Thread: [DXZone] Sunspot Index Since 1750
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Old April 14th 21, 07:53 AM posted to rec.radio.amateur.dx,rec.radio.info
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Default [DXZone] Sunspot Index Since 1750

The DXZone.com Amateur Radio Internet Guide

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Sunspot Index Since 1750

Posted:
https://www.dxzone.com/dx34352/sunsp...ince-1750.html

Propagation/Sunspots
The yearly, black, up to 1750, and monthly red, from 1750 up to now,
sunspot numbers provided by the Royal Observatory of Belgium SILSO

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