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  The Chehalis Valley
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Solar-Terrestrial Data banner

    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
  14. VHF Conditions
  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    │     Facebook Link