20 April 2021
⇐20210419 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20210421⇒

NOAA
4 Active Regions
12816
12817
12814
12815

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 W02S13
(34",-129") 		E30-W29
(59) 		6.7 -0.6 -6.1e20
2 W48S55
(402",-752") 		E63-W68
(131) 		5.9 -0.9 -1.8e21
3 E30N46
(-334",733") 		E50-E24
(26) 		1.4 0.5 2.1e20
4 E12N14
(-198",312") 		E14-E10
(4) 		0.1 -0.9 -9.5e18
5 W39S02
(603",33") 		W37-W41
(4) 		0.0 -1.0 -8.8e18
6 E02N30
(-28",553") 		5
(8.3e02) 		-2.3 2.8 2.3e19

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 20-Apr-2021 11:30 UT .