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Solar wind streams, acting as background, govern the propagation of spaceweather drivers in the heliosphere, which induce geomagnetic storm activities.Therefore, predictions of the solar wind parameters are the core of spaceweather forecasts. This work presents an indigenous three-dimensional (3D)Solar Wind model (SWASTi-SW). This numerical framework for forecasting theambient solar wind is based on a well-established scheme that uses asemi-empirical coronal model and a physics-based inner heliospheric model. Thisstudy demonstrates a more generalized version of Wang-Sheeley-Arge (WSA)relation, which provides a speed profile input to the heliospheric domain.Line-of-sight observations of GONG and HMI magnetograms are used as inputs forthe coronal model, which in turn, provides the solar wind plasma properties at0.1 AU. These results are then used as an initial boundary condition for themagnetohydrodynamics (MHD) model of the inner heliosphere to compute the solarwind properties up to 2.1 AU. Along with the validation run for multipleCarrington rotations, the effect of variation of specific heat ratio and studyof stream interaction region (SIR) is also presented. This work showcases themulti-directional features of SIRs and provides synthetic measurements forpotential observations from the Solar Wind Ion Spectrometer (SWIS) subsystem ofAditya Solar wind Particle EXperiment (ASPEX) payload on-board ISRO's upcomingsolar mission Aditya-L1.

SWASTi-SW: Space Weather Adaptive SimulaTion framework for Solar Wind and its relevance to ADITYA-L1 mission