There's No Such Thing as the Quiet Sun: EUV Movies from SOHO

Details There's No Such Thing as the Quiet Sun: EUV Movies from SOHO There's No Such Thing as the Quiet Sun: EUV Movies from SOHO

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.3718g&link_type=abstract

American Astronomical Society, 188th AAS Meeting, #37.18; Bulletin of the American Astronomical Society, Vol. 28, p.880

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present unique time series of high-resolution solar images from the normal-incidence Extreme ultraviolet Imaging Telescope (EIT) on board the SOHO spacecraft. With a pixel scale of 2.6 arc sec and a detector dynamic range of > 10(4) , the EIT can be used to study the dynamics of chromospheric and coronal features in multilayer bandpasses optimized for He II 304 Angstroms (0.08 MK), Fe IX/X 171, 173 Angstroms (0.8 - 1.0 MK), Fe XII 195 Angstroms (1.5 MK), and Fe XV 284 Angstroms (2.0 - 2.5 MK). Among the most striking features of the digital movies we will display are: the dynamic nature of small-scale loop features in the polar coronal holes, the constant activity of the polar crown filament systems, the locations of the bases of polar plumes, the presence of dark (scattering) filament material in the coronal emission line images, and the evolution of a unique, linear, dark feature in a young active region. The latter feature is suggestive of the ``coronal void'' observed in the electron scattering corona by Macqueen et al./ (1983).

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