Coronal Imaging Campaign with Solar UltraViolet Imager (SUVI)
Abstract
The details of a campaign to image the solar corona in extreme ultraviolet (EUV) wavelengths by the Solar UltraViolet Imager (SUVI) on Geostationary Operational Environmental Satellite-R (GOES-R) series spacecraft are presented. SUVI images the Sun in six EUV wavelengths: 94Å, 131Å, 171Å, 195Å, 284Å and 304Å. Mounted on a two axis gimballed Sun Pointed Platform (SPP), SUVI is nominally Sun-centered and provides high dynamic range images in all six wavelengths every four minutes.
SUVI data indicated sufficient dynamic range and sensitivity in the 171Å and 195Å wavelengths to image the corona to the largest heights above the Sun to date while simultaneously imaging the Sun. We conducted a series of tests to assess the performance of SUVI as an EUV extremely wide-field coronal imager by off-pointing the SPP around the Sun and synthesizing an image that's about 4 times the diameter of the Sun. The coronal imaging at these two wavelengths was performed by off-pointing the SUVI boresight to a few locations around the Sun and generating a composite coronal image that extends to 4 solar radii. Various exposure durations and off-point patterns were considered and a composite coronal images were obtained. Three campaigns have been undertaken and each time the parameters were refined for the subsequent trials. The routine use of an ultraviolet solar imager as both an imager and a EUV coronagraph would be the first of its kind and is an exciting development. The on-orbit solar coronagraphs to date provide white light images with fields of view extending from 4-15 solar radii. Earlier, Seaton, et al investigated the evolution of the corona in EUV near the solar surface with the data from the Sun Watcher with Active Pixels and Image Processing (SWAP) EUV solar telescope on board the Project for On-Board Autonomy 2 (PROBA2).The presence of corona in EUV even to 4 solar radii is not known. The results of these experiments will begin to fill this void.- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFMSH34A..09T
- Keywords:
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- 7509 Corona;
- SOLAR PHYSICS;
- ASTROPHYSICS;
- AND ASTRONOMYDE: 7549 Ultraviolet emissions;
- SOLAR PHYSICS;
- ASTROPHYSICS;
- AND ASTRONOMYDE: 7594 Instruments and techniques;
- SOLAR PHYSICS;
- ASTROPHYSICS;
- AND ASTRONOMY