Multi-modal DEM in the solar corona

NUEVO, FEDERICO A.; VÁSQUEZ, ALBERTO M.; FRAZIN, RICHARD A.; LANDI, ENRICO

Tandil

Conferencia; Reunión anual de la Asociación Argentina de Astronomía; 2013

Asociación Argentina de Astronomia

Differential emission measure tomography (DEMT) uses time series of coronal EUV images covering a full solar rotation to determine the three-dimensional (3D) distribution of the local differential emission measure (LDEM). The LDEM of each tomographic voxel is a measure of the thermal distribution of the plasma within the cell. The LDEM inversion problem is under-determined and solved by modeling the LDEM as a function with free parameters. In this work we implemented unimodal and non-unimodal LDEM models constrained by data of 3 to 4 bands of the Atmospheric Imaging Assembly (AIA) instrument on board the Solar Dynamics Observatory (SDO) mission. Our study reveals a multi-modal nature of the LDEM distribution of the global coronal plasma at the tomographic resolution level.