18 April 2021
⇐20210417 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20210419⇒

NOAA
3 Active Regions
12814
12816
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 W34S54
(314",-729") 		E57-W50
(107) 		8.9 -1.1 -2.7e21
2 E14S13
(-226",-136") 		E34-W18
(52) 		7.3 -0.5 -5.8e20
3 W28N66
(186",900") 		W14-W52
(38) 		0.4 1.0 2.1e20
4 E47N35
(-570",599") 		E50-E44
(6) 		0.3 -0.4 -4.0e19
5 W25S10
(404",-86") 		W21-W28
(7) 		0.2 1.0 3.7e19
6 W09N45
(111",732") 		W06-W13
(7) 		0.1 0.4 5.7e18
7 E34N06
(-528",166") 		E36-E31
(5) 		0.1 -0.8 -9.0e18
8 W08N04
(127",152") 		W07-W08
(1) 		0.1 -0.9 -7.9e18
9 E52N45
(-535",706") 		E55-E48
(7) 		0.0 -0.8 -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-Apr-2021 23:30 UT .