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- solar activity2
- Forbush decrease effects1
- Ondřejov Observatory1
- active regions1
- astronomical observations1
- astrophysics1
- auroral observations1
- coronographs1
- cosmic and subcosmic rays1
- fluctuation of the climate1
- heliophysics1
- long-lasting X-ray emission1
- solar X-emission1
- solar flares1
- solar physics1
- source flares1
- space model of cloud1