A Calcium-Based Magneto-Optical Filter

Details A Calcium-Based Magneto-Optical Filter A Calcium-Based Magneto-Optical Filter

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsh13c..13r&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SH13C-13

Astronomy and Astrophysics

Astrophysics

7500 Solar Physics, Astrophysics, And Astronomy, 7507 Chromosphere, 7522 Helioseismology, 7524 Magnetic Fields, 7594 Instruments And Techniques

Scientific paper

The magneto-optical filter, MOF [1], has been used for imaged Doppler and magnetic field observations of the Sun for nearly three decades. The strengths of the MOF lie in its wavelength stability, its narrow pass-band (approx. 0.005nm) and high throughput. Until recently, its main limitation has been that it has only been available for use with the Na I (sodium) and K I (potassium) D-lines. We will discuss some developments in the technology for building the vapor cells for the MOF and will show preliminary results for a calcium-based MOF. The Ca I line at 422nm is formed in the mid-chromosphere and can thus provide a probe for velocity and magnetic field information for this region. [1] Cacciani and Fofi, Solar Phys. 59, 1978

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