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. Five active sunspot regions were on the visible disk without M-class or above flares produced. Due to the continuous effects of a coronal hole high speed stream and the CME from 25 Aug, the solar wind speed miantained at about 460 km/s. The geomagnetic field was at active levels for 9 hours and quiet to unsettled levels for the rest of the time.
	Published:	2026-08-31 00:30 UTC
	Forecaster:	040/015

Within the next three days, solar activity is expected to be very low to low. The geomagnetic field is expected to be mainly quiet to unsettled.
	Published:	2026-08-31 00:30 UTC
	Forecaster:	040/015

During the last week, solar activity was high on 25 Aug, moderate on 21, 24 and 26 Aug and low for the rest of time. Eight sunspot active regions (AR4508, AR4513-AR4519) were on the visible disk with 8 M-class flares produced. No SPE event occurred. The F10.7 index fluctuated between 122 sfu and 143 sfu. The solar wind speed decreased from 550km/s to 250km/s. The geomagnetic field was at quiet to unsettled levels. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 22 Aug.
	Published:	2026-08-28 06:30 UTC
	Forecaster:	016/042

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 active levels to minor storm levels on 28 Aug due to the effects of a coronal hole high speed stream and the CME from 25 Aug. It is expected to be mainly at quiet to unsettled levels for the rest of the time.
	Published:	2026-08-28 06:30 UTC
	Forecaster:	016/042

ALERTS


	No space environment alerts have been issued today.


	12:22 UTC 26 Aug 2026	05:38 UTC 26 Aug 2026	10:13 UTC 25 Aug 2026	06:46 UTC 25 Aug 2026	04:07 UTC 25 Aug 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:C2.3
	Peak Time:2026 Aug 30 16:56 UTC

	Updated:2026 Aug 31 06:21 UTC
	>>more data<<


	Current 5-min:2.234e-1 /cm².sr.s
	24-hr Max:4.074e-1 /cm².sr.s

	Updated:2026 Aug 31 06:15 UTC
	>>more data<<


	Speed:470.3 km/sec
	Density:0.2 protons/cm³

	Updated:2026 Aug 31 06:30 UTC
	>>more data<<


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

	Updated:2026 Aug 31 06:00 UTC
	>>more data<<


	Current 5-min:4.940e+2 /cm².sr.s
	Integral Flux:2.883e+7 /cm².sr.day

	Updated:2026 Aug 31 06:15 UTC
	>>more data<<


	10.7cm Flux:107 sfu

	Update:2026 Aug 30 UTC
	>>more data<<


	SSN:74

	Update:2026 Aug 30 UTC
	>>more data<<