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Structure and Dynamics of the 2012 November 13/14 Eclipse White-light Corona

Pasachoff, J. M. and Rušin, V. and Saniga, M. and Babcock, B. A. and Lu, M. and Davis, A. B. and Dantowitz, R. and Gaintatzis, P. and Seiradakis, J. H. and Voulgaris, A. and Seaton, D. B. and Shiota, K. (2015) Structure and Dynamics of the 2012 November 13/14 Eclipse White-light Corona. Astrophysical Journal, 800 (2). Art. No. 90. ISSN 0004-637X. https://resolver.caltech.edu/CaltechAUTHORS:20150323-120711438

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Abstract

Continuing our series of observations of coronal motion and dynamics over the solar-activity cycle, we observed from sites in Queensland, Australia, during the 2012 November 13 (UT)/14 (local time) total solar eclipse. The corona took the low-ellipticity shape typical of solar maximum (flattening index ε = 0.01), a change from the composite coronal images we observed and analyzed in this journal and elsewhere for the 2006 and 2008-2010 eclipses. After crossing the northeast Australian coast, the path of totality was over the ocean, so further totality was seen only by shipborne observers. Our results include velocities of a coronal mass ejection (CME; during the 36 minutes of passage from the Queensland coast to a ship north of New Zealand, we measured 413 km s6(–1)) and we analyze its dynamics. We discuss the shapes and positions of several types of coronal features seen on our higher-resolution composite Queensland coronal images, including many helmet streamers, very faint bright and dark loops at the bases of helmet streamers, voids, and radially oriented thin streamers. We compare our eclipse observations with models of the magnetic field, confirming the validity of the predictions, and relate the eclipse phenomenology seen with the near-simultaneous images from NASA's Solar Dynamics Observatory (SDO/AIA), NASA's Extreme Ultraviolet Imager on Solar Terrestrial Relations Observatory, ESA/Royal Observatory of Belgium's Sun Watcher with Active Pixels and Image Processing (SWAP) on PROBA2, and Naval Research Laboratory's Large Angle and Spectrometric Coronagraph Experiment on ESA's Solar and Heliospheric Observatory. For example, the southeastern CME is related to the solar flare whose origin we trace with a SWAP series of images.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-637X/800/2/90DOIArticle
http://iopscience.iop.org/0004-637X/800/2/90/articlePublisherArticle
http://arxiv.org/abs/1412.1155arXivDiscussion Paper
ORCID:
AuthorORCID
Pasachoff, J. M.0000-0002-4372-4928
Additional Information:© 2015 American Astronomical Society. Received 2014 March 3; accepted 2014 November 8; published 2015 February 13. J.M.P.’s research on the annular and total solar eclipses of 2012 is supported in part by the Solar–Terrestrial Program of the Atmospheric and Geospace Sciences Division of the National Science Foundation through grant AGS–1047726. The 2012 expedition received additional support from the Brandi Fund, the Rob Spring Fund, the Milham Meteorology Fund, and Science Center funds from Williams College. The work of V.R. and M.S. was partially supported by the VEGA grant agency projects 2/0098/10 and 2/0003/13 (Slovak Academy of Sciences) and by NGS Grant 0139–12. For the Australian expedition, we thank Nikon Professional Services and Williams College’s Equipment Loan Office/James Lillie for providing equipment. We thank Wendy Carlos for her excellent computer work in providing a composite image of the overall coronal structure based on our imaging. J.M.P. thanks Andy Ingersoll and the Planetary Sciences Department of the California Institute of Technology for their hospitality during the period we composited images and completed the revision. Nicholas Weber of the Dexter Southfield School, Brookline, Massachusetts, was a full participant with the RED Epic cameras and other equipment on site. We also thank Alec Engell of Montana State University and Robert Lucas of the University of Sydney for their helpful participation on site. The assistance of Terry Cuttle of the Queensland Amateur Astronomers was invaluable for finding our sites. For the loan of tracking mounts, we thank Dr. Joe Brimacombe and Dr. Tim Carruthers of Cairns and Charles Frank of Adelaide. Support for D.B.S. and SWAP came from PRODEX grant No. C90345, managed by the European Space Agency in collaboration with the Belgian Federal Science Policy Office (BELSPO) in support of the PROBA2/SWAP mission, and from the European Union’s Seventh Framework Programme, Technological Development and Demonstration under grant agreement No. 218816—Project eHeroes (www.eheroes.eu). SWAP is a project of the Centre Spatial de Liège and the Royal Observatory of Belgium funded by the Belgian Federal Science Policy Office (BELSPO). We are grateful for the assistance of David Rust (JHU/APL). We thank Todd Hoeksema of Stanford Solar oservatories Group for providing the Carrington-cycle magnetic-field map. Finally, we are very grateful to Zuzana Kanuchova in Slovakia for help with obtaining and completing the final form of some of the figures. Facilities: PROBA2, SDO, SOHO, STEREO
Funders:
Funding AgencyGrant Number
NSFAGS–1047726
Brandi FundUNSPECIFIED
Rob Spring FundUNSPECIFIED
Milham Meteorology FundUNSPECIFIED
Williams College Science Center fundsUNSPECIFIED
Slovak Academy of SciencesVEGA 2/0098/10
Slovak Academy of SciencesVEGA 2/0003/13
NGS0139–12
PRODEXC90345
Belgian Federal Science Policy Office (BELSPO)UNSPECIFIED
European Union’s Seventh Framework Programme, Technological Development and Demonstration under grant agreement218816—Project
Subject Keywords:eclipses; Sun: chromosphere; Sun: corona; Sun: coronal mass ejections (CMEs); Sun: magnetic fields; Sun: UV radiation
Issue or Number:2
Record Number:CaltechAUTHORS:20150323-120711438
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150323-120711438
Official Citation:Structure and Dynamics of the 2012 November 13/14 Eclipse White-light Corona J. M. Pasachoff et al. 2015 ApJ 800 90
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55969
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:23 Mar 2015 19:42
Last Modified:09 Mar 2020 13:19

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