Two Practical Methods for Coronal Intensity Determination

TL;DR

This paper introduces two practical methods for accurately determining the solar corona's brightness from eclipse images, involving calibration and polarization-based intensity calculations.

Contribution

It presents novel techniques for intensity calibration and combined polarization image analysis in solar corona brightness measurement.

Findings

Effective calibration of photographic material achieved.

Accurate combined intensity values obtained from polarization images.

Methods improve precision of coronal brightness estimation.

Abstract

Determining the relative brightness of the solar corona is one of the most critical stages in solar eclipse studies. For this purpose, images taken with different exposures and polarization angles in white-light observations are used. The composite image of each polarization angle is produced by combining the images of different exposures. With the help of the intensity calibration function of these images, the relative intensity of the corona can be calculated. The total brightness of the solar corona is calculated using Stokes parameters obtained from intensity values of three polarization angles. In this study, two methods are presented: the first is used to obtain the intensity calibration function of the photographic material using calibration images, and the second is used to calculate the combined intensity values of images taken with different polarization angles.