21 April 2021
⇐20210420 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20210422⇒

NOAA
4 Active Regions
12816
12817
12818
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 W28S13
(432",-135") 		W09-W43
(34) 		3.6 -1.0 -6.2e20
2 E07S07
(-108",-31") 		E20-W11
(31) 		2.6 -0.1 -5.6e19
3 E21N46
(-240",745") 		E62-W04
(66) 		2.1 0.6 3.6e20
4 W47S67
(276",-851") 		E37-W59
(96) 		1.9 -0.8 -6.9e20
5 W57S42
(592",-603") 		W43-W77
(34) 		0.8 -0.8 -2.0e20
6 E19N68
(-117",912") 		E36-E11
(25) 		0.2 0.8 8.7e19
7 W40S14
(604",-162") 		W38-W43
(5) 		0.1 -0.7 -1.3e19
8 E16N39
(-210",660") 		E18-E15
(3) 		0.0 1.5 1.3e19

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 21-Apr-2021 19:30 UT .