28 April 2021
⇐20210427 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20210429⇒

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 E21N01
(-348",89") 		E49-W27
(76) 		16.7 0.3 6.8e20
2 W05N66
(36",898") 		E58-W64
(122) 		1.3 0.6 3.7e20
3 W08S24
(127",-314") 		E03-W15
(18) 		0.6 1.0 9.1e19
4 W38S78
(127",-916") 		W06-W71
(65) 		0.2 -1.1 -1.7e20
5 W33N16
(504",326") 		W31-W37
(6) 		0.1 -1.1 -2.9e19
6 W25N10
(402",223") 		W23-W28
(5) 		0.1 -0.9 -1.6e19

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 28-Apr-2021 11:30 UT .