Geomagnetic Surface

Geomagnetic Monitoring

Track geomagnetic storm conditions with near-real-time magnetic field indices, auroral electrojet activity, and recent disturbance events from NASA DONKI. This monitoring surface focuses on how solar activity translates into geomagnetic response around Earth.

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Kyoto AE quicklook values can lag real time by roughly three weeks or less.
GFZ Hp30
Half-hour geomagnetic nowcast from GFZ Potsdam. Faster than the traditional 3-hour Kp index, giving operators a more timely picture of geomagnetic conditions.

Current Hp30

0.333

Quiet

24h maximum

2.333

Quiet

Recent trend (last 8 readings)

Apr 28, 3:15 PM UTCHp30 0.000ap30 0
Apr 28, 3:45 PM UTCHp30 0.667ap30 3
Apr 28, 4:15 PM UTCHp30 0.667ap30 3
Apr 28, 4:45 PM UTCHp30 1.000ap30 4
Apr 28, 5:15 PM UTCHp30 0.667ap30 3
Apr 28, 5:45 PM UTCHp30 1.000ap30 4
Apr 28, 6:15 PM UTCHp30 2.333ap30 9
Apr 28, 6:45 PM UTCHp30 0.333ap30 2
GFZ Hp30realtime
Observed: Apr 28, 6:45 PM UTCFetched: Apr 28, 7:15 PM UTC
View upstream source
Kyoto AE
Auroral electrojet quicklook data from Kyoto WDC. Note: this data is provisional and can lag real time by up to three weeks.

Latest minute

33

nT (nanotesla)

24h peak

902

nT (nanotesla)

Kyoto AE quicklook values can lag real time by roughly three weeks or less.

Hourly series (last 8 hours)

Apr 5, 4:00 PM UTCMean 325.6Peak 396
Apr 5, 5:00 PM UTCMean 304.1Peak 438
Apr 5, 6:00 PM UTCMean 190.7Peak 309
Apr 5, 7:00 PM UTCMean 64.4Peak 91
Apr 5, 8:00 PM UTCMean 43.9Peak 79
Apr 5, 9:00 PM UTCMean 50.5Peak 63
Apr 5, 10:00 PM UTCMean 44.8Peak 62
Apr 5, 11:00 PM UTCMean 34.4Peak 74
Kyoto WDC AEprovisional
Observed: Apr 5, 11:59 PM UTCFetched: Apr 28, 7:15 PM UTC
View upstream source
Disturbance Lane
Recent geomagnetic storms (GST), interplanetary shocks (IPS), and high-speed streams (HSS) from NASA DONKI that relate to the geomagnetic conditions above.
Interplanetary Shock
Apr 26, 3:51 AM UTC

2026-04-26T03:51:00-IPS-001

Interplanetary Shock
Apr 25, 7:28 PM UTC

2026-04-25T19:28:00-IPS-001

High-Speed Stream
Apr 24, 11:40 PM UTC

2026-04-24T23:40:00-HSS-001

High-Speed Stream
Apr 22, 8:00 AM UTC

2026-04-22T08:00:00-HSS-001

Interplanetary Shock
Apr 22, 2:42 AM UTC

2026-04-22T02:42:00-IPS-001

Geomagnetic Storm
Apr 18, 6:00 AM UTC

2026-04-18T06:00:00-GST-001

About This Data

GFZ Hp30 provides the fastest planetary-activity signal, updated every 30 minutes. Values of 5+ correspond to geomagnetic storm conditions (G1+). This is near-real-time data — much faster than the traditional 3-hour Kp index.

Kyoto AE adds auroral zone context but with a clearly marked lag. The AE index measures electrical currents at ~65–70° latitude. Higher values indicate stronger substorm activity and more visible aurora.

The two indices are shown together by design: Hp30 for fast response, AE for auroral context. Together they give a more complete picture of geomagnetic conditions than either alone.

Snapshot generated: Apr 28, 7:15 PM UTC