Measurement of polarization-dependent Stark broadening as a diagnostic of electric fields in the solar atmosphere.

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Scientific paper

Electric fields play a key role in models of energy dissipation and charged particle acceleration in flares, as well as other dynamic solar phenomena. An instrument designed to observe the transverse (to the line of sight) component of such electric fields has been constructed and installed at the 40 cm coronagraph at Sacramento Peak. This "electrograph" measures the halfwidth of Stark-broadened hydrogen emission lines as a function of polarization in the sky plane. Thus, the instrument resembles a transverse magnetograph except that it operates on Stark-broadened hydrogen emission lines in coronal structures rather than on Zeeman-broadened absorption lines on the disk. The authors describe the principles behind the instrument, its design, and some first data.

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