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- solar activity[remove]11
- sluneční aktivita3
- astrophysics2
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- 3141
- 5511
- 71
- Demografie. Populace1
- Earth rotation1
- Geologie. Meteorologie. Klimatologie1
- astronomie1
- astronomy1
- auroral observations1
- climate changes1
- climate impacts1
- climatology1
- fluctuation of the climate1
- geomagnetic storm1
- hard X-ray spectrometer1
- heliographic lattitude1