NOAA SOLAR DATA | 2026-04-20 09:00:02 UTC
QUIET
MUF 19.1 MHz | S/N S1-2
105
SOLAR FLUX INDEX
FAIR
23
A-INDEX
UNSETTLED
2
K-INDEX
QUIET
B5.6
X-RAY
NOMINAL
235.3
ELECTRON FLUX
ACTIVE
1.1
PROTON FLUX
NORMAL
PARTICLE RADIATION
19.1
MHz
MAX USABLE FREQ
HF OPEN
G2
GEOMAG STORM
MODERATE
R0
RADIO BLACKOUT
NONE
NOAA STORM SCALES
G0
GEOMAG FORECAST
NONE
R0
BLACKOUT FORECAST
NONE
24H FORECAST
HF BAND CONDITIONS
600m
88
DAY
GOOD
77
NIGHT
FAIR
160m
84
DAY
GOOD
74
NIGHT
FAIR
80m
82
DAY
GOOD
73
NIGHT
FAIR
40m
80
DAY
GOOD
72
NIGHT
FAIR
20m
75
DAY
FAIR
67
NIGHT
FAIR
10m
49
DAY
POOR
38
NIGHT
POOR
6m
48
DAY
POOR
37
NIGHT
POOR
7-DAY HISTORY
SOLAR INDICES
PARTICLE FLUX
Data source: NOAA Space Weather Prediction Center • Algorithm by RigReference • Classic view & widget embed codes