Exploring the interface between the Sun's surface and corona
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We present the science case for a broadband Xray imager with highresolution spectroscopy, including simulations of Xray spectral diagnostics of both active regions and solar flares. This is part of a trilogy of white papers discussing science, instrument (Bandler et al. 2010), and missions (Bookbinder et al. 2010) to exploit major advances recently made in transitionedge sensor (TES) detector technology that enable resolution better than 2 eV in an array that can handle high count rates. Combined with a modest Xray mirror, this instrument would combine arcsecondscale imaging with highresolution spectra over a field of view sufficiently large for the study of active regions and flares, enabling a wide range of studies such as the detection of microheating in active regions, ionresolved velocity flows, and the presence of nonthermal electrons in hot plasmas. It would also enable more direct comparisons between solar and stellar soft Xray spectra, a waveband in which (unusually) we currently have much better stellar data than we do of the Sun.
Kankelborg, Charles C. “Exploring the Interface Between the Sun’s Surface and Corona.” Physics Today 65, no. 4 (2012): 72. doi:10.1063/pt.3.1529.