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Koronagraf

Koronagrafbilde av sola.

Koronagraf er et teleskopisk utstyr som lager en kunstig solformørkelse ved å blokkere for solens blendende lys med en liten skive. Med koronagrafene kan astronomene studere solens omegn, noe som gjør det mulig å blant annet følge de store skyene av elektrisk ladede partikler som slynges ut i forbindelse med utbrudd på solen.

Det er vanskelig å konstruere en koronagraf som virker godt ved jordens overflate, fordi det er vanskelig å unngå spredt lys fra atmosfæren. Det kan imidlertid la seg gjøre – det finne én på Mauna Loa, en fjelltopp på Hawaii. Man får imidlertid langt bedre bilder hvis man observerer fra en satellitt utenfor jordens atmosfære.

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Koronagraf
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