Geliosphere - parallel CPU and GPU based models of cosmic ray modulation in the heliosphere

We present Geliosphere, a numerical model of the modulation of cosmic rays in the heliosphere. The current version of Geliosphere implements the stochastic differential equation method to solve Parker's equation. Sets of 1D and 2D models of Geliosphere solve Parker's equation in a backward-in-time manner for 2D models and in a backward-in-time and forward-in-time manner for 1D models. Geliosphere offers GPU-accelerated implementations of all models. Geliosphere also offers multithread CPU implementations of all available models for users who do not have access to GPUs. To verify the Geliosphere 2D model results at different heliospheric latitudes and radii, we show that the Geliosphere 2D model, with implemented heliospheric polar field modification, fits well with measurements provided by the Kiel Electron Telescope (KET), which is part of the Ulysses COsmic ray and Solar Particle INvestigation (COSPIN) experiment.