Description
Abstract
Understanding the evolution of the solar wind, including solar large-scale structures such as interplanetary coronal mass ejections, stream interaction regions, and high-speed streams, requires tracking the solar plasma starting from its references and active regions on the solar surface through interplanetary space. Multi-spacecraft can introduce new thoughts about these features' radial magnetic field and plasma progress.
During 2022-2024, STEREO-A was close to the near-Earth position. Based on in-situ and remote sensing observations of the Solar Orbiter, WIND, and STEREO-A spacecraft, a tomography method is applied for two cases to plot tomography maps of coronal electron density at the height of 8 solar radii of calibrated STEREO A COR2 observations. By extrapolating to a coordinate at 8 solar radii, the spacecraft position would shift to increasing longitude, closer or beyond the interplanetary streamer boundary. The maps illustrate how the positions of these spacecraft, concerning interplanetary plasma stream boundaries, influence changes in the magnetic and plasma morphologies, even when spacecraft are near one another.
