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ARCHIVE

DAILY REPORTS

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During the past 24 hours, solar activity was very low. Three sunspot regions were on the visible disk, without C-class and above flare produced. The solar wind speed increased to about 330 km/s. The geomagnetic field was quiet.
Within the next three days, solar activity is expected to be very low to low. Due to the effect of the coronal hole high speed stream, the geomagnetic field is expected to reach isolated acitve levels on 23 Sep and to be mainly quiet to unsettled for rest of time.
	Published:	2021-09-21 00:05 UTC
	Forecaster:	012/039

During the past 24 hours, solar activity was low. Three sunspot regions were on the visible disk, with three C-class flare produced. The solar wind speed increased to about 360 km/s. The geomagnetic field was quiet to unsettled.
Within the next three days, solar activity is expected to be low. Due to the effect of the coronal hole high speed stream and CME on 19 Sep, the geomagnetic field is expected to reach isolated acitve levels on 23 Sep and to be mainly quiet to unsettled for rest of time.
	Published:	2021-09-22 00:10 UTC
	Forecaster:	039/021

During the past 24 hours, solar activity was low. Five sunspot regions were on the visible disk, with one C-class flare produced. The solar wind speed increased to a maximum 400 km/s. The geomagnetic field was 6 hours for active levels and quiet to unsettled for the rest of time.
Within the next three days, solar activity is expected to be low. Due to the effect of the CME on 19 Sep, the geomagnetic field is expected to reach isolated acitve levels on 23 Sep. Due to the effect of the coronal hole high speed stream, the geomagnetic field is expected to reach isolated acitve levels on 24-25 Sep.
	Published:	2021-09-23 00:02 UTC
	Forecaster:	021/029

During the past 24 hours, solar activity was moderate. Five sunspot regions were on the visible disk, and two M-class flares associated with partial CME were produced. The solar wind speed increased to a maximum 430 km/s. The geomagnetic field was at active levels for 3 hours and quiet to unsettled for the rest of time.
Within the next three days, solar activity is expected to be low. Due to the effect of the coronal hole high speed stream, the geomagnetic field is expected to reach isolated acitve levels on 24-25 Sep and minor storm levels on 26 Sep.
	Published:	2021-09-24 00:22 UTC
	Forecaster:	029/026

During the past 24 hours, solar activity was low. Five sunspot regions were on the visible disk, and one C2 flare were produced. Due to the effect of the coronal hole high speed stream, the solar wind speed increased to a maximum 500 km/s. The geomagnetic field was at quiet to unsettled levels.
Within the next three days, solar activity is expected to be mainly low. Due to the effect of the coronal hole high speed stream, the geomagnetic field is expected to be mainly quiet to unsettled on 25 Sep. Due to the effects of coronal hole high speed stream and CME from 23 Sep, the geomagnetic field is expected to reach storm levels on 26-27 Sep.
	Published:	2021-09-25 00:13 UTC
	Forecaster:	026/027

During the past 24 hours, solar activity was low. Two sunspot regions were on the visible disk, and three C-class flares were produced. The solar wind speed maintained at 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 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 26-27 Sep and be quiet to unsettled on 28 Sep.
	Published:	2021-09-26 00:23 UTC
	Forecaster:	027/010

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.
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 00:05 UTC
	Forecaster:	010/040

WEEKLY REPORTS

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During last week, solar activity was mainly very low. There were three sunspot regions (AR2853-AR2855) on the visible disk, with one C1-class flare produced. The F10.7 index fluctuated between 73 sfu to 74 sfu. Due to the effect of a coronal hole high speed stream , the solar wind speed reached a peak of about 470 km/s on 7 Aug. Due to the effect of another coronal hole high speed stream, the solar wind speed reached a peak of about 500 km/s on 11 Aug. The geomagnetic field was quiet to unsettled.
Within next week, solar activity is expected to be very low.The geomagnetic field is expected to be mainly quiet to unsettled.
	Published:	2021-08-13 00:42 UTC
	Forecaster:	021

During last week, solar activity was mainly very low. There were five sunspot regions (AR2853, AR2855-AR2858) on the visible disk, with one C1 flare produced. The F10.7 index fluctuated between 73 sfu and 75 sfu. Due to the effect of a coronal hole high speed stream , the solar wind speed reached a peak of about 460 km/s on 13 Aug. Due to the effect of another coronal hole high speed stream, the solar wind speed reached a peak of about 500 km/s on 15 Aug. The geomagnetic field was quiet to unsettled.
Within next week, solar activity is expected to be very low.The geomagnetic field is expected to be mainly quiet to unsettled.
	Published:	2021-08-20 01:15 UTC
	Forecaster:	039

During last week, solar activity was mainly low. There were four sunspot regions (AR2858-AR2861) on the visible disk, with 12 C-Class flares produced. The F10.7 index fluctuated between 77 sfu and 89 sfu. Due to the effect of a coronal hole high speed stream , the solar wind speed reached a peak of about 410 km/s on 25 Aug. The geomagnetic field was quiet to unsettled.
Within next week, solar activity is expected to be low. Due to the effect of the CME on 23 Aug, the geomagnetic field is expected to reach acitve levels on 27 Aug and be mainly quiet for rest of time.
	Published:	2021-08-27 01:07 UTC
	Forecaster:	040/012

During last week, solar activity was mainly low. There were 5 active sunspot regions (AR2859-AR2863) on the visible disk with 1 M4 flare and 24 C-class flares produced. The F10.7 index fluctuated between 84 sfu to 91 sfu. Due to the effect of CME from 23 Aug, the solar wind speed reached a peak of 420 km/s, the geomagnetic field reached minor storm level for 3 hours and active levels for 18 hours on 27-28 Aug. It was quiet to unsettled for the rest time. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 28-30 Aug and 1-2 Sep.
Within next week, solar activity is expected to be very low to low.The geomagnetic field is expected to be mainly quiet to unsettled.
	Published:	2021-09-03 00:46 UTC
	Forecaster:	026/010

During last week, solar activity was very low to low. Eight active sunspot regions (AR2863-AR2870) were on the visible disk and produced six C-class flares. The F10.7 index increased from 84 sfu to 100 sfu. Due to the effect of CIR and CME, the solar wind speed reached a peak of 400 km/s, the geomagnetic field was at active levels for 6 hours on 8 Sep. It was quiet to unsettled for the rest time.
Within next week, solar activity is expected to be mainly low.The geomagnetic field is expected to be mainly quiet to unsettled.
	Published:	2021-09-10 01:00 UTC
	Forecaster:	010/027

During last week, solar activity was very low to low. Five active sunspot regions (AR2863-2864, 2866, 2868-2869) were on the visible disk and produced three C-class flares. The F10.7 index decreased from 96 sfu to 73 sfu. Due to the effect of the CME, the geomagnetic field was at active levels for 3 hours on 10 Sep. It was quiet to unsettled for the rest time.
Within next week, solar activity is expected to be very low to low. The geomagnetic field is expected to reach active levels on 17 Sep due to the effect of CME on 13 Sep, and will be mainly quiet to unsettled for the rest time.
	Published:	2021-09-17 00:37 UTC
	Forecaster:	027/026

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.
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 02:40 UTC
	Forecaster:	026/029

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.