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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Context. Systematic observations of magnetic field strength and polarity insunspots began at Mount Wilson Observatory (MWO), USA in early 1917. Except fora few brief interruptions, this historical dataset continues till present.Aims. The sunspot field strength and polarity observations are critical in ourproject of reconstructing the solar magnetic field over the last hundred years.Here we provide a detailed description of the newly digitized dataset ofdrawings of sunspot magnetic field observations. Methods. The digitization ofMWO drawings is based on a software package develope d by us. It includes asemi-automatic selection of solar limbs and other features of the drawing, anda manual entry of the time of observations, the measured field strength andother notes hand-written on each drawing. The data are preserved in a MySQLdatabase. Results. We provide a brief history of the project and describe theresults from digitizing this historical dataset. We also provide a summary ofthe final dataset, and describe its known limitations. Finally, we compare thesunspot magnetic field measurements with other instruments, and demonstratethat, if needed, the dataset could be continued using modern observations suchas, for example, Vector Stokes Magnetograph (VSM) on Synoptic Optical Long-termInvestigations of the Sun (SOLIS) platform.

Reconstructing solar magnetic fields from historical observations V. Sunspot magnetic field measurements at Mount Wilson Observatory