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EP: Extraterrestrische Physik

EP 1: Heliosphäre 1

EP 1.2: Vortrag

Montag, 17. März 1997, 08:45–09:00, 332

Das EUV-Spektrum der Sonne — •W. Curdt¹, U. Feldman², and K. Wilhelm¹ — ¹Max-Planck-Institut f"ur Aeronomie, D-37189 Katlenburg-Lindau — ²Naval Research Laboratory, Washington, D.C. 20375, USA

SUMER – Solar Ultraviolet Measurements of Emitted Radiation – onboard of the SOHO – Solar and Heliospheric Observatory – obtained its first spectrum on January 25, 1996 near the north polar limb. The range from 660 Å to 1175 Å which has never before been observed with such a good spectral resolution contains 400 identified lines and a wealth of spectroscopic details. Other spectra with very diffent characteristics were obtained from off-limb observations. General spectral features of the most abundant elements H, He, C, N, O, Ne, Mg, Si, S, Ar, and Fe are described. In this spectral range many density- and temperature-sensitive line pairs are found. It is shown in examples how they can be used as diagnostic tools.