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- W1550831936 abstract "Spectroscopic magnetic field measurements in sunspots have been carried out at Kodaikanal since such research was started by John Evershed (Evershed 1944). Subsequently, a Stokes polarimeter was built by Balasubramaniam and collaborators for the spectrograph at the Kodaikanal Tower Telescope (KTT), with the goal of measuring vector magnetic fields. Although the achieved accuracy is limited, the telescope model developed by them is very accurate (Balasubramaniam et al. 1985) and is still used even today to correct for instrumental polarization. A similar polarimeter was developed by Sankarasubramanian and collaborators, which is more modern in having motorized rotation of the polarization optics and in using CCD detectors instead of photographic registration on film (Sankarasubramanian et al. 2002). The accuracy in magnetic field measurement achieved with this instrument was quite high. Very recently, a dual-beam polarimeter has been installed, which uses an efficient and well-balanced modulation scheme. The calibration and characterization of this instrument are presented in Nagaraju et al. (2008b); results on magnetic structuring from the photosphere to the chromosphere are presented in Nagaraju et al. (2008a, 2009)." @default.
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- W1550831936 date "2009-10-22" @default.
- W1550831936 modified "2023-09-26" @default.
- W1550831936 title "Sunspot Magnetometry from Kodaikanal" @default.
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- W1550831936 doi "https://doi.org/10.1007/978-3-642-02859-5_69" @default.
- W1550831936 hasPublicationYear "2009" @default.
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