Coronal-Temperature-Diagnostic Capability of the Hinode/X-Ray Telescope Based on Self-Consistent Calibration. II. Calibration with on-Orbit Data

TL;DR

This paper recalibrates the Hinode/XRT's thicker filters using on-orbit data, enhancing its ability to diagnose a wide range of coronal temperatures more accurately.

Contribution

It provides an improved calibration of the XRT filters based on on-orbit data, refining the instrument's temperature diagnostic capabilities.

Findings

Revised calibration of thicker filters for active region observations.

Enhanced accuracy in coronal temperature diagnostics.

Validation of calibration improvements with on-orbit data.

Abstract

The X-Ray Telescope (XRT) onboard the Hinode satellite is an X-ray imager that observes the solar corona with the capability of diagnosing coronal temperatures from less than 1 MK to more than 10 MK. To make full use of this capability, Narukage et al. (Solar Phys. 269, 169, 2011) determined the thickness of each of the X-ray focal-plane analysis filters based on calibration measurements from the ground-based end-to-end test. However, in their paper, the calibration of the thicker filters for observations of active regions and flares, namely the med-Be, med-Al, thick-Al and thick-Be filters, was insufficient due to the insufficient X-ray flux used in the measurements. In this work, we recalibrate those thicker filters using quiescent active region data taken with multiple filters of XRT. On the basis of our updated calibration results, we present the revised coronal-temperature-diagnostic capability of XRT.