The S1 Shell and Interstellar Magnetic Field and Gas near the Heliosphere

Abstract

Many studies of the Loop I magnetic superbubble place the Sun at the edges of the bubble. One recent study models the polarized radio continuum of Loop I as two magnetic shells with the Sun embedded in the rim of the 'S1' shell. If the Sun is in such a shell, it should be apparent in both the local interstellar magnetic field and the distribution of nearby interstellar material. The properties of these subshells are compared to optical polarization data that trace the nearby interstellar magnetic field (ISMF), and the distribution of interstellar FeII and CaII within about 55 pc of the Sun. The result is that a model of Loop I as composed of two magnetic subshells is a viable description of the distribution of nearby low density ISM. Column densities of the recombinant ion CaII are found to increase with the strength of the interstellar radiation field, rather than with star distance or total pathlength through the two magnetic subshells. As found earlier, the symmetry of the dipole moment of the cosmic microwave background corresponds to the symmetries of the heliosphere and local ISMF (to within 10 degrees).

References in corpus (9)

• Debris Disk Evolution Around A Stars
• The search for the origin of the Local Bubble redivivus
• A New Model For The Loop-I (The North Polar Spur) Region
• The Boundary Conditions of the Heliosphere: Photoionization Models Constrained by Interstellar and In Situ Data
• Probing Heliospheric Asymmetries with an MHD-kinetic Model
• The Orientation of the Local Interstellar Magnetic Field
• A Cold Nearby Cloud Inside the Local Bubble
• The Local Bubble and Interstellar Material Near the Sun
• The Sun's Journey Through the Local Interstellar Medium: The PaleoLISM and Paleoheliosphere

Cited by in corpus (10)

• Anisotropy of TeV Cosmic Rays and the Outer Heliospheric Boundaries
• The Interstellar Magnetic Field Close to the Sun II
• Charting the Interstellar Magnetic Field causing the Interstellar Boundary Explorer (IBEX) Ribbon of Energetic Neutral Atoms
• Optical Polarization Mapping toward the interface between the Local Cavity and Loop I
• Comparisons of the Interstellar Magnetic Field Directions obtained from the IBEX Ribbon and Interstellar Polarizations
• Can IBEX Identify Variations in the Galactic Environment of the Sun using Energetic Neutral Atom (ENAs)?
• Time-variability in the Interstellar Boundary Conditions of the Heliosphere: Effect of the Solar Journey on the Galactic Cosmic Ray Flux at Earth
• The Interstellar Boundary Explorer (IBEX): Tracing the Interaction between the Heliosphere and Surrounding Interstellar Material with Energetic Neutral Atoms
• The Origin of the Cluster of Local Interstellar Clouds
• Connecting the interstellar magnetic field at the heliosphere to the Loop I superbubble