and Solar Weather
Solar-Terrestrial Data On Left
SOHO Image of Sun
Current Solar Images
Solar Monitor.org
SFI -- Solar Flux Index Radio Emissions at 2.8 GHz
Less than 100: Weak solar activity
Poor HF Band Reception
100 to 150: Moderate solar activity
Fair to Average HF Band Reception
150 to 200: High solar activity
Good HF Band Reception
SN -- Sunspot Number
Less than 50: Low solar activity
50 to 100: Moderate solar activity
Over 100: High solar activity
A -- Ap Index - Geomagnetic Activity Over 24 Hours
caused by solar storms.
Less than 10: Quiet
10 to 30: Active
30 to 50: Geomagnetic Storm
More than 50: Severe Geomagnetic Storm
K -- Kp Index - Instantaneous (3hr avg) Geomagnetic
Activity caused by solar storms
0-1 Very Quite
2-3 Quiet
4-5 Unsettled
6-7 Active
8-9 Major Storm
X-Ray -- Types of X-ray emissions from the Sun
indicated by a letter and a number which
indicates strength.
A Small and weakest, minimal impact
B Moderate
C Intermediate strength, minor HF disruptions
M Stronger with perhaps bright auroras
X Powerful and intense. Can cause significant
disruptions in radio, satellite, and power grids.
304A -- Total solar radiation in UV range.
80 Poor
150 Good
240 Fabulous
Ptn Flx -- Proton Flux in Solar Wind
0.10 Good
2.0 Moderate
20.0 Heavy
Elc Flx -- Electron Flux in Solar Wind
Less than 1000 little impact
More than 1000 heavy impact
Aurora -- Aurora Possibility
0 to 10
with <2 low confidence, >2 high confidence
Bz (B sub z) Interplanetary magnetic field vector
perpendicular to Earth orbit
SW -- Solar Wind average speed
>500 impacting HF, range 0 to 1000
MUF -- Maximum Usable Frequency in MHz
6m blue, 4m green, 2m EU yellow, 2m NA red,
gray = no activity.
updated every 30 min
MS -- Meteor Scatter, indicated by Min-Max color scale
below it. Gray is no activity.
Updated every 15 min
Signal Noise Level --- logarithmic measurement in 6db
increments of then noise generated by solar wind,
compared with noise floor.
(Source Brass Tacks and AI ChatGPT)
