Infrared lines as probes of solar magnetic features. VI. The thermal-magnetic relation and Wilson depression of a simple sunspot

Details Infrared lines as probes of solar magnetic features. VI. The thermal-magnetic relation and Wilson depression of a simple sunspot Infrared lines as probes of solar magnetic features. VI. The thermal-magnetic relation and Wilson depression of a simple sunspot

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...277..639s&link_type=abstract

Astronomy and Astrophysics, Vol. 277, p. 639 (1993)

Astronomy and Astrophysics

Astrophysics

47

Sunspots - Sun (The): Magnetic Fields Mhd

Scientific paper

We analyse the relationship between the temperature and the magnetic vector, as derived from 1.56 μm spectra, in a simple sunspot. Due to the high Zeeman sensitivity of the = 3, 1.56 μm line, we can study this relationship throughout the sunspot. We confirm the field-strength, B, vs. temperature, T, relationship found by Kopp & Rabin (1992). In addition, we also find a linear relation between the magnetic inclination angle, γ′, and T. An analysis based on the assumption of magnetohydrostatic force balance gives an estimate of the Wilson depression, ZW, throughout the sunspot. Our analysis supports a jump in ZW of 200-500 km at the umbral boundary and agrees with a relatively constant ZW in the penumbra. In addition, we constrain various gradients of magnetic parameters and judge the strength of magnetic curvature forces. For example, we set tight limits on the vertical gradient of γ′, the magnetic inclination angle to the vertical, in the penumbra. Finally, we discuss the consequences for, e.g., the model proposed by Sanchez Almeida & Lites (1992) to explain the broad-band circular polarization measured in sunspots.

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