NOAA Logo

NWS Logo

Organizations

Space Weather Prediction Center

National Oceanic and Atmospheric Administration

Wednesday, April 24, 2024 08:48:53

Main menu

NOAA Scales mini

minimize icon
Space Weather Conditions
on NOAA Scales
24-Hour Observed Maximums
R
no data
S
no data
G
no data
Latest Observed
R
no data
S
no data
G
no data
R1-R2 --
R3-R5 --
S1 or greater --
G
no data
R1-R2 --
R3-R5 --
S1 or greater --
G
no data
R1-R2 --
R3-R5 --
S1 or greater --
G
no data
maximize icon
R
no data
S
no data
G
no data
Current Space Weather Conditions
on NOAA Scales
R1 (Minor) Radio Blackout Impacts
close
HF Radio: Weak or minor degradation of HF radio communication on sunlit side, occasional loss of radio contact.
Navigation: Low-frequency navigation signals degraded for brief intervals.
More about the NOAA Space Weather Scales

R3 (Strong) HF Radio Blackout 1:50pm EST from X1.9 Flare

R3 (Strong) HF Radio Blackout 1:50pm EST from X1.9 Flare
published: Thursday, January 12, 2023 15:50 UTC

Spot complex Region 3184 produced an impulsive X1.9 flare (R3-Strong HF Radio Blackout) at 1:50pm EST (1850 UTC) on 9 January, 2023. This region was also the likely source of an X1.2 (R3) flare on 5 January from the southeast solar limb; and since rotating onto the visible solar disk, this region has also been the source of occasional M-class (R1; Minor) solar flares. Impulsive flares that reach the R3 levels can result in short-term HF radio frequency blackouts centered at the subsolar point during flare maximum. Continue visiting our SWPC webpage for the latest information and updates.