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. Eleven sunspot regions were on the visble 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 increased to the peak of about 680 km/s. The geomagnetic field reached active levels for 18 hours and was quiet to unsettled for the rest of the time. The greater than 2 MeV electron flux at geosynchronous orbit remained at minor storm level.
	Published:	2025-07-18 00:30 UTC
	Forecaster:	026/016

Within next three days, the solar activity will be low to moderate with chances for M-class flares. The geomagnetic field is expected to be quiet to unsettled with isolated active periods on 18-19 Jul due to the continuous effect of the recurrent coronal hole high speed stream. The greater than 2 MeV electron flux at geosynchronous orbit will remain at minor storm levels.
	Published:	2025-07-18 00:30 UTC
	Forecaster:	026/016

During the last week, solar activity reached moderate level on 12 Jul and low levels for the rest of the time. Fourteen active sunspot regions ( AR4135-AR4148 ) were on the visible disk with 3 M-class flares produced. The F10.7 index ranged from 128 sfu to 156 sfu. No solar proton event occurred. Due to the effect of the recurrent coronal hole high speed stream, the solar wind speed reached the maximum of 520 km/s and the geomagnetic field reached active levels for 9 hours on 11 Jul. Due to the effect of another recurrent coronal hole high speed stream, the solar wind speed reached the maximum of 700 km/s and the geomagnetic field reached minor storm levels for 15 hours, active levels for 39 hours on 13-17 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 16-17 Jul.
	Published:	2025-07-18 06:30 UTC
	Forecaster:	026/016

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 18-19 Jul. Due to the effect of another recurrent coronal hole high speed stream, the geomagnetic field is expected to reach isolated active or minor storm levels on 22-24 Jul. It 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 18-20 Jul.
	Published:	2025-07-18 06:30 UTC
	Forecaster:	026/016

ALERTS


	No space environment alerts have been issued today.


	01:15 UTC 18 Jul 2025	00:15 UTC 17 Jul 2025	22:00 UTC 16 Jul 2025	10:00 UTC 15 Jul 2025	07:00 UTC 15 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:C3.6
	Peak Time:2025 Jul 18 08:13 UTC

	Updated:2025 Jul 19 00:14 UTC
	>>more data<<


	Current 5-min:2.263e-1 /cm².sr.s
	24-hr Max:4.257e-1 /cm².sr.s

	Updated:2025 Jul 19 00:05 UTC
	>>more data<<


	Speed:509.9 km/sec
	Density:0.8 protons/cm³

	Updated:2025 Jul 19 00:11 UTC
	>>more data<<


	Current:Kp=2
	24-hr Max:Kp=4

	Updated:2025 Jul 19 00:00 UTC
	>>more data<<


	Current 5-min:2.904e+3 /cm².sr.s
	Integral Flux:4.149e+8 /cm².sr.day

	Updated:2025 Jul 19 00:05 UTC
	>>more data<<


	10.7cm Flux:156 sfu

	Update:2025 Jul 18 UTC
	>>more data<<


	SSN:178

	Update:2025 Jul 17 UTC
	>>more data<<