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The solar disk spectrum between 660 and 1175 Anstroms (first order) obtained by SUMER on SOHO

Wilhelm, K.; Curdt, W.; Lemaire, P. +3 more

SUMER -- Solar Ultraviolet Measurements of Emitted Radiation -- onboard of SOHO -- Solar and Heliospheric Observatory -- obtained its first spectrum on January 25, 1996 near the north polar limb. The range from 660 Angstroms to 1175 Angstroms which has never before been observed with such a good spectral resolution contains a wealth of spectroscop…

An adaptive grid code for high resolution 1-D hydrodynamics of the solar and stellar transition region and corona

Peres, G.; Reale, F.; Betta, R. +1 more

We present a new version of the Palermo-Harvard hydrodynamic model of plasma confined in coronal loops, based on a regridding algorithm which ensures limited variations of thermodynamical variables across grid points. The code provides an accurate description of the dynamics of the chromosphere-corona transition region, in spite of the very steep …