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	Coronal Hole Index
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ARCHIVE

DAILY REPORTS

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During the past 24 hours, solar activity was very low. Two active regions were on the visible disk without C and above flares produced. A partial CME was observed from the west of the visible disk. The solar wind speed increased to about 350 km/s. The geomagnetic field was at quiet levels.
Within the next three days, solar activity is expected to be very low. The geomagnetic field is expected to be mainly quiet on 26-27 July, and be isolated active or minor storm levels on 28 July with the effects of a coronal hole high speed stream and the partial CMEs.
	Published:	2021-07-26 00:32 UTC
	Forecaster:	029/021

During the past 24 hours, solar activity was very low. Two active regions were on the visible disk without C class and above flares produced. The solar wind speed fluctuated at about 330 km/s. The geomagnetic field was at quiet levels.
Within the next three days, 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 be isolated active levels on 28 July and quiet to unsettled during the other time.
	Published:	2021-07-27 00:20 UTC
	Forecaster:	021/029

During the past 24 hours, solar activity was very low. Two active regions were on the visible disk without C class and above flares produced. The solar wind speed maintained at about 330 km/s. The geomagnetic field was at quiet to unsettled levels.
Within the next three days, 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 be isolated active levels on 28 July and quiet to unsettled during the other time.
	Published:	2021-07-28 00:10 UTC
	Forecaster:	029/021

During the past 24 hours, solar activity was very low. There was no sunspot region on the visible disk without C-Class and above flare produced. Due to the effect of the coronal hole high speed stream, the solar wind speed increased to about 540 km/s. The geomagnetic field reached active levels for 3 hours and it was at quiet to unsettled levels for the rest of the time.
Within the next three days, solar activity is expected to be very low. The geomagnetic field is expected to be quiet to unsettled.
	Published:	2021-07-29 00:00 UTC
	Forecaster:	021/012

During the past 24 hours, solar activity was very low. There was no sunspot region on the visible disk without C-Class and above flare produced. The solar wind speed decreased to about 490 km/s. 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 be mainly quiet to unsettled.
	Published:	2021-07-30 00:00 UTC
	Forecaster:	012/010

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. The solar wind speed maintained at about 470 km/s. The geomagnetic field was at quiet levels.
Within the next three days, solar activity is expected to be very low. The geomagnetic field is expected to be mainly quiet to unsettled.
	Published:	2021-07-30 23:55 UTC
	Forecaster:	010/039

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. The solar wind speed decreased to about 410 km/s. The geomagnetic field was at quiet levels.
Within the next three days, solar activity is expected to be very low. The geomagnetic field is expected to be mainly quiet to unsettled.
	Published:	2021-08-01 00:14 UTC
	Forecaster:	039/040

WEEKLY REPORTS

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During last week, solar activity was very low. There were 2 sunspot regions (AR2832-AR2833) on the visible disk. There were no C-class and above flares produced. The F10.7 index fluctuated between 69 sfu to 78 sfu. The geomagnetic field was at active levels for 3 hours on 12 Jun. Due to the effect of the recurrent coronal hole high speed stream, the solar wind speed reached a peak of about 620 km/s and the geomagnetic field was at minor storm level for 3 hours and active levels for 6 hours on 15-16 Jun. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 17 Jun.
Within next week, solar activity is expected to be mainly very low. The geomagnetic field is expected to be quiet to unsettled. The greater than 2 MeV electron flux at geosynchronous orbit will maintain at minor storm levels on 18-19 Jun.
	Published:	2021-06-18 03:03 UTC
	Forecaster:	027/039

During last week, solar activity was very low to low. There were two sunspot regions (AR2833-AR2834) on the visible disk. There was one C-class flare produced. The F10.7 index fluctuated between 76 sfu to 81 sfu. The geomagnetic field was quiet to unsettled. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 18-21 Jun.
Within next week, solar activity is expected to be mainly very low. The geomagnetic field is expected to be quiet to unsettled.
	Published:	2021-06-25 04:40 UTC
	Forecaster:	029

During last week, solar activity was very low to low. There were four sunspot regions (AR2833, AR2835-AR2837) on the visible disk. There were five C-class flares produced. The F10.7 index fluctuated between 82 sfu to 94 sfu. Due to the effect of a coronal hole high speed stream, the solar wind speed reached a peak of about 520 km/s and the geomagnetic field reached active levels for 6 hours on 30 Jun.The geomagnetic field was quiet to unsettled for the rest of time.
Within next week, solar activity is expected to be very low to low. The geomagnetic field is expected to be mainly quiet to unsettled and reach isolated active levels on 3 Jul due to the effect of a weak CME on 29 Jun.
	Published:	2021-07-02 04:06 UTC
	Forecaster:	039

During last week, solar activity was high on 3 Jul, and moderate on 4 Jul, and very low to low for the other day. There were six sunspot regions (AR2835-AR2840) on the visible disk. There were one X1.5, three M-class flares produced from AR2838. The F10.7 index decreased from 95 sfu to 73 sfu. The solar wind speed decreased from 510 km/s to 320 km/s. The geomagnetic field was quiet to unsettled.
Within next week, solar activity is expected to be very low to low. The geomagnetic field is expected to be mainly quiet to unsettled and reach isolated active or minor storm levels on 12-13 Jul due to the effect of the recurrent coronal hole high speed stream.
	Published:	2021-07-09 03:04 UTC
	Forecaster:	029/026

During last week, solar activity was very low to low. There were four sunspot regions on the visible disk, with 3 C-class flares produced. Due to the effect of the recurrent coronal hole high speed stream, the solar wind speed reached a peak of about 486 km/s on 14-15 Jul and the geomagnetic field was at active levels for 6 hours on 14 Jul. It was quiet to unsettled for the rest of time.
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:	2021-07-16 01:40 UTC
	Forecaster:	010/027

During last week, solar activity was very low to low. There were eight sunspot regions (AR2842-AR2849) on the visible disk with 6 C-class flares produced. The F10.7 index increased from 75 sfu to 94 sfu. The solar wind speed ranged from 370 km/s to 540 km/s. Due to the effect of a coronal hole high speed stream, the geomagnetic field reached active levels for 6 hours on 22 Jul. 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 isolated active levels on 23-24 Jul due to the effects of then CME from 20 Jul, and quiet to unsettled during the other time.
	Published:	2021-07-23 04:07 UTC
	Forecaster:	027/026

During last week, solar activity was very low to low. There were four sunspot regions (AR2846-AR2849) on the visible disk with one C-class flare produced. The F10.7 index decreased from 87 sfu to 76 sfu. Due to the effect of a coronal hole high speed stream, the solar wind speed reached a peak of about 540 km/s and the geomagnetic field was at active levels for 3 hours on 28 Jul. It was quiet to unsettled for the rest of time.
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:	2021-07-30 01:14 UTC
	Forecaster:	012/010

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.