29 April 2021
⇐20210428 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20210430⇒

NOAA
4 Active Regions
12818
12820
12821
12819

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 W04S04
(71",-1") 		E38-W40
(78) 		17.7 0.3 8.9e20
2 W20N67
(123",903") 		E47-W64
(111) 		0.9 0.8 3.6e20
3 W23S24
(340",-322") 		W14-W30
(16) 		0.5 1.3 1.1e20
4 E28N58
(-241",837") 		E34-E23
(11) 		0.1 0.8 3.2e19
5 E08N28
(-111",508") 		E11-E05
(6) 		0.1 -1.2 -1.6e19
6 W03S12
(48",-133") 		W01-W05
(4) 		0.0 -1.5 -1.1e19

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 29-Apr-2021 19:30 UT .