IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
artículos
Título:
Three-dimensional Tomographic Analysis of a High-Cadence LASCO-C2 Polarized Brightness Sequence
Autor/es:
RICHARD A. FRAZIN; ALBERTO M. VÁSQUEZ; FARZAD KAMALABADI; HYESUN PARK
Revista:
ASTROPHYSICAL JOURNAL
Editorial:
University of Chicago Press
Referencias:
Lugar: Austin, Texas-EEUU; Año: 2007 vol. 671 p. 201 - 204
ISSN:
0004-637X
Resumen:
We present the first 3D tomographic reconstructions of the coronal
electron density from an extended, high-cadence sequence of images of
the coronas polarized brightness (pB). While the standard LASCO
synoptic sequence is only 1 pB image per day, during the 14 day period
covering 2006 June 922, 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.