Authors: Lizet Casillas (UCLA), Marco Velli (UCLA), Victor Reville(IRAP) and Benjamin Lynch(UCLA)
The heliospheric current sheet (HCS) is the boundary between open magnetic field lines
of opposite polarity in the solar wind that are also rooted at the sun in regions of opposite
polarity. The HCS is often described to be a disk-like sheet that is 10,000 Km thick at 1 AU,
warped by the combined effects of the inclination of the magnetic equator on the sun, solar
rotation and solar wind expansion. It is usually assumed that the current sheet is unique and
somehow continuous, however, this depends, perhaps, on their being a magnetic dipole
component dominating the solar surface field. In the presence of a pure quadrupole, one
would expect, for example, two separate conical current sheets. Indeed, there has been
evidence of more than one current sheet emanating from the corona during solar maximum
from LASCO and STEREO observations. How the current sheet forms depends on the
energetics of the opening of closed loops by the expanding solar wind in the corona. Parker
Solar Probe (PSP) collects magnetic field data as it crosses the HCS intermittently on its
orbit. Through each PSP encounter, observations have introduced numerous interpretations
of the structure of the HSC. We examine the possible bifurcation of the current sheet and
asymmetries with a simple axially symmetric set of simulations using PLUTO code with a
superposed dipole and quadrupole. We also investigate how pseudo streamers generated
by the combination of quadruple and dipole might lead to greater open flux or greater
energization of the current sheet system.