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ARCHIVE

DAILY REPORTS

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During the past 24 hours, solar activity was low. There was one sunspot active region 2804 on the visible disk, which produced one C3-class flare. The solar wind speed increased to about 390 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. Due to the effect of the recurrent coronal hole high speed stream, the geomagnetic field is expected to reach active to minor storm levels on 1-2 Mar, and quiet to unsettled on 3 Mar.
	Published:	2021-03-01 00:14 UTC
	Forecaster:	027/010

During the past 24 hours, solar activity was very low without C-class and above flare produced. There was no sunspot region on the visible disk. Due to the effect of CME on 26 Mar, the solar wind speed reached a peak of about 538 km/s. The geomagnetic field was at moderate storm levels for 3 hours, minor storm levels for 3 hours and active levels for 3 hours.
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 to minor storm levels on 2-3 Mar, and at quiet levels on 4 Mar.
	Published:	2021-03-02 00:09 UTC
	Forecaster:	010/039

During the past 24 hours, solar activity was very low without C-class and above flare produced. There were two sunspot regions on the visible disk. Due to the effect of the recurrent coronal hole high speed stream, the solar wind speed reached a peak of about 660 km/s. The geomagnetic field was at minor storm levels for 3 hours and active levels for 6 hours.
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 to minor storm levels on 3-4 Mar. Due to the effect of another recurrent coronal hole high speed stream, the geomagnetic field is expected to be at minor storm levels on 5 Mar.
	Published:	2021-03-03 00:05 UTC
	Forecaster:	039/012

During the past 24 hours, solar activity was low with one C1-class flare produced. There were two sunspot regions on the visible disk. Due to the continous effect of the recurrent coronal hole high speed stream, the solar wind speed maintained at about 600 km/s. The geomagnetic field was at minor storm levels for 9 hours and quiet to unsettled levels for rest of the time. 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. Due to the effect of the recurrent coronal hole high speed stream, the geomagnetic field is expected to be mainly at quiet to unsettled levels isolated with active levels on 4 Mar. Due to the effect of another recurrent coronal hole high speed stream, the geomagnetic field is expected to be at minor storm levels on 5-6 Mar. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 4 Mar.
	Published:	2021-03-04 00:01 UTC
	Forecaster:	012/035

During the past 24 hours, solar activity was very low without C class and above flare produced. There were two sunspot regions on the visible disk. The solar wind speed decreased to about 450 km/s. The geomagnetic field was at active levels for 3 hours and quiet to unsettled levels for rest of the time. 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. Due to the effect of the recurrent coronal hole high speed stream, the geomagnetic field is expected to reach minor storm levels on 5-6 Mar. It will be mainly at quiet to unsettled levels on 7 Mar.
	Published:	2021-03-05 00:21 UTC
	Forecaster:	035/021

During the past 24 hours, solar activity was very low without C class and above flare produced. There was one sunspot regions on the visible disk. The solar wind speed decreased to about 370 km/s. The geomagnetic field was quiet. 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. Due to the effect of the recurrent coronal hole high speed stream, the geomagnetic field is expected to reach minor storm levels on 6-7 Mar. It will be mainly at quiet to unsettled levels on 8 Mar.
	Published:	2021-03-06 00:04 UTC
	Forecaster:	021/026

During the past 24 hours, solar activity was very low without C-class and above flare produced. There was two sunspot regions on the visible disk. The solar wind speed reached a peak of 580 km/s. The geomagnetic field was at active levels for 6 hours and quiet to unsettled levels for rest of the time.
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 reach active levels on 7 Mar. It will be mainly at quiet to unsettled levels on 8-9 Mar.
	Published:	2021-03-07 00:34 UTC
	Forecaster:	029/026

WEEKLY REPORTS

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During last week, solar activity was very low to low. There were three sunspot regions on the visible disk and two C1 flares were produced. The F10.7 index ranged from 73 sfu to 78 sfu. The solar wind speed maintained at about 350 km/s and the geomagnetic field was at quiet to unsettled levels.
Within next week, solar activity is expected to be very low. The geomagnetic field is expected be mainly quiet.
	Published:	2021-01-22 00:56 UTC
	Forecaster:	010

During last week, solar activity was very low to low. There were four sunspot regions on the visible disk and no C class and above flare was produced. The F10.7 index decreased from 78 sfu to 76 sfu. Due to the effect of the current coronal hole high speed stream, the solar wind speed reached a peak of about 610 km/s on 25-26 Jan and the geomagnetic field reached minor storm levels for 3 hours, active levels for 12 hours and quiet to unsettled levels for the rest of the time. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 27-28 Jan.
Within next week, solar activity is expected to be very low. Due to the effect of a recurrent coronal hole high speed stream, the geomagnetic field is expected to reach active and minor storm levels on 31 Jan-2 Feb. It will be quiet to unsettled during other periods. The greater than 2 MeV electron flux at geosynchronous orbit will maintain at minor storm levels on 29 Jan.
	Published:	2021-01-29 04:23 UTC
	Forecaster:	039

During last week, solar activity was very low to low. There was one sunspot region (AR2801) on the visible disk and no C class and above flare was produced. The F10.7 index ranged from 73 sfu to 76 sfu. Due to the effect of the current coronal hole high speed stream, the solar wind speed reached a peak of about 610 km/s on 2-3 Feb and the geomagnetic field was at active levels for 15 hours. It was quiet to unsettled levels for the rest of time. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 29-31 Jan.
Within next week, solar activity is expected to be very low. Due to the effect of a coronal hole high speed stream, the geomagnetic field is expected to reach active levels on 6-7 Feb. It will be quiet to unsettled during other periods.
	Published:	2021-02-05 00:50 UTC
	Forecaster:	010/027

During last week, solar activity was very low to low. There was no sunspot region on the visible disk and no C class and above flare was produced. The F10.7 index ranged from 70 sfu to 76 sfu. Due to the effect of the recurrent coronal hole high speed stream, the solar wind speed reached a peak of about 550 km/s on 6-7 Feb, the geomagnetic field was at minor storm levels for 6 hours and active levels for 9 hours. It was at quiet to unsettled levels for the rest of time.
Within next week, solar activity is expected to be very low. Due to the effect of a coronal hole high speed stream, the geomagnetic field is expected to reach active and above levels on 15-16 Feb and be quiet to unsettled during other periods.
	Published:	2021-02-12 00:28 UTC
	Forecaster:	039

During last week, solar activity was very low to low. There was no sunspot region on the visible disk and no C class and above flare was produced. The F10.7 index ranged from 70 sfu to 72 sfu. Due to the effect of the recurrent coronal hole high speed stream, the solar wind speed reached a peak of about 550 km/s on 13 Feb, the geomagnetic field was at active levels for 3 hours. The solar wind speed reached a peak of about 550 km/s on 16 Feb, the geomagnetic field was at active levels for 9 hours. It was at quiet to unsettled levels for the rest of time.
Within next week, solar activity is expected to be very low. Due to the effect of a coronal hole high speed stream, the geomagnetic field is expected to reach minor storm levels for isolated time periods on 21-22 Feb and be quiet to unsettled during other periods.
	Published:	2021-02-19 01:06 UTC
	Forecaster:	29

During last week, solar activity was very low. There were four sunspot regions on the visible disk and no C class and above flare was produced. The F10.7 index increased from 73sfu to 81sfu. Due to the effect of the current coronal hole high speed stream, the solar wind speed increased to about 500 km/s on 19 Feb and the geomagnetic field reached active levels for 48 hours on 19-23 Feb. Due to the arrival of the coronal mass ejection, the geomagnetic field reached active levels for 15 hours on 24-25 Feb. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 21-24 Feb.
Within next week, solar activity is expected to be very low. Due to the effect of a coronal hole high speed stream, the geomagnetic field is expected to reach active and above levels on 1-2 Mar and be quiet to unsettled during other periods.
	Published:	2021-02-26 01:34 UTC
	Forecaster:	021/029

During last week, solar activity was very low to low. There were four sunspot regions on the visible disk. Three C-class flares were produced. The F10.7 index fluctuated between 71sfu to 81sfu. Due to the effect of the coronal mass ejection produced on 26 Feb, the solar wind speed increased to about 530 km/s on 26 Feb. The geomagnetic field reached mediun storm levels for three hours, minor storm levels for three hours and active levels for three hours,respectively. Due to the effect of the current coronal hole high speed stream, the solar wind speed increased to about 660 km/s on 3 Mar and the geomagnetic field reached minor storm levels for 12 hours, active levels for9 hours on 2-4 Mar. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 26, 28 Feb and 3,4 Mar.
Within next week, solar activity is expected to be mainly very low. Due to the effect of a recurrent coronal hole high speed stream, the geomagnetic field is expected to reach minor storm levels on 5-6 Mar and be quiet to unsettled during other periods. The greater than 2 MeV electron flux at geosynchronous orbit will maintain at minor storm levels on 5 Mar.
	Published:	2021-03-05 01:05 UTC
	Forecaster:	021

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.