Author(s): Jay M. Pasachoff13, Vojtech Rusin3, Roman Vanur3, Thanasis Economou9, Aristeidis Voulgaris6, John H Seiradakis1, Daniel Seaton8, Ronald Dantowitz5, Christian A. Lockwood13, Timothy Nagle-McNaughton13, Cielo Perez13, Erin N. Meadors13, Connor J. Marti13, Ross Yu13, Brendan Rosseau13, Charles A. Ide13, Declan M. Daly13, Allen Bradford Davis14, Muzhou Lu10, Amy Steele11, Duane Lee7, Marcus J. Freeman4, David Sliski12, Ana Rousseva2
Institution(s): 1. Aristotle U of Thessaloniki, 2. Arlington HS, 3. Astronomical Institute, Slovak Academy of Sciences, 4. Bowst, 5. Dexter Southfield School, 6. ICARUS Optomechanics, 7. MIT, 8. NOAA, 9. U. Chicago, 10. U. Colorado, 11. U. Maryland, 12. U. Penn, 13. Williams College, 14. Yale U.
Contributing team(s): Greek Salem (Oregon) Team: Aristeidis Voulgaris (ICARUS Optomechanics); John Hugh Seiradakis (Aristotle University of Thessaloniki, Greece); and Stavros Koukioglou, Nikos Kyriakou, and Anna Vasileiadou (Aristotle University of Thessaloniki). Greek Carbondale (Illinois) Team: Thanasis Economou (University of Chicago-Fermi Institute); Spyros Kanouras (DIOPSIS Consulting); Christina Irakleous, Adrianos Golemis, and Nikoleta Tsioumpanika (Association of Friends of Astronomy at Thessaloniki); Nikos Plexidas and Nikos Tzimkas (Astronomy Association of Western Macedonia ,Greece); and Ourania Kokkinidou (DIOPSIS Consulting).
We report on high-contrast data reduction of white-light images from the August 21, 2017, total solar eclipse. We show the configuration of the solar corona at this declining phase of the solar-activity cycle, with the projection onto the plane of the sky of the three-dimensional coronal streamers plus extensive polar plumes. We discuss the relation of the white-light coronal loops visible in our observations with extreme-ultraviolet observations from NASA۪s Solar Dynamics Observatory Atmospheric Imaging Assembly (AIA) and NOAA۪s GOES-16 Solar Ultraviolet Imager (SUVI). We show differences and motions over a 65-minute interval between observations from our main site at Willamette University in Salem, Oregon, and a subsidiary site in Carbondale, Illinois. We discuss, in particular, a giant demarcation about 1 solar radius outward in the southwest that crosses the radial streamers.
Our observations of the eclipse were sponsored in large part by the Committee for Research and Exploration of the National Geographic Society and by the Solar Terrestrial Program of the National Geographic Society. Additional support was received from the NASA Massachusetts Space Grant Consortium, the Sigma Xi honorary scientific society, the University of Pennsylvania (for DS), the Slovak Academy of Sciences VEGA project 2/0003/16, and the Freeman Foote Expeditionary and Brandi funds at Williams College. We thank Stephen Thorsett, Rick Watkins, and Honey Wilson of Willamette University for their hospitality. See http://totalsolareclipse.org or http://sites.williams.edu/eclipse/2017-usa/.