21 August 2021
⇐20210820 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20210822⇒

NOAA
3 Active Regions
12858
12855
12857

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 W00N57
(3",730") 		E78-W35
(113) 		6.2 0.8 1.2e21
2 E24S28
(-337",-537") 		E29-E17
(12) 		0.4 -2.1 -1.6e20
3 W23N24
(333",292") 		W19-W26
(7) 		0.1 1.6 3.5e19
4 W18S11
(283",-294") 		W16-W19
(3) 		0.1 -2.2 -3.0e19
5 W13S25
(187",-495") 		W10-W15
(5) 		0.0 0.7 6.8e18
6 W24S08
(376",-234") 		W22-W26
(4) 		0.0 -1.2 -7.3e18

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 21-Aug-2021 23:30 UT .