Space Environment Prediction Center





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	Coronal Hole Index
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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. Ten active sunspot regions were on the visble disk with no M-class flare produced. Due to the effect of the CME from 30 Aug, the solar wind speed increased to about 640 km/s, the geomagnetic field reached moderate storm levels for 3 hours and was quiet to unsettled for the rest of time.
	Published:	2025-09-02 00:30 UTC
	Forecaster:	042/026

Within the next three days, solar activity is expected to be moderate with chances for M-class flares. Due to the continuous effects of the CME from 30 Aug, the geomagnetic field is expected to reach major storm levels on 2 Sep, minor storm levels on 3 Sep. The geomagnetic field will be mainly at quiet to unsettled levels on 4 Sep.
	Published:	2025-09-02 00:30 UTC
	Forecaster:	042/026

During the last week, solar activity was moderate on 22-26, 28 Aug and low for the rest of time. Eighteen active sunspot regions (AR4187-AR4204) were on the visible disk with sixteen M-class flares produced. The greater than 10 MeV proton flux at geosynchronous orbit reached the threshold of minor solar proton event levels on 26-27 Aug with a peak of 14 pfu. The F10.7 index increased from 136 sfu to 232 sfu. The geomagnetic field was at quiet to unsettled levels.
	Published:	2025-08-29 06:30 UTC
	Forecaster:	012/029

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 quiet to unsettled.
	Published:	2025-08-29 06:30 UTC
	Forecaster:	012/029

ALERTS


	Space environment alerts have been issued today.


	19:00 UTC 02 Sep 2025	00:00 UTC 02 Sep 2025	22:00 UTC 01 Sep 2025	16:12 UTC 30 Aug 2025	14:23 UTC 30 Aug 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:C6.1
	Peak Time:2025 Sep 02 14:52 UTC

	Updated:2025 Sep 02 23:21 UTC
	>>more data<<


	Current 5-min:1.630e-1 /cm².sr.s
	24-hr Max:1.756e+0 /cm².sr.s

	Updated:2025 Sep 02 23:15 UTC
	>>more data<<


	Speed:506.3 km/sec
	Density:11.3 protons/cm³

	Updated:2025 Sep 02 23:20 UTC
	>>more data<<


	Current:Kp=5
	24-hr Max:Kp=6

	Updated:2025 Sep 02 21:00 UTC
	>>more data<<


	Current 5-min:1.382e+2 /cm².sr.s
	Integral Flux:1.001e+7 /cm².sr.day

	Updated:2025 Sep 02 23:15 UTC
	>>more data<<


	10.7cm Flux:187 sfu

	Update:2025 Sep 02 UTC
	>>more data<<


	SSN:165

	Update:2025 Sep 01 UTC
	>>more data<<