The 3D Solar Minimum with Differential Emission Measure Tomography

ALBERTO M. VASQUEZ; FRAZIN, RICHARD A.; HUANG, ZHENGUANG; MANCHESTER IV, WARD B.; SHEARER, PAUL

Mendoza, Argentina

Simposio; IAU Symposium 286: Comparative Magnetic Minima: Characterizing Quiet Times in the Sun and Stars; 2011

IAU

Differential emission measure tomography (DEMT) makes use of extreme ultraviolet (EUV) image series to deliver two products: a) the three-dimensional (3D) reconstruction of the coronal emissivity in the instrumental bands, and b) the 3D distribution of the local differential emission measure (LDEM). The LDEM allows, in turn, construction of 3D maps of the electron density and temperature distribution. DEMT is being currently applied to the space-based EUV imagers SOHO/EIT, STEREO/EUVI, and SDO/AIA, allowing reconstruction of the inner corona in the height range 1.00 to 1.25 R⊙ . In this work we applied DEMT to EUVI data of the last solar minimum (2008), and EIT data of the previous solar minimum (1996). We show here comparative results, discussing the observed 3D density and temperature distributions in the context of global potential magnetic field magnetic extrapolations. We also compare the DEMT results with other observational and modeling efforts of the same periods.