Eclipse Observations of the Fe XI 789.2 nm Line

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

The first image of the corona in Fe XI 789.2 nm was taken during the total solar eclipse of 29 March 2006. It revealed a number of surprises, primarily an emission extending out to at least 3 Rs and localized regions of enhanced Fe^10+ ion density relative to electrons. Subsequent observations of this spectral line were successfully made during the eclipses of 2008 and 2009. These Fe XI observations will be presented, together with simultaneous eclipse observations of the more widely observed Fe X 637.4, Fe XIII 1074.7 and Fe XIV 530.3 nm lines. Particular emphasis will be placed on the new insights gained by this suite of measurements into the thermodynamic properties of the inner corona.

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