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Space weather

130 readingsKp index at 1.00, quiet field, solar wind at 294 km/s, Bz component at 3.0 nT, radio flux at 92 sfu, strongest flare of class B3.0 over six hours, readings of 02 Oct 2026, 03:00 UTC.

Planetary Kp index over seven days

Kp measures the agitation of the Earth's magnetic field on a scale of 0 to 9, from the readings of a worldwide network of observatories. Below 4, the field is quiet or slightly unsettled. From 5 upwards, NOAA opens its geomagnetic storm scale, G1 to G5. The dial gives the latest reading, the bars the past seven days in three hour steps: hover one to read its value and time, click a level in the legend to keep only that one.

03579
Kp 1.00reading of 02 Oct 2026, 03:00 UTC
25 Sept 2026, 00:0002 Oct 2026, 03:00
MeasureValueReading
Latest Kp1.0002 Oct 2026, 03:00
Highest Kp over the period4.0025 Sept 2026, 06:00
Readings above the storm threshold0 / 58over 7 days

The Sun and interplanetary space

These quantities are snapshots, not series: they are the latest readings published by NOAA at the time of the refresh. No filter touches them.

QuantityValueReading
Solar wind speed294 km/s02 Oct 2026, 06:52
Interplanetary magnetic fieldBt 5.0 nT, Bz 3.0 nT02 Oct 2026, 06:52
10.7 cm radio flux92 sfu01 Oct 2026, 20:00
Strongest flare over 6 hoursB3.002 Oct 2026, 06:20

NOAA bulletins

The prediction centre issues a watch when a phenomenon becomes likely, a warning when it is expected, an alert when a threshold is crossed, and a summary once the episode is over.

Kind of bulletin

Period

A watch announces a likely phenomenon, a warning an expected one, an alert a threshold already crossed, a summary a finished episode. Click a header to sort, or search a product code.

68 bulletins

AlertCONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu01 Oct 2026, 14:30
WatchWATCH: Geomagnetic Storm Category G1 Predicted01 Oct 2026, 14:28
AlertALERT: Electron 2MeV Integral Flux exceeded 1,000pfu30 Sept 2026, 10:04
AlertALERT: Type IV Radio Emission30 Sept 2026, 03:39
AlertALERT: Type II Radio Emission30 Sept 2026, 03:38
WatchWATCH: Geomagnetic Storm Category G1 Predicted29 Sept 2026, 13:01
AlertCONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu29 Sept 2026, 05:02
AlertCONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu28 Sept 2026, 05:00
AlertCONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu27 Sept 2026, 05:02
AlertALERT: Geomagnetic K-index of 427 Sept 2026, 00:40
WarningWARNING: Geomagnetic K-index of 4 expected27 Sept 2026, 00:35
AlertALERT: Electron 2MeV Integral Flux exceeded 1,000pfu26 Sept 2026, 15:51
AlertALERT: Geomagnetic K-index of 425 Sept 2026, 21:58
WarningWARNING: Geomagnetic K-index of 4 expected25 Sept 2026, 21:55
WarningWARNING: Geomagnetic K-index of 5 expected25 Sept 2026, 08:35
AlertALERT: Geomagnetic K-index of 425 Sept 2026, 03:00
WarningWARNING: Geomagnetic K-index of 4 expected25 Sept 2026, 02:26
WarningEXTENDED WARNING: Geomagnetic K-index of 4 expected24 Sept 2026, 14:30
AlertALERT: Geomagnetic K-index of 424 Sept 2026, 09:52
WarningWARNING: Geomagnetic K-index of 4 expected24 Sept 2026, 09:45
WatchWATCH: Geomagnetic Storm Category G1 Predicted21 Sept 2026, 18:32
WarningEXTENDED WARNING: Geomagnetic K-index of 4 expected16 Sept 2026, 05:38
AlertALERT: Geomagnetic K-index of 416 Sept 2026, 00:34
WarningWARNING: Geomagnetic K-index of 5 expected15 Sept 2026, 18:56
WarningWARNING: Geomagnetic K-index of 4 expected15 Sept 2026, 18:50
WatchWATCH: Geomagnetic Storm Category G1 Predicted15 Sept 2026, 17:37
AlertALERT: Geomagnetic K-index of 414 Sept 2026, 18:02
WarningWARNING: Geomagnetic K-index of 4 expected14 Sept 2026, 16:54
WatchWATCH: Geomagnetic Storm Category G1 Predicted14 Sept 2026, 15:47
AlertCONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu14 Sept 2026, 11:03
AlertCONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu13 Sept 2026, 08:27
AlertCONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu12 Sept 2026, 06:45
AlertCONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu11 Sept 2026, 05:01
AlertCONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu11 Sept 2026, 00:45
AlertALERT: Electron 2MeV Integral Flux exceeded 1,000pfu10 Sept 2026, 13:06
AlertCONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu09 Sept 2026, 05:38
AlertCONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu09 Sept 2026, 05:35
AlertALERT: Geomagnetic K-index of 508 Sept 2026, 17:51
WarningEXTENDED WARNING: Geomagnetic K-index of 4 expected08 Sept 2026, 17:30
WarningEXTENDED WARNING: Geomagnetic K-index of 5 expected08 Sept 2026, 17:27
WatchWATCH: Geomagnetic Storm Category G2 Predicted08 Sept 2026, 17:02
AlertALERT: Electron 2MeV Integral Flux exceeded 1,000pfu08 Sept 2026, 16:08
AlertALERT: Geomagnetic K-index of 508 Sept 2026, 07:34
WarningEXTENDED WARNING: Geomagnetic K-index of 5 expected08 Sept 2026, 05:46
WarningEXTENDED WARNING: Geomagnetic K-index of 4 expected08 Sept 2026, 05:45
WarningWARNING: Geomagnetic K-index of 5 expected07 Sept 2026, 20:01
WatchWATCH: Geomagnetic Storm Category G1 Predicted07 Sept 2026, 16:35
WarningEXTENDED WARNING: Geomagnetic K-index of 4 expected07 Sept 2026, 14:13
AlertALERT: Geomagnetic K-index of 407 Sept 2026, 11:08
WarningWARNING: Geomagnetic K-index of 4 expected07 Sept 2026, 08:55
AlertALERT: Electron 2MeV Integral Flux exceeded 1,000pfu06 Sept 2026, 18:24
WatchWATCH: Geomagnetic Storm Category G1 Predicted06 Sept 2026, 12:12
SummarySUMMARY: Proton Event 10MeV Integral Flux exceeded 10pfu06 Sept 2026, 11:55
WarningEXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected05 Sept 2026, 23:58
SummarySUMMARY: Proton Event 100MeV Integral Flux exceeded 1pfu05 Sept 2026, 23:41
WarningCANCEL WARNING: Proton 100MeV Integral Flux above 1pfu expected05 Sept 2026, 23:39
AlertALERT: Proton Event 10meV Integral Flux exceeded 10pfu05 Sept 2026, 16:33
WarningWARNING: Proton 10MeV Integral Flux above 10pfu expected05 Sept 2026, 16:20
AlertALERT: Proton Event 100MeV Integral Flux exceeded 1pfu05 Sept 2026, 15:56
WarningWARNING: Proton 100MeV Integral Flux above 1pfu expected05 Sept 2026, 15:55
AlertALERT: Type IV Radio Emission04 Sept 2026, 20:07
AlertALERT: Type II Radio Emission04 Sept 2026, 20:06
AlertCONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu04 Sept 2026, 12:08
AlertALERT: Type II Radio Emission03 Sept 2026, 16:44
AlertCONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu03 Sept 2026, 10:31
AlertALERT: Type IV Radio Emission02 Sept 2026, 19:55
AlertALERT: Type II Radio Emission02 Sept 2026, 19:45
AlertCONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu02 Sept 2026, 10:14

68 bulletins shown out of the 68 the NOAA feed keeps. Titles are those of the source.

Source and method

Every figure on this page comes from the NOAA Space Weather Prediction Center, the United States oceanic and atmospheric agency. They are requested by our servers and cached for 15 minutes: your browser never calls NOAA.

The Kp index is published every three hours and covers seven days here. Solar wind speed, magnetic field and radio flux are latest readings, published continuously. The flare class is computed from the 0.1 to 0.8 nanometre X-ray flux measured by the GOES satellite, over the past six hours.

Source: NOAA Space Weather Prediction Center, swpc.noaa.gov. Readings fetched server side and cached for 15 minutes. Times in universal time.