Photoelectric polarimetry of a dark unipolar sunspot

摘要: Photoelectric polarisation measurements in a stable sunspot (type H) with particularly dark umbra carried out the Capri magnetograph have been evaluated terms of Unno's (1956) theory to give value and direction magnetic field vector. A linear increase inclination angle distance from spot centre up tor ≈ 1.2Rs results, as originally found by Hale Nicholson (1938) different procedure. The strength decreases maximum (about 3300Γ) about 15% at penumbral border, still continuously decreasing outside spot. projected deviates considerably radial symmetry several parts region, but it is good agreement that overlaying chromospheric structures.