Evidence against turbulent and canopy-like magnetic fields in the solar chromosphere

Details Evidence against turbulent and canopy-like magnetic fields in the solar chromosphere Evidence against turbulent and canopy-like magnetic fields in the solar chromosphere

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998natur.392..256l&link_type=abstract

Nature, vol. 392, p. 256

Physics

78

Solar Magnetic Field, Chromosphere, Solar Atmosphere, Magnetohydrodynamic Turbulence, Line Spectra, Metallicity, Ground State, Sodium, Emission Spectra, Polarization Characteristics

Scientific paper

I report a mechanism that may explain observations of a surprising degree of polarization in the sodium doublet in the spectral lines emitted by gas near the sun's limb. It is assumed that the populations of the magnetic sublevels of the electronic ground state of the sodium atom are not equal: this leads to ground-level atomic polarization. This mechanism explains very well the observed line shapes and implies that depolarization does not occur in the solar chromosphere, which would seem to rule out the existence of turbulent magnetic fields and of horizontal, canopy-like fields stronger than about 0.01 G.

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