The new solar magnetograph for the Canary Islands Observatory THEMIS

Details The new solar magnetograph for the Canary Islands Observatory THEMIS The new solar magnetograph for the Canary Islands Observatory THEMIS

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985svmf.nasa..219r&link_type=abstract

In NASA. Marshall Space Flight Center Meas. of Solar Vector Magnetic Fields p 219-230 (SEE N85-29869 18-92)

Physics

4

Canary Islands, Magnetic Signatures, Polarimetry, Polarization (Waves), Solar Magnetic Field, Spectrographs, Spectroheliographs, Spectroscopic Telescopes, Sun, Birefringence, Design Analysis, High Resolution, Thermodynamics

Scientific paper

THEMIS was designed for accurate polarization measurements in order to determine the intensity and direction of the magnetic field without interference with the local variations of the thermodynamical parameters. That goal leads to the following requirements: (1) high spatial resolution in horizontal direction; (2) sufficient resolution in height, which requires observations in several spectral lines with a sufficient spectral resolution; (3) accurate polarization measurements; (4) adequate time coverage to follow the evolution of individual structures; (5) precise tracking and scanning mechanisms; and (6) sufficient field of view for the different observed structures. The design of the instrument is discussed in detail.

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