Abstract
The corona1 is an ionized gas at T ≃ 106 °K. Its base is at a height h ∼ 104 km above the photosphere, corresponding to ϱ ≃ 1.01 where ϱ = (R⨀ + h)/R⨀. The electron density Ne varies from ∼ 4 R× 108 cm-3 at ϱ = 1.01 to ∼ 2 × 106 cm-3 at ϱ = 2. The corona is heated by dissipation of mechanical energy originating in the convection zone.2
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Seaton, M.J. (1965). The Theory of the Coronal Spectrum. In: De Jager, C. (eds) The Solar Spectrum. Astrophysics and Space Science Library, vol 1. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-3587-3_15
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