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. Five active sunspot regions were on the visble disk without M-flare and above flare produced. The solar wind speed decreased to about 560 km/s. The geomagnetic field was at active levels for 3 hours. It was quiet to unsettled for the rest of time.
	Published:	2025-08-21 00:30 UTC
	Forecaster:	010/042

Within the next three days, solar activity is expected to be low to moderate. The geomagnetic field is expected to be mainly quiet to unsettled. The greater than 2 MeV electron flux at geosynchronous orbit will reach minor storm levels on 21-23 Aug.
	Published:	2025-08-21 00:30 UTC
	Forecaster:	010/042

During the last week, solar activity was at moderate levels on 8-12 Aug and low levels on 13-14 Aug. Twenty-two active sunspot regions ( AR4161, AR4165-AR4185 ) were on the visible disk with 12 M-class flares produced. The F10.7 index ranged from 130 sfu to 153 sfu. No solar proton event occurred. Due to the effects of the recurrent coronal hole high speed stream and CME on 5 Aug, the solar wind speed reached the peak of 700 km/s and the geomagnetic field reached moderate levels for 3 hours and minor storm levels for 21 hours on 8-9 Aug. It reached active levels for a total of 36 hours on 8-14 Aug. The greater than 2 MeV electron flux at geosynchronous orbit maintained at minor storm levels on 11-14 Aug.
	Published:	2025-08-15 06:30 UTC
	Forecaster:	010

Within the next week, solar activity is expected to be low to moderate with chances for M-class flares. Due to the effect of the recurrent coronal hole high speed stream, the geomagnetic field is expected to reach isolated active levels on 18-19 Jul. Due to the effect of another recurrent coronal hole high speed stream, the geomagnetic field is expected to reach minor storm levels on 18-20 Aug. It will be mainly quiet to unsettled for the rest of the time. The greater than 2 MeV electron flux at geosynchronous orbit will maintained at minor storm levels on 15 Aug.
	Published:	2025-08-15 06:30 UTC
	Forecaster:	010

ALERTS


	No space environment alerts have been issued today.


	19:00 UTC 19 Aug 2025	00:15 UTC 18 Aug 2025	01:15 UTC 17 Aug 2025	01:15 UTC 16 Aug 2025	01:15 UTC 15 Aug 2025

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:C3.3
	Peak Time:2025 Aug 21 00:11 UTC

	Updated:2025 Aug 21 02:14 UTC
	>>more data<<


	Current 5-min:1.713e-1 /cm².sr.s
	24-hr Max:2.431e-1 /cm².sr.s

	Updated:2025 Aug 21 02:05 UTC
	>>more data<<


	Speed:541.5 km/sec
	Density:1.1 protons/cm³

	Updated:2025 Aug 21 02:14 UTC
	>>more data<<


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

	Updated:2025 Aug 21 00:00 UTC
	>>more data<<


	Current 5-min:4.115e+2 /cm².sr.s
	Integral Flux:1.743e+7 /cm².sr.day

	Updated:2025 Aug 21 02:05 UTC
	>>more data<<


	10.7cm Flux:120 sfu

	Update:2025 Aug 20 UTC
	>>more data<<


	SSN:36

	Update:2025 Aug 19 UTC
	>>more data<<