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. Five active sunspot regions were on the visble disk without M-class and above flares produced. The solar wind speed decreased to about 360 km/s. The geomagnetic field was at quiet to unsettled levels.
	Published:	2025-09-13 00:30 UTC
	Forecaster:	012/041

Within the next three days, solar activity is expected to be mainly low with a little chance for M-class flares. The geomagnetic field is expected to reach active to minor storm levels on 13-15 Sep due to the effect of the recurrent coronal hole high speed stream.
	Published:	2025-09-13 00:30 UTC
	Forecaster:	012/041

During the last week, solar activity was moderate on 5-6 Sep, and low for the rest of time. Thirteen active sunspot regions (AR4197, AR4199, AR4201-AR4202, AR4206-AR4207, AR4210-AR4216) were on the visible disk with two M-class flares produced. No solar proton event levels happened. The F10.7 index decreased from 149 sfu to 115 sfu. Due to the effect of the recurrent coronal hole high speed stream and CME of 4 Sep, the solar wind speed reached a peak value of 670 km/s, the geomagnetic field was at minor storm levels for 3 hours, active levels for fifteen hours on 6 Sep. The geomagnetic field was at moderate storm levels for 3 hours, active levels for twelve hours on 8-11 Sep, it was quiet to unsettled levels for the rest of time.
	Published:	2025-09-12 06:30 UTC
	Forecaster:	026/012

Within the next week, solar activity is expected to be low to moderate with chances for M-class flares. The geomagnetic field is expected to be mainly at quiet to unsettled levels with isolated active to minor storm levels on 13-15 Sep due to the effect of the recurrent coronal hole high speed stream.
	Published:	2025-09-12 06:30 UTC
	Forecaster:	026/012

ALERTS


	No space environment alerts have been issued today.


	22:00 UTC 09 Sep 2025	21:17 UTC 06 Sep 2025	16:00 UTC 06 Sep 2025	01:21 UTC 05 Sep 2025	13:49 UTC 04 Sep 2025

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:C1.4
	Peak Time:2025 Sep 12 23:00 UTC

	Updated:2025 Sep 13 02:47 UTC
	>>more data<<


	Current 5-min:1.921e-1 /cm².sr.s
	24-hr Max:2.597e-1 /cm².sr.s

	Updated:2025 Sep 13 02:40 UTC
	>>more data<<


	Speed:361 km/sec
	Density:5.3 protons/cm³

	Updated:2025 Sep 13 02:47 UTC
	>>more data<<


	Current:Kp=1
	24-hr Max:Kp=3

	Updated:2025 Sep 13 00:00 UTC
	>>more data<<


	Current 5-min:2.385e+2 /cm².sr.s
	Integral Flux:3.341e+7 /cm².sr.day

	Updated:2025 Sep 13 02:40 UTC
	>>more data<<


	10.7cm Flux:114 sfu

	Update:2025 Sep 12 UTC
	>>more data<<


	SSN:67

	Update:2025 Sep 12 UTC
	>>more data<<