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. There were four sunspot regions on the visible disk and two C1-class flares were produced. The solar wind speed decreased to about 390 km/s. The geomagnetic field was quiet.
	Published:	2021-09-27 00:30 UTC
	Forecaster:	010/040

Within the next three days, solar activity is expected to be low. Due to the effects of coronal hole high speed stream and CME on 23 Sep, the geomagnetic field is expected to reach storm levels on 27 Sep. It will be mainly quiet to unsettled on 28-29 Sep.
	Published:	2021-09-27 00:30 UTC
	Forecaster:	010/040

During last week, solar activity was mainly very low to low, with moderate level on 23 Sep. Five active sunspot regions (AR2871-2875) were on the visible disk and produced 2 M-calss and 8 C-class flares. 2 M-class flares were associated with partial CMEs.The F10.7 index increased from 73 sfu to 90 sfu. Due to the effect of the CME from 13 Sep, the geomagnetic field reached minor storm levels for 6 hours and active levels for 9 hours on 17-18 Sep. Due to the effects of CH HSS and the CME from 19 Sep, the geomagnetic field reached active levels for 9 hours on 22-23 Sep. It was quiet to unsettled for the rest time.
	Published:	2021-09-24 06:30 UTC
	Forecaster:	026/029

Within next week, solar activity is expected to be mainly low. Due to the effect of CH HSS, the geomagnetic field is expected to reach active levels on 24-25 Sep. Due to the effects of CH HSS and the CME from 23, the geomagnetic field is expected to reach minor storm levels on 26-27 Sep. It will be mainly quiet to unsettled for the rest time.
	Published:	2021-09-24 06:30 UTC
	Forecaster:	026/029

ALERTS


	No space environment alerts have been issued today.


	15:38 UTC 23 Sep 2021	03:50 UTC 23 Sep 2021	22:00 UTC 17 Sep 2021	19:00 UTC 17 Sep 2021	01:15 UTC 03 Sep 2021

LATEST DATA



		The active region magnetogram is created from the raw full-disk longitudinal magnetogram data observed at Huairou Solar Observatory Station of Beijing in China.				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.

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		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.				The Ionosphere GPS observation network , monitoring the ionospheric scintillation and GPS-TEC with time resolutions of 1 minute and 30 seconds, is located at Fuzhou, Xiamen, Guangzhou, Nanning and Hainan.

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	24-hr Max:B4.5
	Peak Time:2021 Sep 27 11:46 UTC

	Updated:2021 Sep 27 12:45 UTC
	>>more data<<


	Current 5-min:5.487e-1 /cm².sr.s
	24-hr Max:6.670e-1 /cm².sr.s

	Updated:2021 Sep 27 12:35 UTC
	>>more data<<


	Speed:372.4 km/sec
	Density:8.1 protons/cm³

	Updated:2021 Sep 27 12:44 UTC
	>>more data<<


	Current:Kp=1
	24-hr Max:Kp=3

	Updated:2021 Sep 27 12:00 UTC
	>>more data<<


	Current 5-min:4.887e+1 /cm².sr.s
	Integral Flux:7.048e+6 /cm².sr.day

	Updated:2021 Sep 27 12:35 UTC
	>>more data<<


	10.7cm Flux:86 sfu

	Update:2021 Sep 26 UTC
	>>more data<<


	SSN:67

	Update:2021 Sep 26 UTC
	>>more data<<