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
Autores principales:	Frazin, R.A., Vásquez, A.M., Kamalabadi, F., Park, H.
Formato:	JOUR
Materias:	Sun: Corona Techniques: Image processing
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_0004637X_v671_n2PART2_pL201_Frazin
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_0004637X_v671_n2PART2_pL201_Frazin
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spelling	todo:paper_0004637X_v671_n2PART2_pL201_Frazin2023-10-03T14:02:06Z Three-dimensional tomographic analysis of a high-cadence LASCO-C2 polarized brightness sequence Frazin, R.A. Vásquez, A.M. Kamalabadi, F. Park, H. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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 Frazin, R.A. Vásquez, A.M. Kamalabadi, F. Park, H. 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.
format	JOUR
author	Frazin, R.A. Vásquez, A.M. Kamalabadi, F. Park, H.
author_facet	Frazin, R.A. Vásquez, A.M. Kamalabadi, F. Park, H.
author_sort	Frazin, R.A.
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
url	http://hdl.handle.net/20.500.12110/paper_0004637X_v671_n2PART2_pL201_Frazin
work_keys_str_mv	AT frazinra threedimensionaltomographicanalysisofahighcadencelascoc2polarizedbrightnesssequence AT vasquezam threedimensionaltomographicanalysisofahighcadencelascoc2polarizedbrightnesssequence AT kamalabadif threedimensionaltomographicanalysisofahighcadencelascoc2polarizedbrightnesssequence AT parkh threedimensionaltomographicanalysisofahighcadencelascoc2polarizedbrightnesssequence
_version_	1807321781240856576

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

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