Comparing simultaneous measurements by two high-resolution imaging spectropolarimeters: the `Goettingen' FPI@VTT and CRISP@SST

TL;DR

This study compares high-resolution spectropolarimetric measurements from two different instruments observing the same solar active region, demonstrating their consistency and confirming the reliability of FPI-based spectro-polarimeters.

Contribution

It provides a direct comparison of two independent high-resolution spectropolarimeters, validating their measurement accuracy and consistency in solar observations.

Findings

High agreement between FPI@VTT and CRISP@SST data maps.

FPI maps show resemblance to TIP spectrographic observations.

Confirms the reliability of FPI-based spectro-polarimeters.

Abstract

In July 2009, the leading spot of the active region NOAA11024 was observed simultaneously and independently with the 'Goettingen' FPI at VTT and CRISP at SST, i.e., at two different sites, telescopes, instruments and using different spectral lines. The data processing and data analysis have been carried out independently with different techniques. Maps of physical parameters retrieved from 2D spectro-polarimetric data observed with 'Goettingen' FPI and CRISP show an impressive agreement. In addition, the 'Goettingen' FPI maps also exhibit a notable resemblance with simultaneous TIP (spectrographic) observations. The consistency in the results demonstrates the excellent capabilities of these observing facilities. Besides, it confirms the solar origin of the detected signals, and the reliability of FPI-based spectro-polarimeters.