The magneto-optical filter, working principles and recent progress

Details The magneto-optical filter, working principles and recent progress The magneto-optical filter, working principles and recent progress

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984sses.nasa..115c&link_type=abstract

In its Solar Seismology from Space. p 115-123 (SEE N85-25060 14-92)

Computer Science

1

Magnetic Signals, Optical Filters, Solar Activity, Solar Magnetic Field, Solar Oscillations, Solar Velocity, Fabry-Perot Spectrometers, Magnetic Measurement, Polarized Radiation, Signal To Noise Ratios, Transparence, Velocity Measurement, Wavelengths, Zeeman Effect

Scientific paper

The Magneto-Optical Filter is described which allows simultaneous magnetic and velocity measurements (in both imaging and non-imaging modes) without the need for a spectrograph. In this way the stability and alignment problems of the spectrograph are completely overcome. Its major advantages are: wavelength absolute reference and stability, high signal to noise ratio and independence of the transmission profile from the incidence angle of the solar beam. It is an imaging instrument allowing high wave number analysis in the solar oscillation spectrum and a continuous monitoring of the image position through the chromospheric facular structures. The apparatus in use at Mt. Wilson is assembled in a modular form. The most important part of it is a glass cell containing the sodium vapor. The filter is easy to use but the cell is not easy to construct in an optimal way. The technology is in progress both to use Na and K together and to prevent the windows from becoming coated during a long-term operation.

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