19 May 2021
20210518 Week Rotation Today Rotation Week 20210520

NOAA
3 Active Regions

Flare Forecast

Coronal Holes


Today's Coronal Hole Properties
CHIMERA Number
Centroid
[Heliocentric]
Width
[°]
Area
[%]
< B >
[G]
< Φ >
[Mx]
1 W36S09
(549",-120")
W20-W56
(36)
5.7 -0.5 -5.9e20
2 W35S54
(322",-750")
E65-W63
(128)
5.3 -0.8 -1.3e21
3 E15N08
(-243",169")
E32-W15
(47)
2.4 -0.0 -1.7e19
4 E34N53
(-319",772")
E39-E22
(17)
1.3 0.6 2.6e20
5 W37N28
(510",472")
W34-W43
(9)
0.2 -1.9 -6.7e19
6 W39N14
(576",258")
W35-W42
(7)
0.1 -0.9 -1.6e19
7 E36N14
(-543",254")
E39-E33
(6)
0.1 -0.7 -9.0e18
8 W51N07
(734",133")
W48-W54
(6)
0.0 -1.3 -1.5e19
9 E47N06
(-688",125")
E49-E44
(5)
0.0 -0.4 -4.4e18
10 E18N43
(-219",676")
E21-E15
(6)
0.0 -0.5 -5.1e18
11 W04N14
(59",267")
W02-W05
(3)
0.0 1.3 8.8e18

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-May-2021 11:30 UT .