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hf:solar-terrestrial-data [2025/04/04 20:05] – created m0ltehf:solar-terrestrial-data [2025/06/18 07:26] (current) – [Geophysical Environment] m0lte
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 ====== Solar Terrestrial Data ====== ====== Solar Terrestrial Data ======
  
-From time to time you might come across an image like this, like those published at [http://www.n0nbh.com|n0nbh.com].+From time to time you might come across an image like this, like those published at [[http://www.n0nbh.com|n0nbh.com]].
  
-{{:hf:solar101vhf.png|}} 
  
-This is solar-terrestrial data. Solar-terrestrial charts are used to evaluate radio propagation conditions.+[[https://www.hamqsl.com/solar.html|{{https://www.hamqsl.com/solar101vhf.php?muf=athns&.gif?|Click to add Solar-Terrestrial Data to your website!}}]] 
 + 
 + 
 +The above is LIVE solar-terrestrial data. Solar-terrestrial charts are used to evaluate radio propagation conditions. 
 + 
 +**TL;DR** [[hf:solar-terrestrial-data#quick_interpretation_tips|Quick Interpretation Tips]] 
 + 
 +Here is a bit longer guide on how to interpret them. 
 + 
 +  
  
-Here is a bit of a guide on how to interpret them. 
  
 ===== Date and Time ===== ===== Date and Time =====
  
-**Example:** '''04 Apr 2025 1800 GMT'''+**Example:** ''04 Apr 2025 1800 GMT''
  
 This is the timestamp of the data in UTC (GMT). Data is typically refreshed every few hours. This is the timestamp of the data in UTC (GMT). Data is typically refreshed every few hours.
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 These affect the ionosphere, which in turn impacts radio wave propagation. These affect the ionosphere, which in turn impacts radio wave propagation.
  
-^ Label ^ Meaning ^ Notes ^+^ Label ^ Example ^ Notes ^
 | **SFI** (Solar Flux Index) | 178 | Higher SFI (100–200+) means better HF propagation | | **SFI** (Solar Flux Index) | 178 | Higher SFI (100–200+) means better HF propagation |
 | **SN** (Sunspot Number) | 124 | More sunspots = more ionization = improved HF conditions. 100-250 is the approximate range during solar maximum - see below for more info. | | **SN** (Sunspot Number) | 124 | More sunspots = more ionization = improved HF conditions. 100-250 is the approximate range during solar maximum - see below for more info. |
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 | 12m–10m | Fair | Poor | | 12m–10m | Fair | Poor |
  
-* '''Fair''': Usable but not ideal +  * ''Fair'': Usable but not ideal 
-* '''Poor''': Weak or unreliable propagation+  * ''Poor'': Weak or unreliable propagation
  
 ===== Geophysical Environment ===== ===== Geophysical Environment =====
  
-^ Item ^ Meaning ^+^ Item ^ Example + Meaning ^
 | **Geomag Field** | MIN STORM — mild geomagnetic disturbance ongoing | | **Geomag Field** | MIN STORM — mild geomagnetic disturbance ongoing |
 | **Sig Noise Level** | S4–S6 — background band noise (S1 = low, S9+ = high) | | **Sig Noise Level** | S4–S6 — background band noise (S1 = low, S9+ = high) |
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 Visual indicator of Maximum Usable Frequency (MUF) across regions. Visual indicator of Maximum Usable Frequency (MUF) across regions.
  
-* Blue: <6 MHz — poor +  * Blue: <6 MHz — poor 
-* Yellow/Orange: 8–16 MHz — moderate +  * Yellow/Orange: 8–16 MHz — moderate 
-* Red: >18 MHz — good+  * Red: >18 MHz — good
  
 ===== Quick Interpretation Tips ===== ===== Quick Interpretation Tips =====
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 ---- ----
  
-''Adapted from data provided by [http://www.n0nbh.com|n0nbh.com].''+''Adapted from data provided by [[http://www.n0nbh.com|n0nbh.com]].''
  
  
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 ==== What Is a "Good" SN for Radio Operators? ==== ==== What Is a "Good" SN for Radio Operators? ====
  
-  * '''SN > 50''' → HF band openings become more consistent. +  * ''SN > 50'' → HF band openings become more consistent. 
-  * '''SN > 100''' → Excellent upper HF band propagation (15m, 12m, 10m). +  * ''SN > 100'' → Excellent upper HF band propagation (15m, 12m, 10m). 
-  * '''SN < 30''' → Poor or unreliable conditions on high HF bands.+  * ''SN < 30'' → Poor or unreliable conditions on high HF bands.
  
 ---- ----
  
-''SN values are monitored by observatories like NOAA and SIDC. Regular updates available at [https://www.swpc.noaa.gov/|NOAA Space Weather Prediction Center].''+SN values are monitored by observatories like NOAA and SIDC. Regular updates available at [[https://www.swpc.noaa.gov/|NOAA Space Weather Prediction Center]].
  
hf/solar-terrestrial-data.1743797103.txt.gz · Last modified: by m0lte