19 August 2021
⇐20210818 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20210820⇒

NOAA
4 Active Regions
12858
12853
12855
12857

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 W26S05
(417",-177") 		E16-W50
(66) 		6.7 0.0 5.5e18
2 E25N54
(-231",705") 		E88-W09
(97) 		5.1 1.0 1.2e21
3 W23S64
(163",-892") 		E20-W43
(63) 		0.9 -0.7 -3.3e20
4 W28S40
(337",-688") 		W17-W36
(19) 		0.5 -0.4 -5.7e19
5 E07N26
(-103",313") 		E11-E01
(10) 		0.4 1.3 9.2e19
6 W27N17
(412",183") 		W23-W31
(8) 		0.2 -0.8 -2.4e19
7 E15S22
(-222",-457") 		E19-E12
(7) 		0.1 -1.7 -3.6e19
8 E10S25
(-148",-502") 		E12-E07
(5) 		0.1 -1.7 -1.9e19
9 E25S19
(-381",-405") 		E27-E24
(3) 		0.0 -2.4 -1.7e19

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 19-Aug-2021 23:30 UT .