Draping of the Interstellar Magnetic Field over the Heliopause - A Passive Field Model
arXiv:1504.00585 · doi:10.1088/0004-637X/805/2/153
Abstract
As the local interstellar plasma flows past our heliosphere, it is slowed and deflected around the magnetic obstacle of the heliopause. The interstellar magnetic field, frozen into this plasma, then becomes draped around the heliopause in a characteristic manner. We derive the analytical solution for this draped magnetic field in the limit of weak field intensity, assuming an ideal potential flow around the heliopause, which we model as a Rankine half-body. We compare the structure of the model magnetic field with observed properties of the IBEX ribbon and with in situ observations at the Voyager 1 spacecraft. We find reasonable qualitative agreement, given the idealizations of the model. This agreement lends support to the secondary ENA model of the IBEX ribbon and to the interpretation that Voyager 1 has crossed the heliopause. We also predict that the magnetic field measured by Voyager 2 after it crosses the heliopause will not be significantly rotated away from the direction of the undisturbed interstellar field.
Astrophysical Journal, in press
References in corpus (7)
- Draping of Cluster Magnetic Fields over Bullets and Bubbles -- Morphology and Dynamic Effects
- Probing Heliospheric Asymmetries with an MHD-kinetic Model
- Revisiting Ulysses Observations of Interstellar Helium
- Spatial Confinement of the IBEX Ribbon: A Dominant Turbulence Mechanism
- Why are the magnetic field directions measured by Voyager 1 on both sides of the heliopause so similar?
- Correcting the record on the analysis of IBEX and STEREO data regarding variations in the neutral interstellar wind
- Steady-State Magnetohydrodynamic Flow Around an Unmagnetized Conducting Sphere