The structure of sunspots. IV - Magnetic field strengths in small sunspots and pores

Details The structure of sunspots. IV - Magnetic field strengths in small sunspots and pores The structure of sunspots. IV - Magnetic field strengths in small sunspots and pores

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982soph...80..251b&link_type=abstract

Solar Physics, vol. 80, Oct. 1982, p. 251-258.

Physics

37

Field Strength, Solar Magnetic Field, Sunspots, Line Spectra, Penumbras, Photosphere, Solar Spectra, Spectrograms, Umbras

Scientific paper

Magnetic field strengths in small umbrae and pores are measured using the line Ti I λ6064.6 Å, which is formed purely in umbrae. We find field strengths between 1900 and 2600 G in the darkest parts of small umbrae and of well established pores; the spread is partly intrinsic. The field strength in diffuse transient "protopores" amounts to 1500 ± 250 G.
We demonstrate that usage of the well-known magnetic line λ6l73.3 Å and other Fe I lines yield systematically smaller magnetic field strengths than Ti I λ6064.6 Å. This is due to blending of the σ components with the central component due to photospheric stray light and the it component. Routine measurements are therefore unreliable for small spots (Aμ ≲ 10 × 10-6).

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