Three-dimensional tomographic analysis of a high-cadence LASCO-C2 polarized brightness sequence

We present the first 3D tomographic reconstructions of the coronal electron density from an extended, highcadence sequence of images of the corona's polarized brightness (pB). While the standard LASCO synoptic sequence is only 1 pB image per day, during the 14 day period covering 2006 June 9-22...

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Detalles Bibliográficos
Publicado: 2007
Materias:
Sun: Corona
Techniques: Image processing
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v671_n2PART2_pL201_Frazin
http://hdl.handle.net/20.500.12110/paper_0004637X_v671_n2PART2_pL201_Frazin
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_0004637X_v671_n2PART2_pL201_Frazin
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spelling paper:paper_0004637X_v671_n2PART2_pL201_Frazin2023-06-08T14:28:54Z Three-dimensional tomographic analysis of a high-cadence LASCO-C2 polarized brightness sequence Sun: Corona Techniques: Image processing We present the first 3D tomographic reconstructions of the coronal electron density from an extended, highcadence sequence of images of the corona's polarized brightness (pB). While the standard LASCO synoptic sequence is only 1 pB image per day, during the 14 day period covering 2006 June 9-22, the C2 coronagraph took about 6.5 pB images per day. We show that the high cadence dramatically improves the quality of the tomographic reconstructions when compared to a reconstruction that only uses one image per day. In particular, the reconstruction that uses only one image per day misses important features and has lower spatial resolution. We find that the spatial resolution of the tomographic inversion is ultimately limited by smearing due to coronal dynamics that take place during the 14 days required for data acquisition. We show that when only C2 images are available, about 4 pB images per day are enough for nearly optimal tomographic reconstruction, but more will be required when STEREO observations are included in the tomographic analysis. © 2007. The American Astronomical Society, All rights reserved. 2007 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v671_n2PART2_pL201_Frazin http://hdl.handle.net/20.500.12110/paper_0004637X_v671_n2PART2_pL201_Frazin
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Sun: Corona
Techniques: Image processing
spellingShingle Sun: Corona
Techniques: Image processing
Three-dimensional tomographic analysis of a high-cadence LASCO-C2 polarized brightness sequence
topic_facet Sun: Corona
Techniques: Image processing
description We present the first 3D tomographic reconstructions of the coronal electron density from an extended, highcadence sequence of images of the corona's polarized brightness (pB). While the standard LASCO synoptic sequence is only 1 pB image per day, during the 14 day period covering 2006 June 9-22, the C2 coronagraph took about 6.5 pB images per day. We show that the high cadence dramatically improves the quality of the tomographic reconstructions when compared to a reconstruction that only uses one image per day. In particular, the reconstruction that uses only one image per day misses important features and has lower spatial resolution. We find that the spatial resolution of the tomographic inversion is ultimately limited by smearing due to coronal dynamics that take place during the 14 days required for data acquisition. We show that when only C2 images are available, about 4 pB images per day are enough for nearly optimal tomographic reconstruction, but more will be required when STEREO observations are included in the tomographic analysis. © 2007. The American Astronomical Society, All rights reserved.
title Three-dimensional tomographic analysis of a high-cadence LASCO-C2 polarized brightness sequence
title_short Three-dimensional tomographic analysis of a high-cadence LASCO-C2 polarized brightness sequence
title_full Three-dimensional tomographic analysis of a high-cadence LASCO-C2 polarized brightness sequence
title_fullStr Three-dimensional tomographic analysis of a high-cadence LASCO-C2 polarized brightness sequence
title_full_unstemmed Three-dimensional tomographic analysis of a high-cadence LASCO-C2 polarized brightness sequence
title_sort three-dimensional tomographic analysis of a high-cadence lasco-c2 polarized brightness sequence
publishDate 2007
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v671_n2PART2_pL201_Frazin
http://hdl.handle.net/20.500.12110/paper_0004637X_v671_n2PART2_pL201_Frazin
_version_ 1768541826249129984

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