REFERENCES PERTAINING TO SOLAR CORONAL LOOPS:

(1) "Thermal Composition and Doppler Velocities in a Transequatorial Loop
at the Solar Limb," J. W. Brosius, ApJ 636, L57 (2006 January 1).
http://www.journals.uchicago.edu/ApJ/journal/issues/ApJL/v636n1/20149/20149.html