Modeled magnetic field, bow shock position (red), and measured field and spacecraft position (blue). The input conditions for both models were calculated from OMNI solar wind observations using a Parker model for the propagation to the comet, and a gas production rate of Q = 5.8 × 10²⁷ s⁻¹. Day 0 corresponds to OMNI data from June 21, 2015. For readability, the magnetic field observations have been averaged over four minutes.