The capability to predict the parameters of an SEP event such as its onset,peak flux, and duration is critical to assessing any potential space weatherimpact. We present a new flexible modelling system simulating the propagationof Solar Energetic Particles (SEPs) from locations near the Sun to any givenlocation in the heliosphere to forecast the SEP flux profiles. SPARX uses aninnovative methodology, that allows implementation within an operationalframework, to overcome the time constraints of test particle modelling of SEPprofiles, allowing the production of near real time SEP nowcasts and forecasts,when paired with appropriate near real time triggers. SPARX has the capabilityto produce SEP forecasts within minutes of being triggered by observations of asolar eruptive event. The model is based on the test particle approach and isspatially 3D, thus allowing for the possibility of transport in the directionperpendicular to the magnetic field. The model naturally includes the effectsof perpendicular propagation due to drifts and drift-induced deceleration. Themodelling framework and the way in which parameters of relevance for SpaceWeather forecasting are obtained are described. The first results from themodelling system are presented. These results demonstrate that corotation anddrift of SEP streams play an important role in shaping SEP flux profiles.
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