Why do dedicated observatories frequently use narrow-band filters instead of broadband filters for detailed solar surface images?

Answer

To isolate specific wavelengths corresponding to particular elements or temperatures

Narrow-band filters allow scientists to isolate light emitted by specific elements, such as Hydrogen-alpha, to study different layers or features of the solar atmosphere.

Why do dedicated observatories frequently use narrow-band filters instead of broadband filters for detailed solar surface images?

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