# Progress in the Global Modeling of the Galactic Magnetic Field

## TL;DR

This paper reviews and improves models of the Galactic Magnetic Field using observational data, analyzing how these variations affect cosmic ray propagation within the Galaxy.

## Contribution

It introduces new variations of the Jansson & Farrar (2012) GMF model and assesses their impact on cosmic ray propagation using comprehensive observational constraints.

## Key findings

- Model variations significantly influence cosmic ray trajectories.
- Updated models better fit all-sky rotation measure data.
- Impacts on understanding of cosmic ray sources and propagation.

## Abstract

We discuss the global modeling of the properties of the Galactic Magnetic Field (GMF). Several improvements and variations of the model of the GMF from Jansson & Farrar (2012) (JF12) are investigated in an analysis constrained by all-sky rotation measures of extragalactic sources and polarized and unpolarized synchrotron emission data from WMAP and Planck. We present the impact of the investigated model variations on the propagation of ultrahigh-energy cosmic rays in the Galaxy.