English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

A new instrument was designed to take visible-light (VL) polarized brightness($pB$) observations of the solar corona during the 14 December 2020 total solareclipse. The instrument, called the Coronal Imaging Polarizer (CIP), consistedof a 16 MP CMOS detector, a linear polarizer housed within a piezoelectricrotation mount, and an f-5.6, 200 mm DSLR lens. Observations were successfullyobtained, despite poor weather conditions, for five different exposure times(0.001 s, 0.01 s, 0.1 s, 1 s, and 3 s) at six different orientation angles ofthe linear polarizer (0\de, 30\de, 60\de, 90\de, 120\de, and 150\de). Theimages were manually aligned using the drift of background stars in the sky andimages of different exposure times were combined using a simple signal-to-noiseratio cut. The polarization and brightness of the local sky is also estimatedand the observations were subsequently corrected. The $pB$ of the K-corona wasdetermined using least squares fitting and radiometric calibration was donerelative to the Mauna Loa Solar Observatory (MLSO) K-Cor $pB$ observations fromthe day of the eclipse. The $pB$ data was then inverted to acquire the coronalelectron density, $n_e$, for an equatorial streamer and a polar coronal hole,which agreed very well with previous studies. The effect of changing the numberof polarizer angles used to compute the $pB$ is also discussed and it is foundthat the results vary by up to $\sim$ 13\% when using all six polarizer anglesversus only a select three angles.

Derived electron densities from linear polarization observations of the visible-light corona during the 14 December 2020 total solar eclipse