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ARCHIVE

DAILY REPORTS

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During the past 24 hours, solar activity was low. Four active sunspot regions were on the visible disk without any M-class or above flares produced. The solar wind speed slowly decreased to about 300 km/s. The geomagnetic field was quiet.
Within the next three days, solar activity is expected to be mainly low with a chance for M-class flares. The geomagnetic field is expected to reach active to storm levels on 17-18 Aug due to the effects of the CME on 14 Aug. It will be mainly quiet to unsettled on 19 Aug.
	Published:	2026-08-17 00:01 UTC
	Forecaster:	027/016

During the past 24 hours, solar activity was low. Four active sunspot regions were on the visible disk without any M-class or above flares produced. Due to the effect of recurrent coronal hole high speed stream, the solar wind speed slowly increased to about 410 km/s. The geomagnetic field reached active levels for 6 hours, mainly quiet to unsettled for the rest of the time.
Within the next three days, solar activity is expected to be mainly low with a chance for M-class flares. The geomagnetic field is expected to be mainly at quiet to unsettled levels with isolated active to storm levels on 19-20 Aug due to the effects of two recurrent coronal hole high speed streams.
	Published:	2026-08-17 23:56 UTC
	Forecaster:	026/012

During the past 24 hours, solar activity was low. Four active sunspot regions were on the visible disk without any M-class or above flares produced. Due to the effects of the recurrent coronal hole high speed streams, the solar wind speed reached a peak of about 570 km/s. The geomagnetic field reached minor storm levels for 6 hours and active levels for 6 hours, and was quiet to unsettled for the rest of the time.
Within the next three days, solar activity is expected to be mainly low with a chance for M-class flares. Due to the continuous effects of the recurrent coronal hole high speed streams, the geomagnetic field is expected to reach active to minor storm levels on 19-20 Aug, and be mainly at quiet to unsettled levels on 21 Aug.
	Published:	2026-08-18 23:36 UTC
	Forecaster:	010/039

During the past 24 hours, solar activity was moderate. Five active sunspot regions were on the visible disk with one M1.0 flare produced. Due to the continuous effects of the recurrent coronal hole high speed streams, the solar wind speed maintained at about 570 km/s. The geomagnetic field reached minor storm level for 3 hours and active levels for 6 hours, and was quiet to unsettled for the rest of the time.
Within the next three days, solar activity is expected to be mainly low with a chance for M-class flares. Due to the continuous effects of the recurrent coronal hole high speed streams, the geomagnetic field is expected to reach active to minor storm levels on 20 Aug, and be mainly at quiet to unsettled levels on 21-22 Aug.
	Published:	2026-08-20 00:00 UTC
	Forecaster:	039/010

During the past 24 hours, solar activity was high. Four active sunspot regions were on the visible disk with three M-Class flares produced. The solar wind speed decreased to about 500 km/s. The geomagnetic field was at quiet to unsettled levels.
Within the next three days, solar activity is expected to be mainly moderate with a chance for M-class and above flares. The geomagnetic field is expected to be mainly at quiet to unsettled levels.
	Published:	2026-08-20 23:57 UTC
	Forecaster:	012/040

During the past 24 hours, solar activity was moderate. Four active sunspot regions were on the visible disk with one M-Class flare produced. The solar wind speed decreased to about 480 km/s. The geomagnetic field was at quiet to unsettled levels.
Within the next three days, solar activity is expected to be mainly moderate with a chance for M-class and above flares. The geomagnetic field is expected to be mainly at quiet to unsettled levels. The greater than 2 MeV electron flux at geosynchronous orbit will reach minor storm levels on 22-23 Aug.
	Published:	2026-08-22 00:03 UTC
	Forecaster:	040/025

During the past 24 hours, solar activity was low. Six active sunspot regions were on the visible disk without M-Class flares produced. The solar wind speed decreased to about 430 km/s. The geomagnetic field was quiet.
Within the next three days, solar activity is expected to be low to moderate with a chance for M-class flares. The geomagnetic field is expected to be mainly at quiet to unsettled levels. The greater than 2 MeV electron flux at geosynchronous orbit will reach minor storm levels on 23-25 Aug.
	Published:	2026-08-22 23:50 UTC
	Forecaster:	025/039

WEEKLY REPORTS

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During the last week, solar activity was high on 3-5 Jul, moderate on 7-9 Jul, and low on 6 Jul. Ten sunspot active regions (AR4478-AR4487) were on the visible disk with one X1.3 flare and 33 M-Class flares produced. No solar proton event occurred. The F10.7 index decreased from 187 sfu to 110 sfu. Due to the effects of the three CMEs produced on 30 Jun and 1 Jul, the solar wind speed reached a peak value of about 650 km/s and IMF Bz decreased to about -20 nT between 3 Jul and 5 Jul, during which the geomagnetic field was at major storm levels for 3 hours, moderate storm levels for 12 hours, minor storm level for 9 hours and active levels for 12 hours. The geomagnetic field 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 7 Jul.
Within the next week, solar activity is expected to be low to moderate with chances for M-class flares. The geomagnetic field is expected to reach active levels for isolated time periods on 10 and 11 Jul due to the persistent effects of the recurrent coronal hole high speed stream. Minor geomagnetic storm level is expected on 12-13 Jul as the arrvial of the CME produced on 9 Jul. It will be quiet to unsettled for the rest of the time.
	Published:	2026-07-10 02:13 UTC
	Forecaster:	039/022

During the last week, solar activity was moderate on 12 Jul, and low on other time. Eight sunspot active regions (AR4481-AR4482, AR4485, AR4487-AR4491) were on the visible disk with one M1.1 flare produced. No solar proton event occurred. The F10.7 index decreased from 112 sfu to 100 sfu. Due to the persistent effects of the recurrent coronal hole high speed stream, the solar wind speed reached a peak value of about 660 km/s and the geomagnetic field was at active levels for 3 hours. Due to the effect of the CME produced on 9 Jul and 10 Jul, the solar wind speed reached a peak value of about 580 km/s and the geomagnetic field was at minor storm level for 3 hours and active levels for 9 hours. Due to the effect of the CME produced on 11 Jul, the geomagnetic field reached active levels for 3 hours on 15 Jul . The geomagnetic field 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 11-12 Jul.
Within the next week, solar activity is expected to be low to moderate with chances for M-class flares. The geomagnetic field is expected to reach active to minor storm levels on 21 and 22 Jul due to the effect of the recurrent coronal hole high speed stream. It will be quiet to unsettled for the rest of the time.
	Published:	2026-07-17 02:17 UTC
	Forecaster:	040/012

During the last week, solar activity was moderate on 20-22 Jul, and very low on 17 Jul, and low on other time. Six sunspot active regions (AR4489,AR4491-AR4495) were on the visible disk with five M-class flares produced. No solar proton event occurred. The F10.7 index ranged from 105 sfu to 150 sfu. Due to the effect of the recurrent coronal hole high speed stream, the solar wind speed reached a peak value of about 490 km/s and the geomagnetic field was at active levels for 3 hours. Due to the effects of recurrent coronal hole and CMEs on 21, solar wind speed reached a peak of about 710 km/s. The geomagnetic field reached minor storm levels for six hours. It was quiet to unsettled for the rest of time. It was quiet to unsettled for the rest of time.
Within the next week, solar activity is expected to be low to moderate with chances for M-class flares. The geomagnetic field is expected to reach active levels on 24 Jul. It will be quiet to unsettled for the rest of the time.The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach minor storm levels on 25-28 Jun.
	Published:	2026-07-24 02:33 UTC
	Forecaster:	042/025

During the last week, solar activity was moderate on 26-27, 30 Jul, and low for the rest of the time. Eleven sunspot active regions (AR4489, AR4492-AR4501) were on the visible disk with three M-class flares produced. The greater than 10 MeV proton flux at geosynchronous orbit reached the level of a minor solar proton event on 30, 31 Jul and the maximum proton flux reached 18.1 pfu. The F10.7 index ranged from 143 sfu to 152 sfu. Due to the continuous effect of high speed stream, the geomagnetic field was at active levels for 3 hours. It was quiet to unsettled for the rest of time.
Within the next week, solar activity is expected to be low to moderate with chances for M-class flares. The greater than 10 MeV proton flux at geosynchronous orbit will maintain at minor solar proton event levels on 31 Jul. Due to the effect of CME on 30 Jul, the geomagnetic field is expected to reach minor storm levels on 2 Aug. Due to the effect of a recurrent coronal hole high speed stream, the geomagnetic field is expected to reach active to minor storm levels on 5-6 Aug. It will be quiet to unsettled for the rest of the time.
	Published:	2026-07-31 02:39 UTC
	Forecaster:	026/010

During the last week, solar activity was low. Ten sunspot active regions (AR4492, AR4494-AR4496, AR4498-AR4503) were on the visible disk without M-class or above flare produced. SEP ended on 31 Jul and the maximum proton flux reached 18.1 pfu. The F10.7 index decreased from 148 sfu to 101 sfu. Due to the effect of CME on 30 Jul, the geomagnetic field reached moderate storm levels for 3 hours and active levels for 18 hours on 2-4 Aug. It was quiet to unsettled for the rest of the time.
Within the next week, solar activity is expected to be low to moderate with chances for M-class flares. The geomagnetic field is expected to be mainly quiet to unsettled with isolated active levels on 8 Aug and 11 Aug due to the effect of a recurrent coronal hole high speed stream.
	Published:	2026-08-07 01:21 UTC
	Forecaster:	012/016

During the last week, solar activity was very low on 7-8, 13 Aug and low for the rest of time. Twelve sunspot active regions (AR4498, AR4510, AR4502-AR4511) were on the visible disk without M-class or above flare produced. No SEP event occurred. The F10.7 index fluctuate between 94 sfu and 108 sfu. Due to the effect of recurrent coronal hole high speed stream, the solar wind speed reached a peak of about 480 km/s and the geomagnetic field reached moderate storm levels for 3 hours, minor storm levels for 3 hours and active levels for 9 hours on 8-9 Aug. It was quiet to unsettled for the rest of the time.
Within the next week, solar activity is expected to be mainly low with slight chances for M-class flares. The geomagnetic field is expected to be mainly quiet to unsettled with isolated active levels on 14-15 Aug due to the effect of a coronal hole high speed stream.
	Published:	2026-08-14 00:55 UTC
	Forecaster:	039/015

During the last week, solar activity was high on 20 Aug, moderate on 19 Aug and low for the rest of time. Ten sunspot active regions (AR4503, AR4506-AR4514) were on the visible disk with 4 M-class flares produced. No SPE event occurred. The F10.7 index fluctuated between 114 sfu and 129 sfu. Due to the effect of recurrent coronal hole high speed streams, the solar wind speed reached a peak of about 630 km/s and the geomagnetic field reached minor storm levels for 9 hours, active levels for 18 hours on 17-19 Aug. It was quiet to unsettled for the rest of the time.
Within the next week, solar activity is expected to be mainly moderate with a chance for M-class and above flares. The geomagnetic field is expected to be mainly at quiet to unsettled levels. The greater than 2 MeV electron flux at geosynchronous orbit will reach minor storm levels on 21-23 Aug.
	Published:	2026-08-21 01:20 UTC
	Forecaster:	012/040

SOLAR IMAGES

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