Newly Identified Forbidden Transitions within the Ground Configuration of Ions of Very Low Abundance P, Cl, K, and Co
Forbidden lines from transitions within the ground configuration of highly ionized atoms occupy an important role in diagnosing the properties of astrophysical plasmas. In this paper we report the identification of forbidden lines in the 500-1500 Å range from transitions within the ground configuration of highly ionized ions of the very low abundance phosphorus, chlorine, potassium, and cobalt recorded by SOHO SUMER. For the newly identified lines we provide upper level fractional populations multiplied by relevant spontaneous decay rates. Aided by the newly identified lines, the coronal composition of elements with photospheric abundances of 5×10-7-1×10-8 relative to hydrogen could be established.