Title: Using low-frequency pulsar observations to study the 3-D structure of the Galactic magnetic field,
Abstract: The Galactic magnetic field (GMF) plays a role in many astrophysical
processes and is a significant foreground to cosmological signals, such as the
Epoch of Reionization (EoR), but is not yet well understood. Dispersion and
Faraday rotation measurements (DMs and RMs, respectively) towards a large
number of pulsars provide an efficient method to probe the three-dimensional
structure of the GMF. Low-frequency polarisation observations with large
fractional bandwidth can be used to measure precise DMs and RMs. This is
demonstrated by a catalogue of RMs (corrected for ionospheric Faraday rotation)
from the Low Frequency Array (LOFAR), with a growing complementary catalogue in
the southern hemisphere from the Murchison Widefield Array (MWA). These data
further our knowledge of the three-dimensional GMF, particularly towards the
Galactic halo. Recently constructed or upgraded pathfinder and precursor
telescopes, such as LOFAR and the MWA, have reinvigorated low-frequency science
and represent progress towards the construction of the Square Kilometre Array
(SKA), which will make significant advancements in studies of astrophysical
magnetic fields in the future. A key science driver for the SKA-Low is to study
the EoR, for which pulsar and polarisation data can provide valuable insights
in terms of Galactic foreground conditions.