3D Coronal Temperatures from Tomographic Analysis of EIT 17.1, 19.5 and 28.4 nm Images

FRAZIN, RICHARD A.; VÁSQUEZ, ALBERTO M.; KAMALABADI, FARZAD

San Francisco - California, EEUU

Congreso; American Geophysical Union, Fall Meeting 2006.; 2006

AGU

We present for the first time, 3D electron temperatures determined from a tomographic analysis of a time series of EUV images taken in multiple bands. The method, developed theoretically in a previous paper [Frazin et al. 2005, ApJ v. 628, p. 1070], involves a combination of solar rotational tomography (SRT) and classical differential emission measure (DEM) analysis. SRT uses solar rotation to "undo" the line-of-sight integrals, while DEM analysis determines the temperature in each voxel. Although temporal variations of the solar corona limit the applicability to structures that remain relatively stable on long time scales (days), we find that we can achieve consistent results for certain types of objects such as sub-polar quiet regions at solar minimum. We anticipate dramatic increases in the time resolution of this technique with the STEREO mission.