atmos_clim/refractive

# Refractive index and optical data for aerosols used by AGNI/SOCRATES.

Refractive indices (optical constants n, k) of aerosol and cloud condensate materials. These are used by AGNI to calculate aerosol optical properties at runtime using Mie theory.

Download these files with `./src/get_data.sh refractive` from an AGNI install.

Each file <id>.txt contains three numeric columns: wavelength [micron], n, k. The <id> is
the material name used in the `nk_file` config key. Header lines begin with '#'.

Data are largely taken from Mullens et al., 2024.

```bibtex

@article{mullens_implementat_2024,
    author = {Mullens, Elijah and Lewis, Nikole K. and MacDonald, Ryan J.},
    title = {{Implementation of Aerosol Mie Scattering in POSEIDON with Application to the Hot Jupiter HD 189733 b{'}s Transmission, Emission, and Reflected Light Spectrum}},
    journal = {Astrophys. J.},
    volume = {977},
    number = {1},
    pages = {105},
    year = {2024},
    month = dec,
    issn = {0004-637X},
    publisher = {The American Astronomical Society},
    doi = {10.3847/1538-4357/ad8575}
}

```