Introduction & Course Overview
The tutorial focuses on performing synthesis for spectral lines under both local thermodynamic equilibrium (LTE) and non-LTE conditions.
Students will learn to include calcium and satellite lines in their synthesis exercises.
Setting Up the Model Atmosphere
A specific model atmosphere is created using a constant magnetic field and linear gradients for better analysis.
Key parameters such as velocity and magnetic field strength are varied to observe their effects on spectral signatures.
Synthesis of Iron Lines at 630 nm
Initial synthesis is based on iron lines, focusing on LTE conditions.
Three grid files are created for structured synthesis, allowing for easier comparison of results.
Introducing Calcium Lines
Calcium lines at 8498 and 8542 nm are introduced in the synthesis process.
These transitions are added to better understand atmospheric effects on spectral profiles.
Comparing Profiles with Atlas Data
Profiles synthesized are compared with data from spectral atlases for validation.
This check helps determine the accuracy of the atomic parameters used in synthesis.
Conclusion & Key Takeaways
Different atmospheric gradients lead to varying signatures in the synthesized profiles, demonstrating the need for careful atmospheric modeling.
Understanding how to include and analyze different lines can significantly enhance the quality of spectral data analysis.
Angular Momentum Coupling Types
Discussion on total angular momentum and different coupling schemes including LS, JJ, and JK coupling.
Explanation of the importance of these coupling schemes in understanding atomic levels.
Significance of Atomic Parameters
Overview of how atmospheric differences affect atomic parameters.
Mention of HSRA (Hybrid Solar Radio Astronomical) model limitations compared to more recent models.
Corrections and Enhancements in Synthesis
Introduction to microtubule corrections and their role in improving line core intensity.
Importance of accurately representing the instrument's point spread function for reliable results.
Evaluation and Error Checking
Recommendation to examine provided examples for better understanding of LTE (Local Thermodynamic Equilibrium) and non-LTE computations.
Emphasis on the importance of checking atomic information and potential typos in data preparation.
Upcoming Classes and Learnings
Overview of topics for future classes, including the computation of response functions and line file preparation.
Plan to review enhancements due to collisions and coupling effects.
DeSIRe inversion code online tutorial, Day 3: How to perform synthesis of the full Stokes vector
DeSIRe inversion code online tutorial, Day 3: How to perform synthesis of the full Stokes vector
Install Browsy