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. Nine active sunspot regions were on the visble disk without any M-class or above flares produced. The solar wind speed decreased to about 450 km/s. The geomagnetic field was at active levels for 3 hours, and quiet to unsettled for the rest of time.
	Published:	2026-03-12 00:30 UTC
	Forecaster:	022/027

Within the next three days, solar activity is expected to be mainly low. The geomagnetic field is expected to be at quiet to unsettled levels on 12-13 Mar, and isolated active to minor storm levels on 14 Mar due to a recurrent coronal high speed stream.
	Published:	2026-03-12 00:30 UTC
	Forecaster:	022/027

During the last week, solar activity was low. Nine active sunspot regions (AR4378-AR4386) were on the visible disk without M-Class flare produced. No solar proton event occured. The F10.7 index ranged from 139 sfu to 148 sfu. The solar wind speed reached a peak value of 440 km/s and the geomagnetic field was at minor storm levels for 3 hours on 3 Mar. It was quiet to unsettled for the rest of time. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 27 Feb to 2 Mar.
	Published:	2026-03-06 06:30 UTC
	Forecaster:	010/042

Within the next week, solar activity is expected to be mainly low with chances for M-class flares. Due to the effect of the recurrent coronal hole high speed streams, the geomagnetic field is expected to reach isolated active or minor storm periods during 6-9 Mar. It will be mainly quiet to unsettled for the rest of time.
	Published:	2026-03-06 06:30 UTC
	Forecaster:	010/042

ALERTS


	No space environment alerts have been issued today.


	01:00 UTC 08 Mar 2026	21:00 UTC 03 Mar 2026	01:15 UTC 03 Mar 2026	01:15 UTC 02 Mar 2026	01:15 UTC 01 Mar 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:C4.0
	Peak Time:2026 Mar 12 10:46 UTC

	Updated:2026 Mar 12 17:54 UTC
	>>more data<<


	Current 5-min:1.890e-1 /cm².sr.s
	24-hr Max:3.028e-1 /cm².sr.s

	Updated:2026 Mar 12 17:50 UTC
	>>more data<<


	Speed:438.2 km/sec
	Density:1.4 protons/cm³

	Updated:2026 Mar 12 17:56 UTC
	>>more data<<


	Current:Kp=2
	24-hr Max:Kp=3

	Updated:2026 Mar 12 15:00 UTC
	>>more data<<


	Current 5-min:9.299e+2 /cm².sr.s
	Integral Flux:8.807e+7 /cm².sr.day

	Updated:2026 Mar 12 17:50 UTC
	>>more data<<


	10.7cm Flux:124 sfu

	Update:2026 Mar 11 UTC
	>>more data<<


	SSN:120

	Update:2026 Mar 11 UTC
	>>more data<<