Space Environment Prediction Center





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OVERVIEW & FORECAST

Daily Review
Day 1 To 3
Weekly Review
Weekly Forecast

During the past 24 hours, solar activity was low. Nine sunspot active regions were on the visible disk without any M-class or above flare produced. Due to the effect of the recurrent coronal hole high speed stream, the solar wind speed reached a peak of about 550 km/s. The geomagnetic field was at active levels for 6 hours, and was quiet to unsettled for the rest of the time.
	Published:	2026-05-31 00:30 UTC
	Forecaster:	042/012

Within the next three days, solar activity is expected to be low to moderate with a little chance for M-class flares. The geomagnetic field is expected to be mainly quiet to unsettled. It is expected to reach isolated active levels due to the continuous effect of recurrent coronal hole high speed streams.
	Published:	2026-05-31 00:30 UTC
	Forecaster:	042/012

During the last week, solar activity was moderate on 22 May and low on the other days. Fourteen sunspot active regions (AR4439, AR4441, AR4444-AR4455) were on the visible disk with one M-class flare produced. The greater than 10 MeV proton flux at geosynchronous orbit reached the level of a minor solar proton event on 26 May and the maximum proton flux reached 24 pfu. The F10.7 index ranged from 124 sfu to 145 sfu. The geomagnetic field reached active level for 3 hours on 26 May. Due to the effect of the recurrent coronal hole high speed stream, the solar wind speed reached a peak of about 480km/s, and the geomagnetic field reached active level for 3 hours on 28 May. It was quiet to unsettled for the rest of the time. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 22-24 May.
	Published:	2026-05-29 06:30 UTC
	Forecaster:	026/016

Within the next week, solar activity is expected to be low to moderate with a chance for M-class flares. The geomagnetic field is expected to reach isolated active levels on 29 May. It is expected to be quiet to unsettled for the rest of the time.
	Published:	2026-05-29 06:30 UTC
	Forecaster:	026/016

ALERTS


	No space environment alerts have been issued today.


	00:15 UTC 26 May 2026	00:15 UTC 25 May 2026	01:15 UTC 24 May 2026	01:15 UTC 23 May 2026	11:01 UTC 22 May 2026

LATEST DATA



		The magnetic map of the activity area is generated based on the full day longitudinal magnetic field data of the Huairou Solar Observatory in Beijing.				This full-disk Hα image of sun is observed with the 20cm Full-Disc Hα Telescope located at Huairou Solar Observatory Station of Beijing in China.



		Observatories of cosmic ray in SEPC include Beijing station monitoring Neutron intensity variations and Guangzhou station monitoring the intensity variations of East, West, South, North and Vertical components of muon.				This model is an improved geomagnetic K-index current reporting model based on the evaluation of Takahashi, a commonly used international Kp index current reporting model, and its application to Chinese geomagnetic stations.

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	24-hr Max:C4.7
	Peak Time:2026 May 30 11:53 UTC

	Updated:2026 May 31 02:27 UTC
	>>more data<<


	Current 5-min:2.115e-1 /cm².sr.s
	24-hr Max:3.379e-1 /cm².sr.s

	Updated:2026 May 31 02:20 UTC
	>>more data<<


	Speed:483.3 km/sec
	Density:2.5 protons/cm³

	Updated:2026 May 31 02:28 UTC
	>>more data<<


	Current:Kp=4
	24-hr Max:Kp=4

	Updated:2026 May 31 00:00 UTC
	>>more data<<


	Current 5-min:1.972e+2 /cm².sr.s
	Integral Flux:1.628e+7 /cm².sr.day

	Updated:2026 May 31 02:20 UTC
	>>more data<<


	10.7cm Flux:142 sfu

	Update:2026 May 30 UTC
	>>more data<<


	SSN:133

	Update:2026 May 30 UTC
	>>more data<<