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Study of the global coronal electron density and its evolution by tomography reconstructions from multiple vantage-point coronagraph observations

Presentation #401.05 in the session Connections Within Solar Physics.

Published onSep 18, 2023
Study of the global coronal electron density and its evolution by tomography reconstructions from multiple vantage-point coronagraph observations

Reliable reconstructions of the 3D coronal electron density distribution can provide unique insight into various important questions, e.g., how the density and structure vary with height from the low corona observed in the EUV to the extended inner corona seen in white light; what the relationship between magnetic and plasma structures is; how solar wind structures are linked to the low solar atmosphere. The global 3D coronal electron density also provides crucial constraints on inner boundary conditions for solar wind models. In this study, we apply a tomography technique to retrieve the 3D coronal electron density in the range of heights from 2.2 to 4 Solar radius from polarized brightness (pB) observations of STEREO/COR1-A, COR1-B, and LASCO/C2. When two STEREO spacecraft are separated with the Earth by about 60 degrees in November-December 2009 and by about 120 degrees in June-July 2012, the multiple vantage-point observations allow the tomographic reconstructions of global coronal electron density from the data covering a period as short as about 4-5 days compared to two weeks when only using a single satellite. Based on these density reconstructions, we analyze the short-term evolution of coronal structure in response to the magnetic evolution on the photosphere and compare their difference in dynamic features during solar minimum and solar maximum. These 3D density reconstructions can also be used to evaluate the various solar wind models and be potentially used to identify the pseudo-streamers.

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