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ARCHIVE

DAILY REPORTS

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During the past 24 hours, solar activity was very low. There were two active regions on the visible disk. The solar wind speed maintained at about 560 km/s. The geomagnetic field was quiet to unsettled.
Within the next three days, solar activity is expected to be very low. The geomagnetic field is expected to be at active levels with possibillity of storm levels on 17-19 May due to the effect of the recurrent coronal hole high speed stream coupled with 14 May CME.
	Published:	2017-05-17 00:05 UTC
	Forecaster:	012/037

During the past 24 hours, solar activity was very low. There was one active region on the visible disk. The solar wind speed decreased to about 450 km/s. The geomagnetic field was quiet to unsettled.
Within the next three days, solar activity is expected to be very low. The geomagnetic field is expected to be at active levels with possibillity of storm levels on 18-20 May due to the effect of the recurrent coronal hole high speed stream coupled with 14 May CME.
	Published:	2017-05-18 00:20 UTC
	Forecaster:	037/021

During the past 24 hours, solar activity was very low. There were two active regions on the visible disk. The solar wind speed decreased to about 400 km/s. The geomagnetic field was at active levels for three hours, and quiet to unsettled levels at other times.
Within the next three days, solar activity is expected to be very low. Due to the effect of the recurrent coronal hole high speed stream, the geomagnetic field is expected to be at active levels with possibillity of storm levels on 19-20 May, and quiet to active levels on 21 May. The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach minor storm levels on 21 May.
	Published:	2017-05-18 23:52 UTC
	Forecaster:	021/036

During the past 24 hours, solar activity was very low. There were two active regions on the visible disk. The solar wind speed increased to about 620 km/s due to the effect of a recurrent coronal hole high speed stream. The geomagnetic field was at quiet to unsettled levels.
Within the next three days, solar activity is expected to be very low. The geomagnetic field is expected to reach strom levels on 20-21 May due to the persistent effect of the recurrent coronal hole high speed stream and quiet to unsettled levels on 22 May. The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach minor storm levels on 21-22 May.
	Published:	2017-05-20 00:08 UTC
	Forecaster:	038/022

During the past 24 hours, solar activity was very low. There were two active regions on the visible disk. The solar wind speed increased to a peak of about 720 km/s due to the peristent effect of the recurrent coronal hole high speed stream. The geomagnetic field was at active levels for 18 hours.
Within the next three days, solar activity is expected to be very low. The geomagnetic field is expected to reach active levels on 21 May due to the persistent effect of the recurrent coronal hole high speed stream and quiet to unsettled levels on 22-23 May. The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach minor storm levels.
	Published:	2017-05-21 00:05 UTC
	Forecaster:	022/035

During the past 24 hours, solar activity was very low. There were 3 active regions on the visible disk. The solar wind speed decreased to about 580 km/s. The geomagnetic field was quiet to unsettled. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels.
Within the next three days, solar activity is expected to be very low. The geomagnetic field is expected to be quiet to unsettled. The greater than 2 MeV electron flux at geosynchronous orbit will reach minor storm levels.
	Published:	2017-05-22 00:13 UTC
	Forecaster:	035/025

During the past 24 hours, solar activity was very low. There were 4 active regions on the visible disk. The solar wind speed decreased to about 560 km/s. The geomagnetic field was quiet to unsettled. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels.
Within the next three days, solar activity is expected to be very low. The geomagnetic field is expected to be quiet to unsettled. The greater than 2 MeV electron flux at geosynchronous orbit will reach minor or moderate storm levels.
	Published:	2017-05-23 00:06 UTC
	Forecaster:	025/032

WEEKLY REPORTS

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During last week, solar activity was high on 2 and 3 Apr, and low on the other days. There were 5 active regions on the visible disk (Region AR2644, AR2645, AR2647-AR2649). There were 7 M-class flares and 42 C-class flares with the largest event of an M5.8 produced by region AR2644. The F10.7 index maintained at between 76 sfu and 112 sfu. Due to the effect of a recurrent coronal hole high speed stream, the solar wind speed reached a peak of 770 km/s, and the geomagnetic field was at minor storm levels for 9 hours and active levels for 9 hours during 31 Mar and 1 Apr. Due to the effect of other south polar recurrent coronal hole high speed stream, the solar wind speed reached a peak of 500 km/s, and the geomagnetic field was at minor storm levels for 6 hours and active levels for 6 hours during 4-5 Apr. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 31 Mar, and reached moderate storm levels on 1-3 Ap.
Within the next week, solar activity is expected to be mainly low. The geomagnetic field is expected quiet to unsettled levels. Due to the effects of the recurrent coronal hole high speed stream, the geomagnetic field is expected reach active levels on 10 Apr.
	Published:	2017-04-07 01:09 UTC
	Forecaster:	038

During last week, solar activity was low on 7-8 Apr, and very low on the other days. There were 3 active regions on the visible disk (Region 2645, 2648 and 2650), which produced 4 C-class flares. The F10.7 index maintained at between 71 sfu and 75 sfu. Due to the effect of a recurrent coronal hole high speed stream, the solar wind speed reached a peak of 600 km/s, and the geomagnetic field was at minor storm levels for 3 hours and active levels for 18 hours during 7-9 Apr. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 10 Apr and 13 Apr.
Within the next week, solar activity is expected to be very low to low. The geomagnetic field is expected to be quiet to unsettled. Due to the effects of the recurrent coronal hole high speed stream, the geomagnetic field is expected reach minor storm levels on 17-19 Apr.
	Published:	2017-04-14 03:08 UTC
	Forecaster:	026/012

During last week, solar activity was low on 17-18 Apr, and very low on the other days. There were 3 active regions on the visible disk (Region 2650-2652), which produced 3 C-class flares. The F10.7 index increased from 73 sfu to 81 sfu. Due to the arrival of CME produced on 10 Apr, the goemagnetic field reached active levels for 3 hours. Due to the effect of a recurrent coronal hole high speed stream, the solar wind speed reached a peak of 600 km/s, and the geomagnetic field was at moderate storm levles for 3 hours, minor storm levels for 9 hours and active levels for 3 hours during 19-20 Apr.
Within the next week, solar activity is expected to be mainly low. Due to the effect of the recurrent coronal hole high speed stream, the geomagnetic field is expected to reach minor or moderate storm levels on 23-26 Apr. It will be quiet to unsettled on the other periods. The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach minor or moderate storm levels on 24-27 Apr.
	Published:	2017-04-21 00:15 UTC
	Forecaster:	025/035

During last week, solar activity was very low. There was no C and above class flare produced in the disk. The F10.7 index is between 78 sfu and 84 sfu. Due to the jointly effect of a CME produced on 18 Apr and a recurrent coronal hole high speed stream, the solar wind speed began to increase on 21 Apr. and reached a peak of 800 km/s on 23 Apr. The geomagnetic field was at moderate storm levles for 12 hours, minor storm levels for 27 hours and active levels for 36 hours during 21-25 Apr. The greater than 2 MeV electron flux at geosynchronous orbit reached at minor storm levels on 23 Apr., and at moderate storm levels on 24-27 Apr.
Within the next week, solar activity is expected to be mainly very low. The geomagnetic field is expected to be quiet to unsettled levels, with active levels on 29-30 April due to the effect of the coronal hole high speed stream. The greater than 2 MeV electron flux at geosynchronous orbit is expected to be at storm levels.
	Published:	2017-04-28 02:13 UTC
	Forecaster:	029/021

During last week, solar activity was very low. There were 4 active ragions on the disk: AR2651, AR2653-AR2655, with no C and above class flare produced. The F10.7 index is between 78 sfu and 74 sfu. Due to the effect of a CME produced on 30 Apr, the geomagnetic field was at active levles for 3 hours, it was quiet for the rest of time. The greater than 2 MeV electron flux at geosynchronous orbit reached at moderate storm levels on 28 Apr., and at minor storm levels on 29 Apr-4 May.
Within the next week, solar activity is expected to be mainly very low. The geomagnetic field is expected to be mainly quiet to unsettled levels. Due to the persistent effect of the CME produced on 30 Apr, the geomagnetic field is expected to reach isolated activel levels on 5 May.
	Published:	2017-05-05 02:38 UTC
	Forecaster:	037

During last week, solar activity was very low. There were 2 active ragions on the disk: AR2654-AR2655, with no C and above class flare produced. The F10.7 index decreased from 74 sfu to 69 sfu. The solar wind speed maintained at about 400 km/s. The geomagnetic field was quiet to unsettled.
Within the next week, solar activity is expected to be mainly very low. Due to the effect of the recurrent coronal hole high speed stream, the geomagnetic field is expected to reach minor storm levels on 15-17 May.
	Published:	2017-05-12 02:55 UTC
	Forecaster:	027/026

During last week, solar activity was very low. There were 3 active regions on the visible disk (Region 2656-2658). The F10.7 index increased slightly from 69 sfu to 72 sfu. Due to the effect of a recurrent coronal hole high speed stream, the solar wind speed began to increase on 15 May, and reached a peak of 650 km/s on 16 May. The geomagnetic field was at avtive levels for 6 hours on 15 May, avtive levels for 3 hours on 18 May, and quiet to unsettled levels at other times.
Within the next week, solar activity is expected to be very low. The geomagnetic field is expected to reach strom levels on 19-21 May due to the effect of a recurrent coronal hole high speed stream and will be quiet to unsettled on other periods.The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach minor or moderate storm levels on 21-25 May.
	Published:	2017-05-19 05:04 UTC
	Forecaster:	021/036

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.