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    Value Significance

A  Index	K  Index	Condition
0 -  7	0-2	Quiet
8 - 15	3	Unsettled
16 - 29	4	Active
30 - 49	5	Minor Storm
50 - 99	6	Major Storm
>100	7-9	Severe Storm

SFI	A  Index	K  Index	Propagation   Opening
>180	< 8	< 3	E-W Open
>180	< 8	> 3	N-S Open
>250	>30	> 3	Aurora

Glossary of Banner Terms

1. SFI - Solar Flux Index (62.5 < value < 300; updated 3 times per day)
2. SN - Sunspot Number (0 < value < 250; updated daily)
3. A - Planetary A Index (0 < vallue < 400; updated daily)
4. K - Planetary K Index (0 < value < 9; updated 8 times per day)
5. X-Ray - Hard X-Rays (order of magnitude: A<B<C<M<X; 0.0 < value < 9.9; updated 8 times per day)
6. 304A - Relative strength of total solar radiation at wavelength of 304 Angstroms (0 < value < unknown; updated hourly)
7. Ptn Flx - Proton Flux (0 < value < unknown; updated hourly)
8. Elc Flx - Electron Flux (0 < value < unknown; updated hourly)
9. Aurora - F-layer ionization in polar regions (0 < value < 10++; updated every 15 minutes)
10. n - Always 1.99, being removed in next banner update
11. Bz - Bz Component (-50 < value < +50; updated hourly)
12. SW - Solar Wind (0 < value < 1000; updated hourly)
13. HF Conditions
    • Day and Night Conditions (value Poor, Fair, or Good)
14. VHF Conditions
    • Aur Lat - Aurora Latitude (<45 < value < 67.5; updated every 15 minutes)
    • Aurora (value Band Closed, High LAT AUR, or MID LAT AUR; updated every 30 minutes)
    • 6m/4m/2m - (value EsEU [Sporadic E Europe] or EsNA [Sporadic E North America])
      EsEU subvalues (value Band Closed, High MUF when only 2M open, 50/70/144MHz ES when respective band is open; updated every 30 minutes)
      EsNA subvalues (value Band Closed, High MUF, 144MHz ES; updated every 30 minutes)
    • EME Deg - Earth-Moon-Earth Degradation - EME path attenuation (value Very Poor [>5.5dB], Poor [4dB], Moderate [2.5dB], Good [1.5dB], Very Good [1dB], Excellent [<1dB]; updated every 30 minutes)
    • Solar Flare Prb - Solar Flare Probability (0% < value < 100%; updated every hour)
    • MUF - Maximum Usable Frequency bar (value Gray=No Sporadic E, Blue=ES reported @6M, Green=ES reported @4M, Yellow=conditions support 2M ES, Red=ES reported @2M; updated every 30 minutes)
    • MS - Meteor Scatter Activity bar (value Gray=no activity, scale shows minimum to maximum color code; updated every 15 minutes)
15. Geomag Field - Geomagnetic Field (value Inactive, Very Quiet, Quiet, Unsettled, Active, Minor Storm, Major Storm, Severe Storm, Extreme Storm; updated every 3 hours)
16. Sig Noise Lvl - Signal Noise Level (value in S-units; updated every 30 minutes)
17. MUF US Boulder - Maximum Usable Frequency at Boulder, Colorado (0 < value < 100 MHz; updated every 15 minutes)

Addition information:

1. https://spaceweather.com/
2. https://www.swpc.noaa.gov/NOAAscales/
3. https://www.hamqsl.com/FAQ.html#Solar - Scroll down to "Where can I find information on the data provided in the banner?"
4. https://www.hamqsl.com/solar2.html#glossary - Glossary of terms in the solar banner

  Updated 11/13/2021   │     Email webmaster    │