Space Environment Prediction Center





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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. Five active sunspot regions were on the visble disk without M-class and above flares produced. The solar wind speed decreased to about 350 km/s. The geomagnetic field was quiet. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels.
	Published:	2025-07-11 00:30 UTC
	Forecaster:	041/025

Within next three days, the solar activity will be low to moderate with a chance for M-class and above flares. The geomagnetic field will be mainly at quiet to unsettled levels with isolated active or minor storm levels due to the effect of the recurrent coronal hole high speed stream.
	Published:	2025-07-11 00:30 UTC
	Forecaster:	041/025

During the last week, solar activity was low. There were 16 active sunspot regions on the visible disk(AR4117, AR4118, AR4120-AR4133) with no M-class or above flares produced. The F10.7 rose from 118 sfu to around 130 sfu. No solar proton events occurred. Due to the effect of the recurrent coronal hole high speed stream, the solar wind speed rose to about 780 km/s on 27 Jun, and the geomagnetic field reached minor storm level for 3 hours and active levels for 6 hours. Due to the effects of the CME from 28 Jun and the recurrent coronal hole high speed stream, the geomagnetic field reached active levels for 6 hours on 3 Jul. From 28 Jun to 2 Jul, the flux of electrons greater than 2 MeV on geosynchronous orbit reached minor storm levels.
	Published:	2025-07-04 06:30 UTC
	Forecaster:	039/026

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 will reach active to minor storm levels on 4-6 Jul. Due to the effect of another recurrent coronal hole high speed stream, the geomagnetic field will reach active to minor storm levels on 8-10 Jul.
	Published:	2025-07-04 06:30 UTC
	Forecaster:	039/026

ALERTS


	No space environment alerts have been issued today.


	04:38 UTC 09 Jul 2025	03:37 UTC 08 Jul 2025	01:00 UTC 07 Jul 2025	22:00 UTC 06 Jul 2025	04:00 UTC 06 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:C8.9
	Peak Time:2025 Jul 10 19:36 UTC

	Updated:2025 Jul 11 00:31 UTC
	>>more data<<


	Current 5-min:2.449e-1 /cm².sr.s
	24-hr Max:3.391e-1 /cm².sr.s

	Updated:2025 Jul 11 00:25 UTC
	>>more data<<


	Speed:348.7 km/sec
	Density:3.0 protons/cm³

	Updated:2025 Jul 11 00:30 UTC
	>>more data<<


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

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


	Current 5-min:1.672e+3 /cm².sr.s
	Integral Flux:1.132e+8 /cm².sr.day

	Updated:2025 Jul 11 00:25 UTC
	>>more data<<


	10.7cm Flux:129 sfu

	Update:2025 Jul 10 UTC
	>>more data<<


	SSN:83

	Update:2025 Jul 09 UTC
	>>more data<<