Pasachoff discussed the range of science carried out at eclipses ( Pasachoff, 2009a, b, 2017a, b, 2018a). We use photographic techniques upgraded from earlier drawings and paintings ( Pasachoff and Olson, 2014, 2015). We discussed dynamics in Pasachoff et al. Our observations follow earlier high-resolution imaging in streamers ( Pasachoff et al., 2007, 2009) and in polar plumes ( Pasachoff et al., 2008). The ellipticity is greater at solar minimum, and the flattening index in this 2017 eclipse, as well as those measured for the 20 eclipses, should give indications on the strength of the forthcoming cycle, which follows the declining peak of the recently past cycle and its two predecessors. We were particularly interested in the shape of the corona as part of a synoptic observation set that began early in the previous solar-activity cycle, and linking to older radial-filter observations by Newkirk and others (described with a full set of images in Golub and Pasachoff, 2010, 2014). We coordinated with colleagues 65 min farther along the path of totality, in southern Illinois, in order to be able to calculate velocities of changing coronal features. We took advantage of the unusual-for-us ground access by shipping a variety of telescopes, spectrographs, Lyot-type filters, cameras and telescope-mounts across the country by truck in addition to air shipping of international and other equipment. Our own expedition team included six scientists, 8 undergraduate students, 3 graduate students, and several collaborators at our main scientific site on the campus of Willamette University, Salem, Oregon. As a result, major campaigns of scientific research and of outreach were carried out. The total solar eclipse of August 21, 2017, was the first whose totality crossed only United States territory since the origin of the country, and the first to cross the Continental United States from coast to coast in 99 years. We also monitored the effect of the eclipse penumbra and umbra on the terrestrial atmosphere. Our instruments included refracting telescopes and telephoto lenses for use with CCD detectors and DSLR cameras, narrow-band filters at the wavelengths of coronal emission lines ( 530.3 nm and 637.4 nm), and spectrographs. We report on early results from a suite of instruments for imaging and spectra we deployed to Salem, Oregon, for 2 min of totality at the August 21, 2017, total solar eclipse. 8Enrico Fermi Institute, University of Chicago, Chicago, IL, United States.7Astronomical Institute, Slovak Academy of Sciences, Tatranská Lomnica, Slovakia.6Dexter Southfield School, Brookline, MA, United States.5Icarus Optomechanics, Thessaloniki, Greece.4Cooperative Institute for Research in Environmental Sciences, University of Colorado, NOAA National Centers for Environmental Information, Boulder, CO, United States.3Astronomy Department, Williams College, University of the Andes-Merida, Mérida, Venezuela.2Astronomy Department, Williams College, Williamstown, MA, United States.1Hopkins Observatory, Williams College, Williamstown, MA, United States.Seaton 4, Aris Voulgaris 5, Ron Dantowitz 6, Vojtech Rušin 7 and Thanasis Economou 8 ![]() Pasachoff 1 *, Christian Lockwood 2, Erin Meadors 2, Ross Yu 2, Cielo Perez 2, Marcos A.
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