13 August 2021
⇐20210812 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20210814⇒

NOAA
4 Active Regions
12855
12852
12853
12854

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 W35N67
(213",831") 		E87-W66
(153) 		3.7 1.1 1.4e21
2 E46S11
(-666",-260") 		E54-E37
(17) 		0.4 -0.4 -3.3e19
3 W33S61
(252",-865") 		W36-W39
(3) 		0.3 -1.0 -1.4e20
4 W22S02
(351",-136") 		W20-W23
(3) 		0.1 -1.1 -9.5e18
5 E29N27
(-411",340") 		E31-E27
(4) 		0.0 -2.9 -2.2e19

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 13-Aug-2021 23:30 UT .