Observing the evolution of the Sun's global coronal magnetic field over 8 months

• 成果类型: Article
• 署名作者: Yang, Zihao; Tian, Hui; Tomczyk, Steven; Liu, Xianyu; Gibson, Sarah; Morton, Richard J.; Downs, Cooper
• 署名单位: Peking University; National Center Atmospheric Research (NCAR) - USA; Chinese Academy of Sciences; National Space Science Center, CAS; University of Michigan System; University of Michigan; Northumbria University; Predictive Science Inc.
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-13426
• DOI: 10.1126/science.ado2993
• 发表日期: 2024-10-04
• 页码: 76-82
• 关键词: transverse oscillations; emission; seismology; waves; modes; lines

摘要

The magnetic field in the Sun's corona stores energy that can be released to heat plasma and drive solar eruptions. Measurements of the global coronal magnetic field have been limited to several snapshots. In this work, we present observations, using the Upgraded Coronal Multi-channel Polarimeter, that provide 114 magnetograms of the global corona above the solar limb spanning similar to 8 months. We determined the magnetic field distribution with altitude in the corona and monitored the evolution at different latitudes over multiple solar rotations. The field strength between 1.05 and 1.60 solar radii varies from <1 to similar to 20 gauss. A signature of active longitudes appears in the coronal magnetic field measurements. Coronal models are generally consistent with our observations, though they have larger discrepancies in high-latitude regions.