Merkurs atmosfære

Merkurs atmosfære er en svært tynn og veldig variabel (overflatebunden eksosfære). Atmosfæren inneholder hydrogen, helium, oksygen natrium, kalsium, kalium og vanndamp, med et samlet trykknivå på ca. 10-14 bar (1 nPa).[1] De eksosfæriske stoffene kommer enten fra solvinden eller fra planetskorpen. Sollyset dytter de atmosfæriske gassene bort fra solen, og danner en kometlignende hale bak planeten.

Eksistensen av en atmosfære på Merkur var omstridt før 1974, selv om det på den tiden hadde blitt et konsensus om at Merkur, som månen, ikke hadde noen atmosfære av betydning. Denne konklusjonen ble bekreftet i 1974, da Mariner 10-sonden bare oppdaget en tynn eksosfære. Senere, i 2008, førte forbedrede målinger fra Messenger-sonden til oppdagelsen av magnesium i eksosfæren.

Referanser

  1. ^ «NASA—Mercury». Arkivert fra originalen 6. oktober 2009. Besøkt 4. juni 2013.  «Arkivert kopi». Arkivert fra originalen 23. april 2007. Besøkt 4. juni 2013. 
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