Polarimetry and spectroscopy of a simple sunspot. 3: Velocity and magnetic field of sunspot umbral dots

Details Polarimetry and spectroscopy of a simple sunspot. 3: Velocity and magnetic field of sunspot umbral dots Polarimetry and spectroscopy of a simple sunspot. 3: Velocity and magnetic field of sunspot umbral dots

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...283..241s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 283, no. 1, p. 241-246

Astronomy and Astrophysics

Astrophysics

30

Magnetic Flux, Solar Magnetic Field, Solar Oscillations, Sunspots, Umbras, Astronomical Polarimetry, Line Spectra, Magnetic Spectroscopy

Scientific paper

Velocities and magnetic fields in sunspot umbrae and in umbral dots have been determined from high resolution Stokes-I spectra obtained at the Vacuum Tower Telescope (VTT) on Tenerife. Except for oscillatory motions the umbra is at rest and flow velocities in umbral dots, measured at an optical depth of about 0.01, are smaller than 25 m/s. The magnetic field strength is weakened in the dots by 10-20% for a central umbral dot and by 5-10% for a peripheral umbral dot. The line of sight decrease of magnetic field in a peripheral dot shows no difference to the surrounding umbra and amounts to 2.5-3 G/km.

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