18 May 2021
⇐20210517 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20210519⇒

NOAA
2 Active Regions
12822
12823

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 W33S44
(368",-642") 		E52-W47
(99) 		14.1 -0.8 -2.8e21
2 E41N50
(-396",748") 		E50-E35
(15) 		0.8 0.3 8.8e19
3 W29N27
(403",463") 		W24-W35
(11) 		0.5 -1.1 -1.1e20
4 E23N08
(-366",170") 		E24-E21
(3) 		0.1 -2.1 -1.8e19

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-May-2021 19:30 UT .