NOAA SOLAR DATA | 2026-04-23 12:00:03 UTC
QUIET
MUF 21.5 MHz | S/N S1-2
116
SOLAR FLUX INDEX
FAIR
5
A-INDEX
QUIET
2
K-INDEX
QUIET
C1.1
X-RAY
MINOR FLARE
2,106.2
ELECTRON FLUX
ALERT
0.5
PROTON FLUX
NORMAL
PARTICLE RADIATION
21.5
MHz
MAX USABLE FREQ
HF OPEN
G0
GEOMAG STORM
NONE
R0
RADIO BLACKOUT
NONE
NOAA STORM SCALES
G0
GEOMAG FORECAST
NONE
R0
BLACKOUT FORECAST
NONE
24H FORECAST
HF BAND CONDITIONS
600m
85
DAY
GOOD
77
NIGHT
FAIR
160m
81
DAY
GOOD
75
NIGHT
FAIR
80m
79
DAY
FAIR
73
NIGHT
FAIR
40m
77
DAY
FAIR
72
NIGHT
FAIR
20m
72
DAY
FAIR
67
NIGHT
FAIR
10m
46
DAY
POOR
37
NIGHT
POOR
6m
45
DAY
POOR
36
NIGHT
POOR
7-DAY HISTORY
SOLAR INDICES
PARTICLE FLUX
Data source: NOAA Space Weather Prediction Center • Algorithm by RigReference • Classic view & widget embed codes