18 August 2021
⇐20210817 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20210819⇒

NOAA
3 Active Regions
12857
12853
12855

Flare Forecast
Flare Prediction System
MM MotD

Coronal Holes


Today's Coronal Hole Properties
CHIMERA Number
Centroid
[Heliocentric]
Width
[°]
Area
[%]
< B >
[G]
< Φ >
[Mx]
1 W09S07
(151",-220") 		E32-W32
(64) 		7.2 0.0 2.4e19
2 E36N52
(-343",685") 		E40-E73
(-33) 		3.6 1.1 1.1e21
3 E05S62
(-41",-887") 		E26-W29
(55) 		1.0 -0.4 -1.9e20
4 W25N26
(357",321") 		W19-W29
(10) 		0.3 -1.6 -7.7e19
5 W01N26
(22",306") 		E03-W05
(8) 		0.2 -2.0 -5.0e19
6 W21S56
(187",-840") 		W19-W22
(3) 		0.0 -1.5 -2.6e19
7 W39N02
(596",-52") 		W37-W41
(4) 		0.0 -1.2 -8.9e18

Note: Solar Monitor's coronal hole segmentations are performed by CHIMERA, a copy of which is available at: github.com/TCDSolar/CHIMERA.

The operations of the CHIMERA algorithm is described in a peer reviewed paper: arxiv.org/abs/1711.11476.

An extensive copy of coronal hole properties are available at: solarmonitor.org/data.

The latest positions of the coronal holes are given in heliocentric co-ordinates, and the region positions are valid on 18-Aug-2021 19:30 UT .