Research on sunspot Oscillations - I. The Pulkovo CCD Spectroheliograph-Magnetograph

Details Research on sunspot Oscillations - I. The Pulkovo CCD Spectroheliograph-Magnetograph Research on sunspot Oscillations - I. The Pulkovo CCD Spectroheliograph-Magnetograph

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003soph..213..291p&link_type=abstract

Solar Physics, v. 213, Issue 2, p. 291-299 (2003).

Physics

3

Scientific paper

The CCD spectroheliograph-magnetograph is a focal-plane ancillary instrument for the Pulkovo horizontal solar telescope ACU-5. The instrument is placed at an exit port of an isothermal high-resolution diffraction-grating spectrograph. A modified Leighton optical scheme for registration of sunspot magnetic fields is used. The instrument provides FITS-format digital video maps of radial velocities, magnetic fields, and spectroheliograms in any line of the spectral region 3900-11000 Å. The time to obtain one video map of size 91''×154'' is equal to 10.24 s. The angular resolution of the instrument is 0.8'' spectral resolution is 0.01-0.03 Å. Since 1996 the Pulkovo CCD spectroheliograph-magnetograph has been used to obtain high spatial and temporal resolution observations of oscillations of radial velocities and magnetic fields in the photospheric layers of sunspots.

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