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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, without C-class and above flares produced. The solar wind speed reached a peak of 477 km/s. The geomagnetic field reached active levels for 3 hours, and quiet to unsettled level for the rest 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:	2019-10-10 00:18 UTC
	Forecaster:	029/015

During the past 24 hours, solar activity was very low. There was no active region on the visible disk, without C-class and above flares produced. The solar wind speed increased to about 500 km/s. The geomagnetic field reached active levels for 6 hours, and quiet to unsettled level for the rest 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:	2019-10-11 00:20 UTC
	Forecaster:	015/029

During the past 24 hours, solar activity was very low. There was no active region on the visible disk, without C-class and above flares produced. The solar wind speed maintained at about 450 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 will be mainly quiet on 12-13 Oct and reach isolated active conditions on 14 Oct due to the effect of a coronal hole high speed stream.
	Published:	2019-10-12 00:12 UTC
	Forecaster:	026/021

During the past 24 hours, solar activity was very low. There was no active region on the visible disk, without C-class and above flares produced. The solar wind speed decreased to about 380 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 will be mainly quiet on 13 Oct and reach isolated active conditions on 14-15 Oct due to the effect of a coronal hole high speed stream.
	Published:	2019-10-13 00:15 UTC
	Forecaster:	021/039

During the past 24 hours, solar activity was very low. There was no active region on the visible disk, without C-class and above flares produced. The solar wind speed decreased to about 320 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 will reach isolated active conditions on 14-15 Oct due to the effect of a coronal hole high speed stream, and be mainly quiet on 16 Oct.
	Published:	2019-10-14 00:00 UTC
	Forecaster:	039/010

During the past 24 hours, solar activity was very low without C-class and above flare produced. There was no active region on the visible disk. Due to the effect of a weak coronal hole high speed stream, the solar wind speed reached a peak of about 375 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.
	Published:	2019-10-15 00:04 UTC
	Forecaster:	010/035

During the past 24 hours, solar activity was very low without C-class and above flare produced. There was no active region on the visible disk. The solar wind speed maintained at about 360 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 mainly quiet.
	Published:	2019-10-16 00:23 UTC
	Forecaster:	035/012

WEEKLY REPORTS

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During last week, solar activity was very low. There was no active region on the visible disk, without C class and above flare produced. The F10.7 index ranged from 66 sfu to 67 sfu. Due to the effect of a coronal hole high speed stream, the solar wind sp eed reached a peak of about 600 km/s and the geomagnetic field reached unsettled levels on 27 Aug. The geomagnetic field was quiet for the rest time.
Within the 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 storm levels on 31 Aug - 1 Sep. It will be quiet to unsettled during other periods.
	Published:	2019-08-30 03:36 UTC
	Forecaster:	026

During last week, solar activity was very low. There was one active region(AR2748) on the visible disk, without C class and above flare produced. The F10.7 index ranged from 67 sfu to 69 sfu. Due to the effect of a coronal hole high speed stream, the solar wind speed reached a peak of about 820 km/s and the geomagnetic field reached middle storm levels for 6 hours, minor storm levels for 27 hours and active levels for 27 hours on 31 Aug - 2 Sep. Due to the effect of another coronal hole high speed stream, the geomagnetic field reached active levels for 6 hours on 5 Sep. The geomagentic field was quiet to unsettled for the rest time. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 31 Aug- 1 Sep and 5 Sep, reached middle storm levels on 2-4 Sep.
Within the next week, 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 maintain at minor storm levels.
	Published:	2019-09-06 01:13 UTC
	Forecaster:	035/012

During last week, solar activity was very low. There was no active region on the visible disk, without C-class and above flare produced. The F10.7 index ranged from 68 sfu to 74 sfu. Due to the effect of a coronal hole high speed stream, the solar wind speed reached a peak of about 570 km/s and the geomagnetic field reached active levels for 3 hours on 6 Sep. The solar wind speed reached a peak of about 540 km/s and the geomagnetic field reached active levels for 3 hours on 9 Sep. The geomagentic field was quiet to unsettled during other periods. The greater than 2 MeV electron flux at geosynchronous orbit maintained at minor storm levels during last week.
Within the 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 isolated active levels on 17-18 Sep. It will be quiet to unsettled during other periods.
	Published:	2019-09-13 01:08 UTC
	Forecaster:	035/010

During last week, solar activity was very low. There was no active region on the visible disk, without C-class and above flare produced. The F10.7 index ranged from 66 sfu to 69 sfu. Due to the continuous effect of a coronal hole high speed stream, the solar wind speed reached a peak of about 520 km/s on 13 Sep. Due to the effect of another coronal hole high speed stream, the solar wind speed reached a peak of about 480 km/s on 15 Sep and the geomagnetic field reached active levels for 12 hours on 16-17 Sep. The geomagentic field was quiet to unsettled during other periods. The greater than 2 MeV electron flux at geosynchronous orbit maintained at minor storm levels on 14-15 Sep.
Within the 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 isolated active levels on 23-24 Sep. It will be quiet to unsettled during other periods.
	Published:	2019-09-20 03:52 UTC
	Forecaster:	039

During last week, solar activity was very low. There was no active region on the visible disk, without C-class and above flare produced. The F10.7 index ranged from 66 sfu to 67 sfu. Due to the effect of a weak CME and a coronal hole high speed stream, the solar wind speed reached a peak of about 500 km/s on 24 Sep. The geomagnetic field was active levels for 3 hours on 24 Sep. The geomagentic field was quiet to unsettled during other periods.
Within the 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 storm levels on 27-28 Sep and to be at active levels on 29 Sep. It will be quiet to unsettled during other periods. The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach storm levels between 28 Sep and 3 Oct.
	Published:	2019-09-27 01:59 UTC
	Forecaster:	021/039

During last week, solar activity was very low. There was one active region, AR2749, on the visible disk, without C-class and above flare produced. The F10.7 index ranged from 66 sfu to 69 sfu. Due to the effect of a coronal hole high speed stream, the solar wind speed reached a peak of about 700 km/s on 27 Sep. The geomagnetic field reached minor storm levels for 15 hours and active levels for 27 hours, with quiet to unsettled levels for the rest of time. The greater than 2 MeV electron flux at geosynchronous orbit reached moderate storm levels on 29 Sep and minor storm levels on 28 Sep, 30 Sep - 3 Oct.
Within the next week, solar activity is expected to be very low. The geomagnetic field is expected to mainly be quiet to unsettled. The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach storm levels on 4-5 Oct.
	Published:	2019-10-04 06:11 UTC
	Forecaster:	039

During last week, solar activity was very low. There was no active region on the visible disk, without C-class and above flare produced. The F10.7 index ranged from 67 sfu to 68 sfu. The solar wind speed increased to about 500 km/s on 10 Oct. The geomagnetic field was active levels for 9 hours on 9-10 Oct. The geomagentic field was quiet to unsettled during other periods. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 4 Oct.
Within the 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 levels on 14-15 Oct. It will be quiet to unsettled during other periods.
	Published:	2019-10-11 02:37 UTC
	Forecaster:	015/029

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.