HR: 14:15h
AN: SH42D-03    [PDF]
TI: Multi-Channel Polarimeter for Coronal Magnetic Filed Measurements
AU: * Tomczyk, S
EM: tomczyk@ucar.edu
AF: HAO/NCAR, 1850 Table Mesa Dr., Boulder, CO 80307 United States
AB: We are currently building a filter-based polarimeter optimized for the measurement of magnetic fileds in the solar corona through observations of the coronal emission lines of Fe XIII at 1074.7 and 1079.8 nm. The instrument consists of a polarimeter allowing complete Stokes I,Q,U,V measurement followed by a Lyot birefringent filter with dual passbands of 0.14 nm width. Both the polarimeter and filter employ liquid crystals for rapid electro-optical tuning. This instrument will be deployed at the One Shot coronagraph at NSO Sac Peak. Measurement of the longitudinal Zeeman effect will yield information on the strength of the line-of-sight component of the magnetic field while the observation of resonance scattering will constrain the plane-of-sky field direction. Precise measurement of plasma velocity will also be possible. Such measurements are critical for addressing many outstanding problems in coronal physics. The operation and performance of the instrument will be described. We will also describe the methodology for the coronal magnetic field measurement. Preliminary measurements with the instrument at the One Shot coronagraph will be presented.
DE: 7509 Corona
DE: 7524 Magnetic fields
DE: 7594 Instruments and techniques
SC: SPA - Solar and Heliospheric Physics [SH]
MN: 2003 Fall Meeting