ARTS 2.5.6

Pre-release for a EUMETSAT study.

ARTS 2.5.4

Pre-release for the halocarbon paper.

ARTS 2.4.0

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

General

• 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