地磁活動

今天有磁暴嗎？Kp 指數反映地球磁場的活躍程度；能否看見極光，還取決於位置、天色與天氣。

極光預報

地磁暴

未達分級

實際觀測 · NOAA

太陽輻射風暴

未達分級

實際觀測 · NOAA

無線電中斷

未達分級

實際觀測 · NOAA

太陽風速度

358.20 km/s實際觀測

質子密度

2.73 p/cm³實際觀測

Bt：

7.25 nT實際觀測

Bz：

1.36 nT實際觀測

地磁活躍程度 · Kp

2.33 Kp資料延遲

Dst 地磁指數

-23.00 nT實際觀測

地磁活躍程度 · Kp

2.33

實際觀測

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。

資料延遲 · 2026年11月4日 00:00 UTCNOAA SWPC

Dst 地磁指數

-23 nT

實際觀測

更新於 · 2026年11月4日 05:00 UTCNOAA SWPC

南北半球極光功率

37 GW

預報

北向南向

更新於 · 2026年11月4日 05:40 UTCNOAA SWPC

北半球極光預報圖

NOAA SWPC / OVATION

南半球極光預報圖

NOAA SWPC / OVATION

專業指標與原始公報

GOES · 磁力計

33.9 nT

實際觀測

HpHeHn

更新於 · 2026年11月4日 05:42 UTCNOAA SWPC

磁力計

Natural Resources Canada

預報與警報 · 官方公報 · 英文原文

2026年11月3日 05:02 UTCCONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu

Space Weather Message Code: ALTEF3
Serial Number: 3765
Issue Time: 2026 Nov 03 0502 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Continuation of Serial Number: 3764
Begin Time: 2026 Nov 01 1302 UTC

Yesterday Maximum 2MeV Flux: 4481 pfu
Max time: 2026 Nov 02 1540 UTC

2026年11月2日 12:03 UTCCONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu

Space Weather Message Code: ALTEF3
Serial Number: 3764
Issue Time: 2026 Nov 02 1203 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Continuation of Serial Number: 3763
Begin Time: 2026 Nov 01 1302 UTC

Yesterday Maximum 2MeV Flux: 5350 pfu
Max time: 2026 Nov 01 1550 UTC

2026年11月1日 14:57 UTCK04W

Space Weather Message Code: WARK04
Serial Number: 5446
Issue Time: 2026 Nov 01 1457 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5445
Valid From: 2026 Oct 31 1235 UTC
Now Valid Until: 2026 Nov 01 2359 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.

2026年11月1日 13:02 UTCALERT: Electron 2MeV Integral Flux exceeded 1,000pfu

Space Weather Message Code: ALTEF3
Serial Number: 3763
Issue Time: 2026 Nov 01 1302 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu 
Threshold Reached: 2026 Nov 01 1302 UTC
Station: GOES-19
Comment:

2026年11月1日 01:17 UTCALERT: 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.

2026年11月1日 00:08 UTCWARNING: 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.

2026年10月31日 19:14 UTCALERT: 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.

2026年10月31日 19:08 UTCWARNING: 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.

2026年10月31日 19:07 UTCALERT: 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.

2026年10月31日 19:04 UTCWARNING: 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.

2026年10月31日 18:47 UTCALERT: 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.

2026年10月31日 12:20 UTCWARNING: 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.

2026年10月30日 23:11 UTCWARNING: 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.

2026年10月30日 22:40 UTCALERT: 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.

2026年10月30日 22:24 UTCWARNING: 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.

2026年10月30日 14:59 UTCCONTINUED 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 UTC

2026年10月29日 19:10 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.

2026年10月29日 16:14 UTCCONTINUED 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 UTC

2026年10月28日 16:38 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.

2026年10月28日 09:23 UTCCONTINUED 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 UTC

2026年10月27日 11:38 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 UTC

2026年10月26日 05:17 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 UTC

2026年10月25日 09:27 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 UTC

2026年10月24日 09:04 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 UTC

2026年10月23日 19:55 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.

2026年10月23日 19:27 UTCWARNING: 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.

2026年10月23日 11:47 UTCALERT: 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:

2026年10月22日 20:21 UTCK04W

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.

2026年10月22日 16:48 UTCK04W

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.

2026年10月22日 14:24 UTCK04W

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.

Kp 達到 5，就能看見極光嗎？

Kp 5 達到 G1 級地磁暴門檻，但能否看見仍取決於緯度、黑夜與雲量。出發觀測前，請查看所在地的預報。

Kp 指數反映什麼？

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。

G、S、R 分別代表什麼？

NOAA 用 G 表示地磁暴、S 表示太陽輻射風暴、R 表示無線電中斷，均分為 1 至 5 級。零表示未達分級門檻，不是缺少資料。

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。