Abstracts Details


First Name * : João Manuel
Last Name * : da Silva Santos
Affiliation * : Institute for Solar Physics, Stockholm University
Abstract Type * : Oral
Title * : What do IRIS and ALMA tell us about plage: first inversion results
Author(s) * : J. M. da Silva Santos, J. de la Cruz Rodriguez, J. Leenaarts, G. Chintzoglou, B. de Pontieu
Abstract Session * : Thermal and magnetic coupling through the atmosphere
Abstract * : IRIS observations have shown that the bright magnetic patches, so-called plage, typically feature broader and brighter MgII h and k lines, suggesting that the chromosphere above plage is hotter and denser than in the quiet-Sun. However, not all line broadening is thermal in nature; microturbulence velocities of up to 10 km/s have been inferred from non-LTE inversions. ALMA offers a new view into the solar chromosphere at radio wavelengths, and a convenient LTE diagnostic potential which should help diagnosing local temperatures. This is encouraged by experiments based on synthetic spectra from 3D MHD simulations that have shown that one can obtain more accurate temperature stratifications when the millimetre continua is simultaneously fitted along with IRIS near-UV data. Here we report on the results of the first-ever joint inversions of real IRIS and ALMA data. We present constraints on temperature and microturbulence of active region plage compared to the neighbouring quiet-Sun, and comment on the formation heights of these diagnostics.