Photometric analysis of the sunspot umbral dots. I - Dynamical and structural behaviour

Details Photometric analysis of the sunspot umbral dots. I - Dynamical and structural behaviour Photometric analysis of the sunspot umbral dots. I - Dynamical and structural behaviour

Sep 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....89...88a&link_type=abstract

Astronomy and Astrophysics, vol. 89, no. 1-2, Sept. 1980, p. 88-94.

Physics

23

Astronomical Photometry, Solar Physics, Sunspots, Histograms, Life (Durability), Radiant Flux Density, Statistical Analysis

Scientific paper

A sequence of selected high resolution white light pictures of a unipolar sunspot was studied in order to measure the main characteristics of umbral dots size, contrast value, and lifetime. Using a statistical analysis, the behavior of a typical dot was deduced. The large effect of smearing on the values of umbral intensities and sizes of umbral dots is discussed. This study considers the computed values of radiative flux, as obtained from measured sizes and contrasts; this parameter is presumably free of instrumental effects. An analytic function is proposed to describe the time variation of some of the umbral dots.

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