Space Environment Prediction Center





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	Coronal Hole Index
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	F10.7 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. Eight active sunspot regions were on the visible disk without M-class or above flares produced. The solar wind speed maintained between 400 km/s and 470 km/s. The geomagnetic field was at quiet to unsettled levels. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm level.
	Published:	2026-09-10 00:30 UTC
	Forecaster:	026/039

Within the next three days, solar activity is expected to be low to moderate with a chance for M-class flares. The geomagnetic field is expected to be quiet to unsettled.
	Published:	2026-09-10 00:30 UTC
	Forecaster:	026/039

During the last week, solar activity was moderate on 2 Sep and low for the rest of the time. Ten active sunspot regions (AR4513, AR4515, AR4517-AR4524) were on the visible disk with 1 M-class flare produced. No solar proton event occurred. The F10.7 index fluctuated between 101 sfu and 116 sfu. Due to the effects of a coronal hole high speed stream and the CME from 25 Aug, the solar wind speed increased to a peak of 470 km/s and the geomagnetic field reached active levels for 27 hours on 28-30 Aug, quiet to unsettled levels for the rest of the time. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 1-2 Sep.
	Published:	2026-09-04 06:30 UTC
	Forecaster:	022/026

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.
	Published:	2026-09-04 06:30 UTC
	Forecaster:	022/026

ALERTS


	No space environment alerts have been issued today.


	01:15 UTC 10 Sep 2026	15:00 UTC 08 Sep 2026	07:00 UTC 08 Sep 2026	16:15 UTC 05 Sep 2026	15:27 UTC 05 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:C1.6
	Peak Time:2026 Sep 10 17:12 UTC

	Updated:2026 Sep 10 18:25 UTC
	>>more data<<


	Current 5-min:2.927e-1 /cm².sr.s
	24-hr Max:3.762e-1 /cm².sr.s

	Updated:2026 Sep 10 18:20 UTC
	>>more data<<


	Speed:453.79 km/sec
	Density:0.1 protons/cm³

	Updated:2026 Sep 10 18:19 UTC
	>>more data<<


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

	Updated:2026 Sep 10 18:00 UTC
	>>more data<<


	Current 5-min:2.397e+3 /cm².sr.s
	Integral Flux:7.386e+7 /cm².sr.day

	Updated:2026 Sep 10 18:20 UTC
	>>more data<<


	10.7cm Flux:109 sfu

	Update:2026 Sep 09 UTC
	>>more data<<


	SSN:107

	Update:2026 Sep 09 UTC
	>>more data<<