Observations of the solar corona during the total solar eclipse on 21 August 2017

Qu, Zhongquan; Chen, Yajie; Deng, Linhua; Huang, Zhaoqin; Li, Hao; Zhong, Yue; Liang, Yu; Zhang, Jingwen; Zhang, Yi-Gong; Lun, Bao-Li; Cheng, Xiaojin; Yan, Xiaoli; Xue, Z.; Xin, Yuxin; Song, Zhiming; Zhu, Yafen; Samanta, Tanmoy

doi:10.26464/epp2017010

Cited by 5 publications

(3 citation statements)

References 20 publications

(20 reference statements)

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“…shows a stacked image of the white-light corona as processed by Roman Vanúr from the 800 mm telephoto lens, using 85 individual pictures of different exposures from 2 to 1/500 s. To show higher contrast that reveals the structure of the underlying magnetic field, we used an especially-high-frequency filter. Tian et al (2017) and Chen et al (2018) have described the coronal configuration and a coronal cavity over a prominence region, which also shows on our images. Hanaoka et al (2018) have described changes over an expanse of umbral motion across the United States.…”

Section: Figuresupporting

confidence: 72%

Images and Spectra of the 2017 Total Solar Eclipse Corona From Our Oregon Site

Pasachoff

Lockwood

Meadors

et al. 2018

Front. Astron. Space Sci.

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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. 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 ([Fe XIV] 530.3 nm and [Fe X] 637.4 nm), and spectrographs. We also monitored the effect of the eclipse penumbra and umbra on the terrestrial atmosphere. 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. As a result, major campaigns of scientific research and of outreach were carried out.

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Section: Figuresupporting

confidence: 72%

Images and Spectra of the 2017 Total Solar Eclipse Corona From Our Oregon Site

Pasachoff

Lockwood

Meadors

et al. 2018

Front. Astron. Space Sci.

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“…The totality started at 17:16:57 UT and lasted for approximately 1 minute and 57 seconds at this site. A brief description of the telescopes and scientific objectives of this eclipse expedition team can be found in Tian et al (2017).…”

Section: Observations and Data Reductionmentioning

confidence: 99%

Diagnosing the Magnetic Field Structure of a Coronal Cavity Observed during the 2017 Total Solar Eclipse

Chen

et al. 2018

ApJ

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We present an investigation of a coronal cavity observed above the western limb in the coronal red line Fe X 6374Å using a telescope of Peking University and in the green line Fe XIV 5303Å using a telescope of Yunnan Observatories, Chinese Academy of Sciences during the total solar eclipse on 2017 August 21. A series of magnetic field models are constructed based on the magnetograms taken by the Helioseismic and Magnetic Imager onboard the Solar Dynamics Observatory (SDO) one week before the eclipse. The model field lines are then compared with coronal structures seen in images taken by the Atmospheric Imaging Assembly on board SDO and in our coronal red line images. The best-fit model consists of a flux rope with a twist angle of 3.1π, which is consistent with the most probable value of the total twist angle of interplanetary flux ropes observed at 1 AU. Linear polarization of the Fe XIII 10747Å line calculated from this model shows a "lagomorphic" signature that is also observed by the Coronal Multichannel Polarimeter of the High Altitude Observatory. We also find a ring-shaped structure in the line-of-sight velocity of Fe XIII 10747Å, which implies hot plasma flows along a helical magnetic field structure, in the cavity. These results suggest that the magnetic structure of the cavity is a highly twisted flux rope, which may erupt eventually. The temperature structure of the cavity has also been investigated using the intensity ratio of Fe XIII 10747Å and Fe X 6374Å.

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“…We provided articles summarizing the scientific value of eclipse research ( Peticolas et al 2018). We gathered summaries of recent eclipse results (Pasachoff et al 2018;Mikic et al 2018;Hanaoka et al 2018;Tian et al 2017) We provided a clearinghouse for methods of observation and data reduction (Druckmüller et al 2006, e.g. ).…”

Section: Recent Past and Near Future Eclipsesmentioning

confidence: 99%