Temporal evolution of sky polarization during solar eclipse totality

Shaw, Joseph A.; Eshelman, Laura M.; Tauc, Martin Jan; Shaw, Glenn E.

doi:10.1117/12.2531269

Cited by 5 publications

(12 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In Tab. 1 we also compare the sky polarization sampled at ∼5 • next to the Sun with the all-sky observations presented by [15,16]. From the telescopic observations in [1] it is impossible to derive the sky polarization far away enough from the Sun such that the corona does not dominate the signal.…”

Section: Resultsmentioning

confidence: 99%

“…1 we list the measured degree of linear polarization at the position of the Sun (DoLP( )), and measured at ∆(az,alt) [-4 • ,3 • ] next to the Sun as defined in Fig. 2, and compare with the co-located all-sky observations presented in [15,16], and the telescopic observations of [1] from Madras, OR. As is readily visible in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Our observations were recorded at the BYU-Idaho Physics Department astronomical observatory near Rexburg, ID (USA) located at 43 • 49'45.5" N, 111 • 53'06.7" W. Totality occured from 18:33:14 UTC to 18:35:31 UTC (11:33:14-11:35:31 local time). This experiment was co-located with the all-sky observations described in [15,16]. During totality, the sky was completely free of clouds, with temperatures around 17.1-17.6 • C. Even though wildfires were rampant throughout the area in the preceding days, no clouds of smoke were reported on the day of the eclipse.…”

Section: B Location and Conditionsmentioning

confidence: 95%

“…These cameras carry 20.2 (effective) megapixels, each consisting of a 2×2 RGBG Bayer pattern. We equipped the cameras with Canon EF 75-300mm F4.0-5.6 lenses to cover a middle ground between the fisheye lenses of the co-located experiments described in [15,16] and telescopic observations. We have locked the lenses at ∼200 mm (at F/5.7) to obtain a field-of-view of ∼10×7 • .…”

Section: A Instrumentmentioning

confidence: 99%

“…This implies that the sky polarization pattern during totality is completely different from regular sky polarization. Along the path of totality a polarization neutral point is observed near zenith [11][12][13][14][15][16]. When the Sun/Moon themselves are not near zenith, this neutral points acts as a singularity of index + 1 2 [7] for the surrounding sky polarization, i.e.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Detection of polarization neutral points in observations of the combined corona and sky during the 21 August 2017 total solar eclipse

et al. 2020

Self Cite

View full text Add to dashboard Cite

We report the results of polarimetric observations of the total solar eclipse of Aug. 21 2017 from Rexburg, ID (USA). We use three synchronized DSLR cameras with polarization filters oriented at 0, 60 and 120 degrees to provide high-dynamic-range RGB polarization images of the corona and surrounding sky. We measure tangential coronal polarization and vertical sky polarization, both as expected. These observations provide detailed detections of polarization neutral points above and below the eclipsed Sun where the coronal polarization is cancelled by the sky polarization. We name these special polarization neutral points after Minnaert and Van de Hulst.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: B Location and Conditionsmentioning

confidence: 95%

Section: A Instrumentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Detection of polarization neutral points in observations of the combined corona and sky during the 21 August 2017 total solar eclipse

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

Polarization of the Corona Observed During the 2017 and 2019 Total Solar Eclipses

Hanaoka

Sakai²,

Takahashi

2021

Sol Phys

View full text Add to dashboard Cite

Imaging Polarimetry of the 2017 Solar Eclipse with the RIT Polarization Imaging Camera

Vorobiev

Ninkov

Bernard

et al. 2020

PASP

View full text Add to dashboard Cite

In the last decade, imaging polarimeters based on micropolarizer arrays have been developed for use in terrestrial remote sensing and metrology applications. Micropolarizer-based sensors are dramatically smaller and more mechanically robust than other polarimeters with similar spectral response and snapshot capability.To determine the suitability of these new polarimeters for astronomical applications, we developed the RIT Polarization Imaging Camera to investigate the performance of these devices, with a special attention to the low signal-to-noise regime. We characterized the device performance in the lab, by determining the relative throughput, efficiency, and orientation of every pixel, as a function of wavelength. Using the resulting pixel response model, we developed demodulation procedures for aperture photometry and imaging polarimetry observing modes. We found that, using the current calibration, RITPIC is capable of detecting polarization signals as small as ∼ 0.3%. To demonstrate the stability of RITPIC's calibration and its extreme portability, we performed imaging polarimetry of the Solar corona in Madras, Oregon during the total Solar eclipse of 2017. The maximum polarization we measured was ∼ 46%, which agrees well with the maximum value predicted for a Thomson scattering corona. Similarly, we found no strong deviations in the angle of linear polarization from the tangential direction. The relative ease of data collection, calibration, and analysis provided by these sensors suggest than they may become an important tool for a number of astronomical targets.Corresponding author: Dmitry Vorobiev 2 Vorobiev et al.

show abstract

Temporal evolution of sky polarization during solar eclipse totality

Cited by 5 publications

References 22 publications

Detection of polarization neutral points in observations of the combined corona and sky during the 21 August 2017 total solar eclipse

Detection of polarization neutral points in observations of the combined corona and sky during the 21 August 2017 total solar eclipse

Polarization of the Corona Observed During the 2017 and 2019 Total Solar Eclipses

Imaging Polarimetry of the 2017 Solar Eclipse with the RIT Polarization Imaging Camera

Contact Info

Product

Resources

About