Diagnostics of the Thermal Structure of Off-Disk Quiet Sun Plasmas

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7509 Corona, 7549 Ultraviolet Emissions, 7554 X-Rays, Gamma Rays, And Neutrinos

Scientific paper

It has been suggested recently that the quiet solar corona, when observed outside the solar disk, is isothermal or near isothermal. If true, this result has profound consequences for any theoretical model trying to explain the thermal structure and the temperature of the quiet solar corona. In this work we study the thermal structure of the solar corona by combining simultaneous, long-exposure SOHO/SUMER and Hinode/EIS observations of the quiet solar corona that include the entire wavelength range of both instruments. We also analyze simultaneous Hinode/XRT observations of the study region. This comprehensive dataset includes lines emitted by many different types of transitions and by a very large number of ions, that enable us to obtain a very accurate determination of the thermal structure of the quiet solar corona.

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