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1 year ago in Solar Physics By Nitin

What are the advantages of ground-based versus satellite studies of solar eclipses?

We're drafting a proposal for a ground-based eclipse expedition. The review panel will inevitably ask why we don't just use data from space-based coronagraphs like those on SOHO or SDO, which create artificial eclipses daily. What are the compelling, unique scientific arguments for the expense and logistical difficulty of a ground campaign that satellites cannot replicate?

 

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By Krirthi Answered 9 months ago

Satellites provide unparalleled continuous monitoring, but ground-based eclipse observations offer two irreplaceable advantages. First is proximity to the limb: space coronagraphs have an occulting disk that blocks the innermost corona (the first ~1.2 solar radii), which is precisely where critical magnetic structures and the acceleration region of the solar wind exist. During totality, we see this region in pristine detail. Second is instrumental flexibility and resolution: we can deploy a new, cutting-edge spectrograph or a ultra-high-speed camera for just those few minutes, achieving a spatial and temporal resolution that is often not possible with a permanently orbiting, general-purpose satellite instrument.

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