SQUV & PCA: reduction tools for THÈMIS by A. Sainz Dald & A. López Ariste.

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Presentation transcript:

SQUV & PCA: reduction tools for THÈMIS by A. Sainz Dald & A. López Ariste

WHAT IS SQUV? ➢ Stokes Quick Viewer is a tool for the THÈMIS MTR data. ➢ It is a set of IDL routines and functions with a GUI. ➢ The input are the THÈMIS data; the output is a standard fits file with the Stokes parameters. ➢ It is stable, easy and for general porpouse use. ➢ It is one more code for THÈMIS data, my best reduction code. ➢ It is not perfect! I try to improve but it will not be perfect!

WHAT IS NOT SQUV? ➢ It is NOT a scientist!! It does NOT Science. ➢ It is NOT perfect! I try to improve but it will not be perfect!

HOW DOES IT WORK?

THE FFs

HOW DOES IT WORK?

THE DEMODULATION PROBLEM ➢ Linear system determined (n=4) or overdetermined (n>4) ➢ It is solved by Singular Value Decomposition and 'back- substitution' method.

HOW DOES IT WORK?

THE STOKES PARAMETERS

INVERSION: PCA CODE ➢ PCA: Fast and stable (Rees et al, 2001; Socas-Navarro et al, 2002; López Ariste & Casini, 2002, Casini et al, 2003) ➢ Limited to the Fe I and lines ➢ Milne-Eddington model atmosphere (linear source function, constant with height otherwise ➢ Main result: Vector magnetic field with filling factor

PCA implementation ➢ The code uses as input the *_r3.fts files, output of the SQUV data reduction code. ➢ It produces as output a *_m3.fts file producing all the THEMIS observation keywords and a 2D image for each one of the model parameters plus its error bar. ➢ The PCA database is unique and not open to user modification

EXAMPLES: August 2004 (ASD & ALA)

MORE EXAMPLES: Nov 2003 (VB)

MORE EXAMPLES: November 2003 (VB)

FUTURE...IS NOW ➢ Automatic reduction: select the files, click-on 'Start SQUV'...et voilà!!! ➢ SQUV & PCA are in THÈMIS acquisition chain. ➢ Don't worry! Be happy! THÈMIS works for you: SQUV target in IO. PCA for Fe I and Å. ➢ Maps of scans in several formats:.eps,.jpg,.fits &.sav. ➢ Maps of scans on the observation logs.

FUTURE...IS NOW ➢ How does the scan look? Nice!!! ➢ Where has the scan been done?...on the Sun, of course!