Dear ARTS community,

Today we're happy to announce the release of ARTS 2.4. Since the last release 
in 2014, development has carried on and many new features and improvements have 
found its way into ARTS. Below you find a list of the most important changes.

Links to source code and documentation can be found on our homepage:

Updated atmlab and arts-xml-data packages are available as well:

Thanks to all of you who have been using ARTS in the past years for their 
science. We're looking forward to your feedback and contributions.

Key features

- New improved format for line-by-line data
- Non-LTE (pure-rotational non-overlapping, and non-chemical cases)
- Dedicated methods for heating rate calculations
- Basic simulations of radars (both single and multiple scattering)
- Radio link calculations not supported in this version
- Interfaces to DISORT and RT4 scattering solvers
- Jacobian for new quantities:
 - spectroscopic variables
 - particle properties (approximative)
- OEM type inversions inside ARTS
- TELSEM and TESSEM surface models
- PyARTS: Python bindings for ARTS


- Radiative transfer code (except MC) totally revised, including:
 - Higher consistency between modules
 - Higher calculation efficiency
 - Jacobian of atmospheric variables now fully analytical
- Absorption/LBL revised
 - Support for new lineshapes
 - Performance improvements
- New and extended system for defining particle size distributions
- DOIT improvements
 - Optimized pressure grid
 - Convergence acceleration
 - Optional precalculated first-guess field
- New sensor setup for passband-type, meteorological millimeter
 instruments (sensor_responseMetMM)

Known Issues

- TestSpectroscopy fails on macOS

Stay healthy and enjoy,
The ARTS Developers

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