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Abstract:

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.

Registro:

Documento: Artículo
Título:Three-dimensional tomographic analysis of a high-cadence LASCO-C2 polarized brightness sequence
Autor:Frazin, R.A.; Vásquez, A.M.; Kamalabadi, F.; Park, H.
Filiación:Department of Ocean, Atmospheric, and Space Science, University of Michigan, Ann Arbor, MI 48109, United States
Instituto de Astronomía y Física del Espacio, CONICET, University of Buenos Aires, Argentina
Department of Electrical, and Computer Engineering, University of Illinois, Urbana, IL 61801, United States
Palabras clave:Sun: Corona; Techniques: Image processing
Año:2007
Volumen:671
Número:2 PART 2
Página de inicio:L201
Página de fin:L204
DOI: http://dx.doi.org/10.1086/525017
Título revista:Astrophysical Journal
Título revista abreviado:Astrophys. J.
ISSN:0004637X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v671_n2PART2_pL201_Frazin

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Citas:

---------- APA ----------
Frazin, R.A., Vásquez, A.M., Kamalabadi, F. & Park, H. (2007) . Three-dimensional tomographic analysis of a high-cadence LASCO-C2 polarized brightness sequence. Astrophysical Journal, 671(2 PART 2), L201-L204.
http://dx.doi.org/10.1086/525017
---------- CHICAGO ----------
Frazin, R.A., Vásquez, A.M., Kamalabadi, F., Park, H. "Three-dimensional tomographic analysis of a high-cadence LASCO-C2 polarized brightness sequence" . Astrophysical Journal 671, no. 2 PART 2 (2007) : L201-L204.
http://dx.doi.org/10.1086/525017
---------- MLA ----------
Frazin, R.A., Vásquez, A.M., Kamalabadi, F., Park, H. "Three-dimensional tomographic analysis of a high-cadence LASCO-C2 polarized brightness sequence" . Astrophysical Journal, vol. 671, no. 2 PART 2, 2007, pp. L201-L204.
http://dx.doi.org/10.1086/525017
---------- VANCOUVER ----------
Frazin, R.A., Vásquez, A.M., Kamalabadi, F., Park, H. Three-dimensional tomographic analysis of a high-cadence LASCO-C2 polarized brightness sequence. Astrophys. J. 2007;671(2 PART 2):L201-L204.
http://dx.doi.org/10.1086/525017