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. Eleven sunspot active regions were on the visible disk without any M-class or above flare produced. The solar wind speed maintained at about 410 km/s. The geomagnetic field was at quiet to unsettled levels.
	Published:	2026-05-28 00:30 UTC
	Forecaster:	027/026

Within the next three days, solar activity is expected to be low to moderate with chances for M-class flares. The geomagnetic field is expected to be mainly quiet to unsettled with isolated periods for active levels.
	Published:	2026-05-28 00:30 UTC
	Forecaster:	027/026

During the last week, solar activity was moderate on 16-17 May and low on the other days. Nine sunspot active regions (AR4435-AR4436, AR4438-AR4444) were on the visible disk with four M-class flares produced. No solar proton event occurred. The F10.7 index ranged from 101 sfu to 118 sfu. Due to the effect of a recurrent coronal hole high speed stream, the solar wind speed reached a peak of about 730km/s, and the geomagnetic field reached moderate storm levels for 6 hours, minor storm levels for 15 hours and active levels for 9 hours on 15-16 May. Due to the effect of a CME on 16 May, the solar wind speed reached a peak of about 630km/s and the geomagnetic field reached active levels for 12 hours on 19 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 17-19 May and 21 May.
	Published:	2026-05-22 06:30 UTC
	Forecaster:	012/042

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 22-23 May and isolated active to minor storm levels on 27-28 May due to the effect of a recurrent coronal hole high speed stream. It is expected to be quiet to unsettled for the rest of the time.
	Published:	2026-05-22 06:30 UTC
	Forecaster:	012/042

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:C3.2
	Peak Time:2026 May 28 15:16 UTC

	Updated:2026 May 28 23:40 UTC
	>>more data<<


	Current 5-min:2.443e-1 /cm².sr.s
	24-hr Max:5.439e-1 /cm².sr.s

	Updated:2026 May 28 23:35 UTC
	>>more data<<


	Speed:437.1 km/sec
	Density:4.4 protons/cm³

	Updated:2026 May 28 23:40 UTC
	>>more data<<


	Current:Kp=3
	24-hr Max:Kp=4

	Updated:2026 May 28 21:00 UTC
	>>more data<<


	Current 5-min:2.122e+1 /cm².sr.s
	Integral Flux:1.628e+7 /cm².sr.day

	Updated:2026 May 28 23:35 UTC
	>>more data<<


	10.7cm Flux:145 sfu

	Update:2026 May 28 UTC
	>>more data<<


	SSN:165

	Update:2026 May 27 UTC
	>>more data<<