Heliospheric Radio Diagnostics of the Background Solar Wind

Interplanetary scintillation (IPS) - the scintillation of a compact radio source due to density structure in the solar wind and CMEs - is one of the primary methods of remote observation of the solar wind and CMEs throughout the inner heliosphere. Many observations taken daily can be used to build a tomographic reconstruction of solar wind density and velocity for possible use in better constraining space weather model outputs. Single observations, taken over longer durations, can also be used to build up profiles of solar wind velocity and density structure passing across the line of sight. The sensitivity of the technique to small-scale structure is also useful in studies of turbulence. This ISWAT team has the following primary objectives: 1) Promote the incorporation of IPS solar wind data in space weather modelling, both as a useful complement and potential backup to spacecraft observations; 2) Investigate the benefits and pitfalls, and how to avoid them, of the use of IPS in this effort; 3) Investigate the evolution of solar wind structure, including co-rotating structures, stream interactions, and CMEs through the inner heliosphere. In this presentation, we will update the community on the on-going efforts to fulfill these objectives.