25 April 2021
⇐20210424 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20210426⇒

NOAA
4 Active Regions
12816
12818
12819
12820

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 E17N13
(-275",294") 		E59-W40
(99) 		13.9 0.1 3.0e20
2 W28N55
(257",816") 		96
(1.3e05) 		0.6 3.4 4.4e21
3 E25S74
(-110",-896") 		E78-W54
(132) 		0.8 -1.2 -4.4e20

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 25-Apr-2021 19:30 UT .