For 10 points, name this thin outermost layer of the sun.
The temperatures of certain loops in these regions are given by an empirically-fit power law in the product of base pressure and length. The magnetic carpet may be one contributor to its temperature. It is distinguished by the presence of forbidden lines such as the 6374-angstrom iron-10 line. This region lies above the transition region, which generates the Lyman continuum that populates the "K" part of this region. Holes in this layer contain outwards-pointing open (*) magnetic field lines; the reconnection of those lines may be responsible for the otherwise-inexplicable heat of this region. Masses of ionized particles ejected from this region are responsible for strong geomagnetic storms. For 10 points, name this thin outermost layer of the sun.
The temperatures of certain loops in these regions are given by an empirically-fit power law in the product of base pressure and length.
corona