22 April 2021
⇐20210421 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20210423⇒

NOAA
3 Active Regions
12816
12817
12818

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 E16N52
(-158",804") 		E59-W16
(75) 		3.7 0.6 6.9e20
2 E17S02
(-280",41") 		E34-W12
(46) 		3.2 0.2 7.9e19
3 W43S13
(639",-149") 		W31-W54
(23) 		1.3 -1.7 -4.6e20
4 W30S80
(81",-925") 		E18-W64
(82) 		0.1 -0.7 -6.8e19
5 E26N09
(-417",219") 		E29-E23
(6) 		0.1 -0.8 -7.9e18
6 E60N56
(-455",816") 		E65-E58
(7) 		0.1 0.9 3.7e19
7 W26N02
(420",106") 		W23-W28
(5) 		0.1 0.7 6.6e18
8 W37N02
(577",107") 		W36-W38
(2) 		0.0 -1.1 -9.5e18
9 W62S46
(591",-652") 		W58-W66
(8) 		0.0 -1.3 -2.4e19
10 W56S74
(215",-903") 		W48-W51
(3) 		0.0 -1.3 -2.9e19

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-Apr-2021 19:30 UT .