NICER observation list: Target ID 454903

Magnetars are young highly-magnetized isolated neutron stars with emission peaking in the X-ray band. The decay of their super-strong magnetic fields fuels their high energy radiation. Here, we propose a yearly monitoring program of six magnetars with NICER to establish their spectral and phase-coherent timing properties. Such a campaign will refine our understanding of these unique sources by discovering new spin-up and spin-down glitches and revealing their relative strengths and recovery times, and uncover new burst and outburst epochs. Such observational results are crucial to guide the development of the crust theory in the regime of super-strong B-fields, and the link between crustal and magnetospheric physics which dictate the connection between all of the above phenomena.