A Large Scale Magneto-ionic Fluctuation in the Local Environment of Periodic Fast Radio Burst Source, FRB 20180916B

Understand

Fast radio burst (FRB) source 20180916B exhibits a 16.33-day periodicity in its burst activity.

• It is as of yet unclear what proposed mechanism produces the activity, but polarization information is a key diagnostic.
• Here, we report on the polarization properties of 44 bursts from FRB 20180916B detected between 2018 December and 2021 December by CHIME/FRB, the FRB project on the Canadian Hydrogen Intensity Mapping Experiment the Canadian Hydrogen Intensity Mapping Experiment.
• In contrast to previous observations, we find significant variations in the Faraday rotation measure (RM) of FRB 20180916B.