22 August 2021
⇐20210821 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20210823⇒

NOAA
3 Active Regions
12858
12859
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 W12N59
(102",747") 		E87-W42
(129) 		5.8 0.9 1.3e21
2 E11S28
(-154",-544") 		E15-E01
(14) 		0.5 -3.4 -3.4e20
3 W16S22
(246",-462") 		W13-W20
(7) 		0.1 -3.9 -5.1e19
4 W15S16
(236",-364") 		W13-W16
(3) 		0.0 -4.2 -3.0e19

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 22-Aug-2021 23:30 UT .