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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present a dataset for investigating the impact of stellar activity onastrometric measurements using NASA's Solar Dynamics Observatory (SDO) imagesof the Sun. The sensitivity of astrometry for detecting exoplanets is limitedby stellar activity (e.g. starspots), which causes the measured "center offlux" of the star to deviate from the true, geometric, center, producing falsepositive detections. We analyze Helioseismic and Magnetic Imager continuumimage data obtained from SDO between July 2015 and December 2022 to examinethis "astrometric jitter" phenomenon for the Sun. We employ data processingprocedures to clean the images and compute the time series of thesunspot-induced shift between the center of flux and the geometric center. Theresulting time series show quasiperiodic variations up to 0.05% of the Sun'sradius at its rotation period.

A Dataset for Exploring Stellar Activity in Astrometric Measurements from SDO Images of the Sun