The Multi-thermal Plasma of Coronal Streamers as seen with SDO/AIA Tomography

Differential emission measure tomography (DEMT) of the solar corona is performed using all 6 coronal bands on the Atmospheric Imaging Assembly (AIA) telescope, on board Solar Dynamics Observatory (SDO). For the present study the updated CHIANTI (v 7.1) spectra and latest effective areas released by the AIA team are used. These updates imply significant changes in the low temperature responses of all bands and the high temperature responses of the 94 and 131 Å~ bands. The increased number of coronal bands, 6 instead of 3 when compared to the previous EUV space telescopes, allows the implementation of a multi-modal parametrization for the local differential emission measure (LDEM), the final product of the DEMT technique. As target of study, for this work we use data from one of the earliest Carrington rotations (CR) for which AIA produced a full data set, namely CR-2099. The period was chosen as to analyze the quiet Sun corona. Our study reveals the multi-modal nature of the LDEM distribution of the coronal plasma at the tomographic spatial resolution level. The multi-modality is stronger for hotter regions (within the closed fields of streamer regions) and less important for cooler ones (in the coronal holes). We discuss the implications of our findings to the investigation of the solar corona heating problem.