Solar Limb Theoretical Tomography at Millimeter, Sub-millimeter, and Infrared Wavelengths

TL;DR

This study investigates the tomography property of the solar limb across millimeter, sub-millimeter, and infrared wavelengths, revealing that it persists at limb altitudes with Bremsstrahlung dominating at higher frequencies.

Contribution

The paper demonstrates the continued presence of the solar limb tomography property in the spectrum and highlights the dominant role of Bremsstrahlung at certain frequencies using a new numerical approach.

Findings

Tomography property persists at the solar limb across studied wavelengths.

Bremsstrahlung dominates emission above the solar limb between 2 GHz and 5 THz.

The numerical code PakalMPI effectively models radiative transfer in the solar atmosphere.

Abstract

Semi-empirical models of the solar Chromosphere show in their emission spectrum, tomography property at millimeter, sub-millimeter, and infrared wavelengths for the center of the solar disk. In this work, we studied this property in the solar limb using our numerical code PakalMPI, focusing in the region where the solar atmosphere becomes optically thick. Individual contribution of Bremsstrahlung and H- opacities was take into account in the radiative transfer process. We found that the tomography property remains in all the spectrum region under study at limb altitudes. For frequencies be- tween 2 GHz and 5 THz the contribution of Bremsstrahlung is the dominant process above the solar limb.