Vector magnetography.

Details Vector magnetography. Vector magnetography.

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sopo.work...74r&link_type=abstract

Solar Polarimetry, Proceedings of the 11th Sacramento Peak Summper Workshop. Edited by L.J. November. Sunspot, NM: National Sola

Physics

2

Scientific paper

Development of the JHU/APL vector magnetograph (VMG) at the National Solar Observatory gives insight into the advantages and drawbacks of trying to infer solar active region magnetic fields from filtergram measurements with 0.8 - 3.0 arcsec spatial resolution, several-minute temporal resolution and 120 - 180 mÅ spectral resolution. The use of a narrow-band filter and the weak-field approximation (WFA) of the Stokes profiles gives good temporal and spatial data on magnetic fields, but sacrifices information on the thermodynamic parameters. A model of the VMG's response in the wings of the Ca I line at 6122 Å shows that the range of validity of the WFA can be extended to 4000 G. It also shows that the response of the VMG is insensitive to the Doppler shifts due to the motions (<1 km/s) exhibited by most solar features. The role of vector magnetography with a narrow-band filter in flare research is emphasized and several examples of early observations with the VMG are given.

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