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Accurate forecasting of the solar wind has grown in importance as societybecomes increasingly dependent on technology that is susceptible to spaceweather events. This work describes an inner boundary condition for ambientsolar wind models based on tomography maps of the coronal plasma density gainedfrom coronagraph observations, providing a novel alternative to magneticextrapolations. The tomographical density maps provide a direct constraint ofthe coronal structure at heliocentric distances of 4 to 8Rs, thus avoiding theneed to model the complex non-radial lower corona. An empirical inverserelationship converts densities to solar wind velocities which are used as aninner boundary condition by the Heliospheric Upwind Extrapolation (HUXt) modelto give ambient solar wind velocity at Earth. The dynamic time warping (DTW)algorithm is used to quantify the agreement between tomography/HUXt output andin situ data. An exhaustive search method is then used to adjust the lowerboundary velocity range in order to optimize the model. Early results show upto a 32% decrease in mean absolute error between the modelled and observedsolar wind velocities compared to that of the coupled MAS/HUXt model. The useof density maps gained from tomography as an inner boundary constraint is thusa valid alternative to coronal magnetic models, and offers a significantadvancement in the field given the availability of routine space-basedcoronagraph observations.

An inner boundary condition for solar wind models based on coronal density