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Structure of a simple sunspot from the inversion of IR spectral data

Krupp, N.; Woch, J.; Solanki, S. K. +5 more

Analysis of spectral data of two neighboring infrared lines, Fe i 15648.5 Å (g = 3) and Fe i 15652.9 Å (g_eff = 1.53) are carried out for a simple sunspot when it was near the solar disk center (mu = 0.92), to understand the basic structure of sunspot magnetic field. Inversions of Stokes profiles are carried out to derive different atmospheric par…

Hot loop oscillations seen by SUMER

Solanki, S. K.; Curdt, W.; Innes, D. E. +2 more

Solar observations from space and from the ground

Curdt, W.

Recent results from space missions like YOHKOH, SOHO or TRACE as well as ground-based observations clearly indicate that physical processes of most solar phenomena take place on small scales, which are still below the resolution of the instruments employed. There is an urgent need for observations at higher resolution and also for their extension …

Does the ion cyclotron exist in the inner corona?

Raouafi, N. -E.

The present work is about the interpretation of the linear polarization of the O {vi} D_2 (lambda1032 ) coronal line observed by SUMER/SoHO. We take into account the effect of the Doppler redistribution due to the scattering ions motion. We consider the cases of isotropic and anisotropic velocity field distributions. The latter can be interpreted …