Multi-Spacecraft EUV Tomography and 3D DEM

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

Midway, Utah, EEUU

Workshop; 2008 SHINE Workshop; 2008

SHINE Consortium

We present, for the first time in space science, tomography based on simultaneous multi-spacecraft images. The input data are in the form of images of the solar corona that were taken in April 2008 by the EIT and EUVI instruments on the SOHO and STEREO A and B satellites. The tomographic process results in 3D emissivities from the 171, 195 and 284 angstrom bands. We use movies of the corona to identify regions of minimal dynamics in which the stationarity assumption (required by the current tomography algorithm) is valid. From the 3D emissivities in these regions we calculate the 3D local differential emission measures (DEM) under the assumption that in each volume element the DEM has a Gaussian distribution. These results represent the first 3D differential emission measure determinations.