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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. There was no active region on the visible disk, and no C-class and above flares produced. The solar wind speed maintained at about 300 km/s. The geomagnetic field was quiet. The greater than 2 MeV electron flux at geosynchronous orbit maintained at 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 on 18 Apr and reach active levels on 19-20 Apr due to a recurrent coronal hole high speed stream. The greater than 2 MeV electron flux at geosynchronous orbit is expected to maintain at minor storm levels on 18 Apr.
	Published:	2018-04-18 00:00 UTC
	Forecaster:	039/021

During the past 24 hours, solar activity was very low. There was no active region on the visible disk, and no C-class and above flares produced. The solar wind speed maintained at about 300km/s. The geomagnetic field was quiet. The greater than 2 MeV electron flux at geosynchronous orbit maintained at minor storm levels.
Within the next three days, solar activity is expected to be very low. Due to a recurrent coronal hole high speed stream, the geomagnetic field is expected to reach active levels on 19-20 Apr, and to be quiet on 21 Apr. The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach minor storm levels on 21 Apr.
	Published:	2018-04-19 00:09 UTC
	Forecaster:	021/035

During the past 24 hours, solar activity was very low. There was one active region on the visible disk, and no C-class and above flares produced. The solar wind speed decreased to about 280km/s. The geomagnetic field was quiet.
Within the next three days, solar activity is expected to be very low. Due to a recurrent coronal hole high speed stream, the geomagnetic field is expected to reach active levels on 20-21 Apr, and to be quiet to unsettled on 22 Apr.
	Published:	2018-04-20 00:01 UTC
	Forecaster:	035/012

During the past 24 hours, solar activity was very low. There was one active region on the visible disk, and no C-class and above flares produced. Due to the recurrent coronal hole high speed stream, the solar wind speed increased to about 630 km/s. The geomagnetic field reached moderate storm levels for 6 hours and minor storm levels for 6 hours.
Within the next three days, solar activity is expected to be very low. Due to the continuous effect of the recurrent coronal hole high speed stream, the geomagnetic field is expected to reach isolated minor storm levels on 21 Apr, and to be quiet to unsettled on 22-23 Apr. The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach storm levels on 21-23 Apr.
	Published:	2018-04-20 23:54 UTC
	Forecaster:	012/032

During the past 24 hours, the solar activity was very low. There were two active regions on the visible disk, with no C-class and above flare produced. The solar wind speed slowly decreased to about 545 km/s. The geomagnetic field was at quiet to unsettled levels. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels.
Within the next three days, the solar activity is expected to be very low to low. The geomagnetic field is expected to be quiet to unsettled. The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach moderate storm levels.
	Published:	2018-04-22 00:06 UTC
	Forecaster:	029/026

During the past 24 hours, solar activity was very low. There was one active region on the visible disk, with no C-class and above flares produced. The solar wind speed slowly decreased to about 430 km/s. The geomagnetic field was at quiet levels. 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 to low. The geomagnetic field is expected to be quiet to unsettled. The greater than 2 MeV electron flux at geosynchronous orbit is expected to maintain at minor storm levels.
	Published:	2018-04-23 00:18 UTC
	Forecaster:	026/035

During the past 24 hours, solar activity was very low. There was one active region on the visible disk, with no C-class and above flares produced. The solar wind speed slowly decreased to about 390 km/s. The geomagnetic field was at quiet to unsettled levels. 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 to low. The geomagnetic field is expected to be quiet to unsettled. The greater than 2 MeV electron flux at geosynchronous orbit is expected to maintain at minor storm levels.
	Published:	2018-04-24 00:13 UTC
	Forecaster:	029/010

WEEKLY REPORTS

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During last week, solar activity was very low. One active region 2700 was on the visible disk and produced only one C1.9 flare. There was no M-class flare and above flare produced. The F10.7 index maintained at 68 sfu. Due to the effect of a coronal hole high speed stream, the solar wind speed reached a peak of 460 km/s on 4 Mar. The geomagnetic field was at quiet to unsettled levels.
Within the next week, solar activity is expected to be very low. Due to a coronal hole high speed stream, the geomagnetic field is expected to reach active or minor storm levels on 14-15 Mar. It is expected to be quiet to unsettled on other periods.
	Published:	2018-03-09 04:21 UTC
	Forecaster:	010

During last week, solar activity was very low. One active region 2701 was on the visible disk. There was no C-class flare and above flare produced. The F10.7 index maintained at 68 sfu. Due to the effect of CME on 5 Mar, the solar wind speed reached a peak of 460 km/s on 9-10 Mar, and the geomagnetic field was at active levels for 9 hours. Due to the effect of a coronal hole high speed stream, the solar wind speed increased from 320km/s to about 530 km/s on 14-15 Mar, and the geomagnetic field was at active levels for 12 hours.
Within the next week, solar activity is expected to be very low. Due to the effect of recurrent coronal high speed stream, the geomagnetic field is expected to reach active on 16-18 Mar. It is expected to be quiet to unsettled on other periods.
	Published:	2018-03-16 01:10 UTC
	Forecaster:	015

During last week, solar activity was very low. One active region 2702 was on the visible disk. There was no C-class flare and above flare produced. The F10.7 index maintained at 69-70 sfu. Due to the effect of a coronal hole high speed stream, the solar wind speed reached a peak of 610 km/s on 19 Mar, and the geomagnetic field was at minor storm levels for 9 hours, active levels for 18 hours on 16-19 Mar. Due to the effect of another coronal hole high speed stream, the solar wind speed increased from 320km/s to about 420 km/s on 22 Mar. The greater than 2 MeV electron flux at geosynchronous orbit was at minor storm levels on 16-22 Mar.
Within the next week, solar activity is expected to be very low. Due to the effect of a recurrent coronal high speed stream, the geomagnetic field is expected to reach active or minor storm levels on 23-26 Mar. It is expected to be quiet to unsettled on other periods.
	Published:	2018-03-23 00:56 UTC
	Forecaster:	039

During last week, solar activity was very low. There was no active region on the visible disk, and no C-class flare and above flare produced. The F10.7 index maintained at 68-69 sfu. Due to the effect of a coronal hole high speed stream, the solar wind speed reached a peak of 510 km/s during 23-25 Mar, and the geomagnetic field was at active levels for 18 hours. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 25-26 Mar, moderate storm levels on 27-29 Mar.
Within the next week, solar activity is expected to be very low. Due to the effect of a coronal high speed stream, the geomagnetic field is expected to reach isolated active levels on 30 Mar. It is expected to be quiet to unsettled on other periods. The greater than 2 MeV electron flux at geosynchronous orbit is expected to maintain at minor storm levels for 1-2 days.
	Published:	2018-03-30 02:28 UTC
	Forecaster:	032/035

During last week, solar activity was mainly very low, with reaching low level on 30 Mar. There was one active region 2703 on the visible disk, which produced one C-class flare. The F10.7 index decreased from 69 sfu to 66 sfu. The solar wind speed was at 320-480 km/s. The geomagnetic field was mainly quiet and reached isolated unsettled levels. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 30 Mar - 2 Apr.
Within the next week, solar activity is expected to be very low. Due to the effect of a coronal high speed stream, the geomagnetic field is expected to reach isolated minor storm levels on 10-12 Apr. It is expected to be quiet to unsettled on other periods. The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach minor storm levels on 12 Apr.
	Published:	2018-04-06 04:09 UTC
	Forecaster:	026/032

During last week, solar activity was very low. There was one active region 2704 on the visible disk, and no C-class and above flare produced. The F10.7 index increased from 67 sfu to 70 sfu. Due to the effect of the recurrent coronal hole high speed stream, the solar wind speed reached a peak of 610 km/s on 11 Apr. The geomagnetic field was at minor storm levels for 3 hours and active levels for 15 hours on 9-11 Apr. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 11-12 Apr.
Within the next week, solar activity is expected to be very low. Due to the continuous effect of the recurrent coronal high speed stream, the geomagnetic field is expected to reach isolated active levels on 13-14 Apr. It is expected to be quiet to unsettled on other periods. The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach minor storm levels on 13-17 Apr.
	Published:	2018-04-13 00:58 UTC
	Forecaster:	039/012

During last week, solar activity was very low. There were two active regions 2704 and 2706 on the visible disk, and no C-class and above flare produced. The F10.7 index maintained at about 70 sfu. Due to the continuous effect of the recurrent coronal hole high speed stream, the geomagnetic field was at active levels for 3 hours. It was at quiet levels on the rest time. The solar wind speed decreased from 490 km/s to 280km/s. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 13-18 Apr.
Within the next week, solar activity is expected to be very low. Due to the effect of the recurrent coronal high speed stream, the geomagnetic field is expected to reach isolated minor storm levels on 20-21 Apr. It is expected to be quiet to unsettled on other periods. The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach minor storm levels on 22-26 Apr.
	Published:	2018-04-20 01:53 UTC
	Forecaster:	035/012

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.