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. Four active sunspot regions were on the visible disk without any M-class or above flares produced. The solar wind speed decreased to about 350 km/s. The geomagnetic field was at active levels for 3 hours and was quiet to unsettled for the rest of time. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm level.
	Published:	2026-09-28 00:30 UTC
	Forecaster:	025/027

Within the next three days, solar activity is expected to be mainly low. The geomagnetic field is expected to be mainly at quiet to unsettled levels.
	Published:	2026-09-28 00:30 UTC
	Forecaster:	025/027

During the last week, solar activity was very low on 18 Sep and low for the rest of the time. Eleven active sunspot regions (AR4532-AR4542) were on the visible disk without any M-class or above flares produced. No Solar Proton Event occurred. The F10.7 index ranged from 96 sfu to 121 sfu. Due to the effects of a recurrent coronal hole high speed stream, the solar wind speed increased to a peak of about 440 km/s and the geomagnetic field was at active levels for 6 hours on 24 Sep and quiet to unsettled levels for the rest of the time.
	Published:	2026-09-25 06:30 UTC
	Forecaster:	042/012

Within the next week, solar activity is expected to be very low to low with chances for C-class flares. The geomagnetic field is expected to reach active levels to minor storm levels on 25-26 Sep due to the continuous effect of a recurrent coronal hole high speed stream. It is expected to be mainly at quiet to unsettled levels for the rest of the time.
	Published:	2026-09-25 06:30 UTC
	Forecaster:	042/012

ALERTS


	Space environment alerts have been issued today.


	01:15 UTC 28 Sep 2026	00:15 UTC 15 Sep 2026	01:15 UTC 12 Sep 2026	01:15 UTC 11 Sep 2026	01:15 UTC 10 Sep 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:C2.5
	Peak Time:2026 Sep 28 15:19 UTC

	Updated:2026 Sep 28 17:17 UTC
	>>more data<<


	Current 5-min:2.262e-1 /cm².sr.s
	24-hr Max:4.012e-1 /cm².sr.s

	Updated:2026 Sep 28 17:10 UTC
	>>more data<<


	Speed:330.98 km/sec
	Density:9.2 protons/cm³

	Updated:2026 Sep 28 17:14 UTC
	>>more data<<


	Current:Kp=1
	24-hr Max:Kp=2

	Updated:2026 Sep 28 15:00 UTC
	>>more data<<


	Current 5-min:3.371e+3 /cm².sr.s
	Integral Flux:1.687e+8 /cm².sr.day

	Updated:2026 Sep 28 17:10 UTC
	>>more data<<


	10.7cm Flux:97 sfu

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


	SSN:67

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