4 September 2021
⇐20210903 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20210905⇒

NOAA
3 Active Regions
12863
12864
12861

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 W03N64
(25",793") 		E87-W40
(127) 		5.4 0.7 1.1e21
2 E33S02
(-523",-135") 		E50-E19
(31) 		1.9 -0.1 -4.1e19
3 E25S40
(-303",-696") 		E45-E06
(39) 		1.5 -1.5 -5.7e20
4 W32S21
(478",-435") 		W25-W38
(13) 		0.6 -1.8 -2.1e20
5 E26S65
(-175",-901") 		E53-E15
(38) 		0.3 -0.7 -1.3e20
6 W42S04
(633",-151") 		W36-W47
(11) 		0.3 -1.5 -8.6e19
7 W40S12
(606",-287") 		W37-W44
(7) 		0.2 -1.1 -5.4e19
8 W12S12
(198",-312") 		W10-W15
(5) 		0.1 -1.2 -3.0e19
9 W22S02
(363",-139") 		W21-W24
(3) 		0.0 -1.3 -9.6e18

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 4-Sep-2021 23:30 UT .