18 September 2021
⇐20210917 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20210919⇒

NOAA
3 Active Regions
12866
12869
12870

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 E33N04
(-525",-27") 		E50-E11
(39) 		3.6 -0.2 -1.4e20
2 W23N72
(114",867") 		E93-W92
(185) 		2.3 1.1 9.4e20
3 W11S64
(80",-901") 		E23-W48
(71) 		1.0 -0.5 -2.5e20
4 E19S24
(-284",-495") 		E25-E12
(13) 		0.8 -4.0 -6.0e20
5 W32S23
(474",-457") 		W24-W38
(14) 		0.6 -0.7 -9.9e19
6 W16S29
(228",-560") 		W06-W26
(20) 		0.4 -0.6 -5.0e19
7 W11N31
(151",396") 		W07-W15
(8) 		0.4 1.9 1.2e20
8 E21S12
(-336",-314") 		E24-E17
(7) 		0.1 -1.5 -2.7e19
9 E46S09
(-681",-235") 		E48-E43
(5) 		0.0 1.0 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 18-Sep-2021 23:30 UT .