Space Environment Prediction Center





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	Chinese Assimilation TEC Model

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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. Three active sunspot regions were on the visible disk without any M-class and above flares produced. Due to the continuous effect of the recurrent coronal hole high speed stream, the solar wind speed maintianed at about 580 km/s. The geomagnetic field reached active levels for 3 hours and quiet to unsettled levels for the rest of the time.
	Published:	2026-04-12 00:30 UTC
	Forecaster:	010/042

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 be mainly quiet to unsettled on 12-14 Apr.
	Published:	2026-04-12 00:30 UTC
	Forecaster:	010/042

During the last week, solar activity was high on 4 Apr, moderate on 3 Apr and 9 Apr, and low on other time. 13 active sunspot regions (AR4399, AR4403-AR4409, AR4411-AR4415) were on the visible disk with 7 M-class flares produced. No solar proton event occurred. The F10.7 index decreased from 136 sfu to 98 sfu. Due to the effect of the CME from 1 Apr and the coronal hole high speed stream, the solar wind speed reached a peak value of about 850 km/s and the geomagnetic field reached major storm levels for 3 hours, moderate storm levels for 6 hours, minor storm levels for 6 hours, and active levels for 21 hours on 3-5 Apr. The geomagnetic field was quiet to unsettled for the rest of the time. The greater than 2 MeV electron flux at geosynchronous orbit was at minor storm levels on 5-9 Apr.
	Published:	2026-04-10 06:30 UTC
	Forecaster:	027/026

Within the next week, solar activity is expected to be mainly low with chance for M-class flares. Due to the effects of the recurrent coronal hole high speed stream, the geomagnetic field is expected to reach active or minor storm levels on 10-11 Apr. It will be quiet to unsettled for the rest of the time.
	Published:	2026-04-10 06:30 UTC
	Forecaster:	027/026

ALERTS


	No space environment alerts have been issued today.


	01:15 UTC 10 Apr 2026	07:50 UTC 09 Apr 2026	01:15 UTC 09 Apr 2026	01:15 UTC 08 Apr 2026	01:15 UTC 07 Apr 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:C2.4
	Peak Time:2026 Apr 12 07:38 UTC

	Updated:2026 Apr 12 22:58 UTC
	>>more data<<


	Current 5-min:2.538e-1 /cm².sr.s
	24-hr Max:2.946e-1 /cm².sr.s

	Updated:2026 Apr 12 22:50 UTC
	>>more data<<


	Speed:480.5 km/sec
	Density:1.1 protons/cm³

	Updated:2026 Apr 12 22:58 UTC
	>>more data<<


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

	Updated:2026 Apr 12 21:00 UTC
	>>more data<<


	Current 5-min:7.193e+2 /cm².sr.s
	Integral Flux:3.496e+8 /cm².sr.day

	Updated:2026 Apr 12 22:50 UTC
	>>more data<<


	10.7cm Flux:99 sfu

	Update:2026 Apr 12 UTC
	>>more data<<


	SSN:42

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