17 April 2021
⇐20210416 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20210418⇒

NOAA
3 Active Regions
12814
12815
12816

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 W20S54
(192",-723") 		E70-W40
(110) 		11.1 -1.2 -3.3e21
2 E27S15
(-426",-172") 		E41-E06
(35) 		3.7 -0.6 -3.9e20
3 W21N68
(131",913") 		E31-W57
(88) 		0.6 1.1 4.1e20
4 W30N09
(478",233") 		W28-W33
(5) 		0.1 -1.2 -2.1e19

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 17-Apr-2021 23:30 UT .