20 September 2021
⇐20210919 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20210921⇒

NOAA
2 Active Regions
12871
12870

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 E12S10
(-198",-286") 		E40-W23
(63) 		8.9 -0.8 -1.2e21
2 W40N71
(199",867") 		E69-W69
(138) 		1.6 1.1 7.0e20
3 W30S60
(238",-876") 		W02-W56
(54) 		1.2 -0.8 -4.5e20
4 E45N46
(-468",623") 		E55-E31
(24) 		0.8 0.6 1.4e20
5 E61N60
(-422",792") 		E66-E44
(22) 		0.6 0.6 1.4e20
6 W31S09
(489",-242") 		W28-W33
(5) 		0.1 -1.0 -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 20-Sep-2021 19:30 UT .