21 May 2017
⇐20170520 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20170522⇒

NOAA
3 Active Regions
12656
12658
12657

Flare Forecast
Flare Prediction System
MM MotD

Coronal Holes


Today's Coronal Hole Properties
CHIMERA Number
Centroid
[Heliocentric]
Width
[°]
Area
[%]
< B >
[G]
< Φ >
[Mx]
1 215
(609",-338") 		1.8e05
(3.2) 		6.1 -7.8 -1.4e34
2 -309
(-129",-880") 		3.3e05
(1.3) 		5.8 -7.5 -2.5e34
3 -135
(99",-539") 		4.4e04
(1.2) 		5.6 -6.9 -3.0e33
4 458
(549",377") 		2.9e04
(0.6) 		5.1 -9.0 -2.6e33
5 -442
(-374",802") 		9.4e04
(0.4) 		6.2 -5.9 -5.6e33
6 -257
(-193",-585") 		1.3e04
(0.3) 		6.2 -11.3 -1.5e33
7 449
(495",150") 		3.9e03
(0.1) 		4.9 -15.5 -6.1e32
8 573
(608",-4") 		4.2e03
(0.1) 		5.2 -9.1 -3.8e32

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 21-May-2017 23:30 UT .