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Table C.1

Properties of the large-scale and small-scale magnetic field of AU Mic derived with ZDI, for the 11 data subsets

Stokes IV analysis (fI = 0.9, fV = 0.2, vD = 3.5 km s−1)
Season <BV> (kG) <BI> (kG) <Bs > (kG) Bd (kG) tilt/phase (°/) pol/axi (%)
2019B 1.15 5.2 3.18 / 0.46 1.38 10 / 0.52 97 / 97
2020A 1.04 4.7 2.91 / 0.15 1.31 16 / 0.74 98 / 93
2020B 1.03 4.6 2.79 / 0.14 1.29 16 / 0.79 98 / 93
2021A 1.00 4.5 2.70 / 0.41 1.29 18 / 0.82 97 / 92
2021B 0.93 4.2 2.52 / 0.50 1.18 17 / 0.84 97 / 93
2022A 0.92 4.1 2.52 / 0.50 1.15 14 / 0.78 97 / 95
2022B 0.86 3.9 2.46 / 0.51 1.08 16 / 0.80 99 / 95
2023A 0.98 4.4 2.66 / 0.33 1.18 9 / 0.54 98 / 98
2023 B 0.95 4.3 2.50 / 0.29 1.17 11 / 0.57 98 / 98
2024A 0.97 4.4 2.63 / 0.25 1.20 11 / 0.61 98 / 98
2024B 1.04 4.7 2.78 / 0.33 1.25 11 / 0.61 98 / 97

Notes. Columns 2 and 3 respectively list the large-scale and small-scale fields, once quadratically averaged over the whole stellar surface. Column 4 gives the time-averaged and full-amplitude variations of the small scale field integrated over the visible hemisphere <Bs> (as if measured from Zeeman broadening of lines profiles), whereas columns 5 to 7 respectively list the polar strengths of the dipole component Bd, the tilt of the dipole component to the rotation axis and the phase towards which it is tilted, and finally the amount of magnetic energy reconstructed in the poloidal component of the field and in the axisymmetric modes of this component. Error bars on field values and percentages are typically equal to 10%, whereas dipole tilts are accurate to typically 5°.

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