Belgium
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Ham Radio : Clubs : Europe : Belgium- Radioclub Grimbergen
- Radioamateurs Grimbergen, sectie NBT, UBA, ON6NB Belgium
[ Hits: 284 | Votes: 1 | Rating: 10 ]
- Sunspot Index and Long-term Solar Observations
- The Solar Influences Data analysis Center SIDC is a department of the Royal Observatory of Belgium and its mission is to preserve, develop and diffuse the knowledge of the long-term variations of solar activity.
[ Hits: 141 | Votes: 0 | Rating: 0 ]
- Sunspot Index Since 1750
- The yearly, black, up to 1750, and monthly red, from 1750 up to now, sunspot numbers provided by the Royal Observatory of Belgium SILSO
[ Hits: 115 | Votes: 0 | Rating: 0 ]
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