Unified Picture of the Local Interstellar Magnetic Field from Voyager and IBEX

Abstract Prior to the Voyagers’ heliopause crossings, models and community expected magnetic field show major rotations across boundary. Surprisingly, showed no significant change in direction from heliospheric Parker Spiral at either Voyager location. Meanwhile, a result IBEX mission is derived magnitude of interstellar far Sun (∼1000 au) beyond influence heliosphere. Using self-consistent model fit ribbon data, Zirnstein et al. reported that this “pristine” local has 0.293 nT 227° ecliptic longitude 34.°6 latitude. These values differ by 27% (51%) 44° (12°) what 1 (2) currently observes (as ∼2022.75). While differences are be as undrapes away heliosphere, global structure draping hundreds astronimcal units not been reconciled. This leads several questions: How these distinct sets observations reconcilable? What field’s large-scale structure? out would future need go sample unperturbed field? Here, we if realistic errors included for difficult-to-calibrate radial component, measured transverse consistent with predicted IBEX, allowing us answer questions through unified picture behavior its around unfolding into pristine medium.