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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 M-class or above flares produced. The solar wind speed increased to about 440 km/s. The geomagnetic field was at quiet to unsettled levels.
	Published:	2025-07-31 00:30 UTC
	Forecaster:	042/012

Within the next three days, the solar activity will be mainly low with a chance for M-class flares. The geomagnetic field is expected to be mainly quiet to unsettled.
	Published:	2025-07-31 00:30 UTC
	Forecaster:	042/012

During the last week, solar activity was low. Twenty-two sunspot regions (AR4135-AR4136, AR4138-AR4140, AR4142-AR4158) were on the visible disk without M-class and above flares produced. The F10.7 index ranged between 143 sfu to 156 sfu. No solar proton event occurred. Due to the continuous effect of the recurrent coronal hole high speed stream, the solar wind speed reached the maximum of 680 km/s and the geomagnetic field reached active levels for 3 hours on 18-19 Jul. Due to the effect of another recurrent coronal hole high speed stream, the solar wind speed peaked about 700 km/s and the geomagnetic field reached minor storm levels for 9 hours, active levels for 24 hours on 22-23 Jul. It 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 18-22 Jul.
	Published:	2025-07-25 06:30 UTC
	Forecaster:	039

Within the next week, solar activity is expected to be low to moderate. Due to the effect of the recurrent coronal hole high speed stream, the geomagnetic field is expected to reach isolated active levels on 30-31 Jul and will be mainly quiet to unsettled for the rest of the time. The greater than 2 MeV electron flux at geosynchronous orbit will maintain at minor storm levels on 25-29 Jul.
	Published:	2025-07-25 06:30 UTC
	Forecaster:	039

ALERTS


	No space environment alerts have been issued today.


	01:15 UTC 27 Jul 2025	00:15 UTC 26 Jul 2025	13:00 UTC 23 Jul 2025	01:15 UTC 23 Jul 2025	22:00 UTC 22 Jul 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:C2.0
	Peak Time:2025 Jul 31 21:59 UTC

	Updated:2025 Jul 31 23:45 UTC
	>>more data<<


	Current 5-min:1.590e-1 /cm².sr.s
	24-hr Max:3.369e-1 /cm².sr.s

	Updated:2025 Jul 31 23:40 UTC
	>>more data<<


	Speed:442 km/sec
	Density:2.3 protons/cm³

	Updated:2025 Jul 31 23:45 UTC
	>>more data<<


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

	Updated:2025 Jul 31 21:00 UTC
	>>more data<<


	Current 5-min:0.000e+0 /cm².sr.s
	Integral Flux:3.398e+7 /cm².sr.day

	Updated:2025 Jul 31 23:40 UTC
	>>more data<<


	10.7cm Flux:145 sfu

	Update:2025 Jul 31 UTC
	>>more data<<


	SSN:131

	Update:2025 Jul 30 UTC
	>>more data<<