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.

Browse Space Weather EventsOpen Space Weather Alerts

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

2

Quiet

24h maximum

2

Quiet

Recent trend (last 8 readings)

Aug 26, 9:45 PM UTCHp30 0.667ap30 3
Aug 26, 10:15 PM UTCHp30 0.333ap30 2
Aug 26, 10:45 PM UTCHp30 0.667ap30 3
Aug 26, 11:15 PM UTCHp30 0.667ap30 3
Aug 26, 11:45 PM UTCHp30 1.333ap30 5
Aug 27, 12:15 AM UTCHp30 1.333ap30 5
Aug 27, 12:45 AM UTCHp30 1.667ap30 6
Aug 27, 1:15 AM UTCHp30 2.000ap30 7
GFZ Hp30realtime
Observed: Aug 27, 1:15 AM UTCFetched: Aug 27, 1:45 AM 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

62

nT (nanotesla)

24h peak

442

nT (nanotesla)

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

Hourly series (last 8 hours)

Aug 16, 4:00 PM UTCMean 65.5Peak 94
Aug 16, 5:00 PM UTCMean 85.7Peak 109
Aug 16, 6:00 PM UTCMean 70.0Peak 90
Aug 16, 7:00 PM UTCMean 59.4Peak 70
Aug 16, 8:00 PM UTCMean 45.0Peak 72
Aug 16, 9:00 PM UTCMean 28.3Peak 34
Aug 16, 10:00 PM UTCMean 29.9Peak 50
Aug 16, 11:00 PM UTCMean 56.1Peak 66
Kyoto WDC AEprovisional
Observed: Aug 16, 11:59 PM UTCFetched: Aug 27, 1:45 AM 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
Aug 25, 8:33 AM UTC

2026-08-25T08:33:00-IPS-001

Interplanetary Shock
Aug 22, 11:15 PM UTC

2026-08-22T23:15:00-IPS-001

Interplanetary Shock
Aug 22, 1:24 AM UTC

2026-08-22T01:24:00-IPS-001

Interplanetary Shock
Aug 19, 9:24 AM UTC

2026-08-19T09:24:00-IPS-001

High-Speed Stream
Aug 18, 12:40 PM UTC

2026-08-18T12:40:00-HSS-001

Interplanetary Shock
Aug 17, 11:04 AM UTC

2026-08-17T11:04:00-IPS-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: Aug 27, 1:45 AM UTC