Space Environment Prediction Center





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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. Four sunspot active regions were on the visible disk without any M-class or above flares produced. Due to the continuous effect of the recurrent coronal hole high speed stream, the solar wind speed maintained at about 500 km/s and the geomagnetic field reached minor storm level for 3 hours and active levels for 6 hours. It was quiet to unsettled for the rest of the time.
	Published:	2026-04-22 00:30 UTC
	Forecaster:	016/042

Within the next three days, solar activity is expected to be mainly low with a chance for M-class flares. The geomagnetic field is expected to be mainly quiet to unsettled.
	Published:	2026-04-22 00:30 UTC
	Forecaster:	016/042

During the last week, solar activity was low on 11-13 and 16 Apr, and very low on the other days. 6 active sunspot regions (AR4414-AR4419) were on the visible disk without any M-class or above flare produced. No solar proton event occurred. The F10.7 index increased from 94 sfu to 108 sfu. Due to the effect of a coronal hole high speed stream, the solar wind speed reached a peak value of about 650 km/s between 10 and 11 Apr, and the geomagnetic field was at active levels for 12 hours. The geomagnetic field was quiet to unsettled for the rest of the time. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 15 Apr.
	Published:	2026-04-17 06:30 UTC
	Forecaster:	040/022

Within the next week, solar activity is expected to be mainly low with a chance for M-class flares. Due to the effects of another recurrent coronal hole high speed stream, the geomagnetic field is expected to reach active to storm levels on 17-20 Apr, and quiet to unsettled levels for the rest of the time. The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach minor storm levels on 20-23 Apr.
	Published:	2026-04-17 06:30 UTC
	Forecaster:	040/022

ALERTS


	No space environment alerts have been issued today.


	01:00 UTC 21 Apr 2026	18:00 UTC 20 Apr 2026	16:00 UTC 20 Apr 2026	07:00 UTC 19 Apr 2026	04:00 UTC 19 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:C4.0
	Peak Time:2026 Apr 21 11:50 UTC

	Updated:2026 Apr 22 10:38 UTC
	>>more data<<


	Current 5-min:1.676e-1 /cm².sr.s
	24-hr Max:4.864e-1 /cm².sr.s

	Updated:2026 Apr 22 10:30 UTC
	>>more data<<


	Speed:515.6 km/sec
	Density:5.6 protons/cm³

	Updated:2026 Apr 22 10:40 UTC
	>>more data<<


	Current:Kp=1
	24-hr Max:Kp=4

	Updated:2026 Apr 22 09:00 UTC
	>>more data<<


	Current 5-min:1.481e+3 /cm².sr.s
	Integral Flux:1.226e+8 /cm².sr.day

	Updated:2026 Apr 22 10:30 UTC
	>>more data<<


	10.7cm Flux:112 sfu

	Update:2026 Apr 21 UTC
	>>more data<<


	SSN:68

	Update:2026 Apr 21 UTC
	>>more data<<