sun spot

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NOAA Predicted Sunspot Number - NOAA
Predicted Solar Cycle Sunspot Number And Radio Flux Values with Expected Ranges sources are Penticton ...

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Solar Cycle Progression - NOAA
A dynamic graph of current and past solar cycle sunspot number progression and F10 7 ...

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Sunspot Index and Long-term Solar Observations - SIDC
The Solar Influences Data analysis Center SIDC is a department of the Royal Observatory of ...

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Sunspot Index Since 1750 - ROB
The yearly black up to 1750 and monthly red from 1750 up to now sunspot ...

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Daily Sunspots groups - Catania Solar Observatory
All daily drawings of the sunspot groups and USSPS produced by INAF Catania Astrophysical Observatory ...

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Estimated International Sunspot Number - sidc
The estimated international sunspot number EISN is a daily value obtained by a simple average ...

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RF-Quiet Solar PV for Ham Radio - KA7OEI
This article discusses the potential for solar power systems to coexist harmoniously with amateur radio ...

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