Improvement to Ooty IPS Velocity Maps for Time-Dependent MHD Simulation

Abstract:

Interplanetary Scintillation (IPS) observations can provide information
on the three-dimensional (3-D) solar wind structure. Manoharan et al.
(2015) have recently used IPS velocity data from the Ootacommad Radio
Telescope in India directly as time-dependent boundary conditions to
drive a 3-D heliospheric MHD model. Their results showed consistently
larger velocities at Earth compared to in situ data, most likely due to
the assumptions of constant velocity when the IPS velocity data in 3-D
space are mapped onto the boundary surface. Thus, we improve upon
their results by assuming non-constant velocity when we construct the
boundary velocity maps. New boundary conditions are then used to perform solar
wind propagation outward from the Sun.