Interplanetary scintillation observation and space weather modelling

Interplanetary scintillation (IPS) refers to random fluctuations in radio intensity of distant small-diameter celestial object, over time periods the order 1 s. The scattering and emergent waves are ascribed turbulent density irregularities transported by ubiquitous solar wind streams. spatial correlation length Fresnel radius diffraction two key parameters determining pattern. Such a pattern can be measured correlated between multi-station telescopes on Earth. Using “phase-changing screen” scenario based Born approximation, bulk-flow speed spectrum streams extracted from single-station power spectra fitting cross-correlation analysis. Moreover, numerical computer-assisted tomography (CAT) model, iteratively fit large number IPS measurements one Carrington rotation, used reconstruct global velocity structures inner heliosphere for purpose space weather modelling prediction. In this review, we interpret underlying physics governing phenomenon caused turbulence, describe cross signals, highlight application IPS-CAT models, emphasize significant benefits international cooperation within Worldwide Stations (WIPSS) network.