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The coronagraph is an instrument enables the investigation of faint featuresin the vicinity of the Sun, particularly coronal mass ejections (CMEs). So farcoronagraphic observations have been mainly used to determine the geometric andkinematic parameters of CMEs. Here, we introduce a new method for thedetermination of CME temperature using a two filter (4025 A and 3934 A)coronagraph system. The thermal motion of free electrons in CMEs broadens theabsorption lines in the optical spectra that are produced by the Thomsonscattering of visible light originating in the photosphere, which affects theintensity ratio at two different wavelengths. Thus the CME temperature can beinferred from the intensity ratio measured by the two filter coronagraphsystem. We demonstrate the method by invoking the graduated cylindrical shell(GCS) model for the 3 dimensional CME density distribution and discuss itssignificance.

A New Method to Determine the Temperature of CMEs Using a Coronagraph Filter System