Using Kopp & Orrall (1976) model for the electron density and temperature for the quiet sun and the coronal hole regions, we have computed emission line intensities from Mg VIII, Si X (boron-like); Mg VII, Si IX (Carbon-like) ...

In this article the methods to probe the solar corona are briefly described. The discussion is confined to continuum and the "optical" wavelength region ~ 0.3 mum to 1.1 mum.