A model was proposed for corotating interaction regions of multispeed solar wind flows including a region with a reduced level of small-scale turbulence in front of the compressed part. This model is a development of the previously proposed model for the leading part of the interaction region. Dynamic two-dimensional maps of the distribution of the interplanetary scintillation level adapted to observations on the BSA LPI radio telescope have been calculated based on the model. As an example, an event related to a magnetic storm on April 16–17, 2024 was considered. A comparison of model calculations with observational data was carried out, which confirmed the previously made assumption that the scintillation attenuation at night before the arrival of a disturbance to the Earth is associated with an area of reduced small-scale turbulence. In general, the qualitative model calculations are in good agreement with the observational data.
V. R. Lukmanov (2025) studied this question.