NOAA/SWPC ASCII Solar Disk
Issued: 2026 Apr 16 0030 UTC



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Active Regions

AR 4415  loc=S18W19 area=90   extent=3   zurich=HSX spots=3   mag=A  
AR 4416  loc=N20W50 area=110  extent=7   zurich=DSO spots=7   mag=B  
AR 4419  loc=N13E43 area=260  extent=11  zurich=EKI spots=17  mag=BG   flare_risk=ELEVATED

Flare watch

AR 4419  risk=ELEVATED  loc=N13E43 zurich=EKI mag=BG

Legend:
  North = up, West = right, East = left
  Numbers are NOAA active region IDs
  !NNNN  = elevated flare-risk region (beta-gamma)
  !!NNNN = high flare-risk region (beta-delta)
  !!!NNNN= very high flare-risk region (beta-gamma-delta)

Region fields:
  area   = sunspot area (millionths of solar hemisphere)
  extent = longitudinal extent (degrees)
  zurich = Zurich/McIntosh sunspot classification
  spots  = number of individual sunspots
  mag    = magnetic classification (Mount Wilson)

Zurich class (1st letter):
  A = single small spot/group without penumbra
  B = bipolar group without penumbra
  C = bipolar group; one main spot has penumbra
  D = bipolar group with penumbra on both main spots, length < 10 deg
  E = bipolar group with penumbra on both main spots, length 10-15 deg
  F = large bipolar group with penumbra on both main spots, length > 15 deg
  H = single sunspot with penumbra

Penumbra class (2nd letter):
  X = no penumbra
  R = rudimentary penumbra
  S = small symmetric penumbra
  A = small asymmetric penumbra
  H = large symmetric penumbra
  K = large asymmetric penumbra

Compactness class (3rd letter):
  X = unipolar / not applicable
  O = open
  I = intermediate
  C = compact

Magnetic classification:
  A   = alpha
  B   = beta
  BG  = beta-gamma
  BD  = beta-delta
  BGD = beta-gamma-delta

Flare watch:
  ELEVATED  = beta-gamma
  HIGH      = beta-delta
  VERY HIGH = beta-gamma-delta
  This is a simple magnetic-complexity flag, not a NOAA flare forecast.

Source: NOAA SWPC solar-regions.txt