 4 expected
Space Weather Message Code: WARK04
Serial Number: 5444
Issue Time: 2026 Oct 30 2224 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Oct 30 2223 UTC
Valid To: 2026 Oct 31 1200 UTC
Warning Conditions: Onset
Comment:
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
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.CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Space Weather Message Code: ALTEF3
Serial Number: 3762
Issue Time: 2026 Oct 30 1459 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Continuation of Serial Number: 3761
Begin Time: 2026 Oct 23 1140 UTC
Yesterday Maximum 2MeV Flux: 1228 pfu
Max time: 2026 Oct 29 1630 UTCWATCH: Geomagnetic Storm Category G1 Predicted
Space Weather Message Code: WATA20
Serial Number: 1134
Issue Time: 2026 Oct 29 1910 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Oct 30: None (Below G1) Oct 31: G1 (Minor) Nov 01: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Comment:
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
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.CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Space Weather Message Code: ALTEF3
Serial Number: 3761
Issue Time: 2026 Oct 29 1614 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Continuation of Serial Number: 3760
Begin Time: 2026 Oct 23 1140 UTC
Yesterday Maximum 2MeV Flux: 2493 pfu
Max time: 2026 Oct 28 1805 UTCWATCH: Geomagnetic Storm Category G1 Predicted
Space Weather Message Code: WATA20
Serial Number: 1133
Issue Time: 2026 Oct 28 1638 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Oct 29: None (Below G1) Oct 30: None (Below G1) Oct 31: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Comment: G1 (Minor) geomagnetic storms are likely on 31 Oct primarily due to recurrent, positive polarity coronal hole high speed stream effects.
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
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.CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Space Weather Message Code: ALTEF3
Serial Number: 3760
Issue Time: 2026 Oct 28 0923 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Continuation of Serial Number: 3759
Begin Time: 2026 Oct 23 1140 UTC
Yesterday Maximum 2MeV Flux: 1789 pfu
Max time: 2026 Oct 27 1715 UTCCONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Space Weather Message Code: ALTEF3
Serial Number: 3759
Issue Time: 2026 Oct 27 1138 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Continuation of Serial Number: 3758
Begin Time: 2026 Oct 23 1140 UTC
Yesterday Maximum 2MeV Flux: 3304 pfu
Max time: 2026 Oct 26 1105 UTCCONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Space Weather Message Code: ALTEF3
Serial Number: 3758
Issue Time: 2026 Oct 26 0517 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Continuation of Serial Number: 3757
Begin Time: 2026 Oct 23 1140 UTC
Yesterday Maximum 2MeV Flux: 2864 pfu
Max time: 2026 Oct 25 1820 UTCCONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Space Weather Message Code: ALTEF3
Serial Number: 3757
Issue Time: 2026 Oct 25 0927 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Continuation of Serial Number: 3756
Begin Time: 2026 Oct 23 1140 UTC
Yesterday Maximum 2MeV Flux: 3259 pfu
Max time: 2026 Oct 24 1530 UTCCONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Space Weather Message Code: ALTEF3
Serial Number: 3756
Issue Time: 2026 Oct 24 0904 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Continuation of Serial Number: 3755
Begin Time: 2026 Oct 23 1140 UTC
Yesterday Maximum 2MeV Flux: 3169 pfu
Max time: 2026 Oct 23 1540 UTCALERT: Geomagnetic K-index of 4
Space Weather Message Code: ALTK04
Serial Number: 2694
Issue Time: 2026 Oct 23 1955 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Oct 23 1953 UTC
Synoptic Period: 1800-2100
Active Warning: YES
Comment:
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
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.WARNING: Geomagnetic K-index of 4 expected
Space Weather Message Code: WARK04
Serial Number: 5443
Issue Time: 2026 Oct 23 1927 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Oct 23 1926 UTC
Valid To: 2026 Oct 24 0900 UTC
Warning Conditions: Onset
Comment:
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
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.ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Space Weather Message Code: ALTEF3
Serial Number: 3755
Issue Time: 2026 Oct 23 1147 UTC
ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Threshold Reached: 2026 Oct 23 1140 UTC
Station: GOES-19
Comment: K04W
Space Weather Message Code: WARK04
Serial Number: 5442
Issue Time: 2026 Oct 22 2021 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5441
Valid From: 2026 Oct 21 1616 UTC
Now Valid Until: 2026 Oct 23 0300 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
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.K04W
Space Weather Message Code: WARK04
Serial Number: 5441
Issue Time: 2026 Oct 22 1648 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5440
Valid From: 2026 Oct 21 1616 UTC
Now Valid Until: 2026 Oct 22 2100 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
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.K04W
Space Weather Message Code: WARK04
Serial Number: 5440
Issue Time: 2026 Oct 22 1424 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5439
Valid From: 2026 Oct 21 1616 UTC
Now Valid Until: 2026 Oct 22 1800 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
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.K04W
Space Weather Message Code: WARK04
Serial Number: 5439
Issue Time: 2026 Oct 22 0532 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5438
Valid From: 2026 Oct 21 1616 UTC
Now Valid Until: 2026 Oct 22 1500 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
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.ALERT: Geomagnetic K-index of 5
Space Weather Message Code: ALTK05
Serial Number: 2058
Issue Time: 2026 Oct 22 0003 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Oct 21 2359 UTC
Synoptic Period: 2100-2400
Active Warning: YES
Noaa Scale: G1 - Minor
Comment:
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
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.WARNING: Geomagnetic K-index of 5 expected
Space Weather Message Code: WARK05
Serial Number: 2271
Issue Time: 2026 Oct 21 2228 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Oct 21 2227 UTC
Valid To: 2026 Oct 22 0900 UTC
Warning Conditions: Onset
Noaa Scale: G1 - Minor
Comment:
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
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.ALERT: Geomagnetic K-index of 4
Space Weather Message Code: ALTK04
Serial Number: 2693
Issue Time: 2026 Oct 21 2130 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Oct 21 2059 UTC
Synoptic Period: 1800-2100
Active Warning: YES
Comment:
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
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.想看今晚的情況，該用哪份預報？
先核對發布時間與有效時段。近期規劃主要看未來 3 天預報；27 天展望用來了解大致趨勢，不是逐小時預報。
閃焰發生機率該怎麼看？
它表示指定時段內出現該等級閃焰的可能性，不是持續時間。C、M、X 級機率不需要相加等於 100%。
公開科學觀測與預報可能延遲或修訂。預報不保證能看見極光，也不構成運作安全保證；重要決策請遵循官方指引。