30 April 2017
⇐20170429 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20170501⇒

NOAA
4 Active Regions
12651
12653
12654
12652

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 E13N11
(-206",253") 		E26-W12
(38) 		5.5 -0.0 -4.6e31
2 E26S66
(-170",-841") 		E77-W60
(137) 		3.9 -1.0 -6.3e33
3 W33N62
(241",867") 		E24-W59
(83) 		1.3 0.4 1.3e33
4 W53S46
(526",-659") 		W50-W58
(8) 		0.0 -0.9 -4.4e31

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 30-Apr-2017 19:30 UT .