Long-term variation of the solar polar magnetic fields at different latitudes
arXiv:2408.15168 · doi:10.1088/1674-4527/ad539a
Abstract
The polar magnetic fields of the Sun play an important role in governing solar activity and powering fast solar wind. However, because our view of the Sun is limited in the ecliptic plane, the polar regions remain largely uncharted. Using the high spatial resolution and polarimetric precision vector magnetograms observed by Hinode from 2012 to 2021, we investigate the long-term variation of the magnetic fields in polar caps at different latitudes. The Hinode magnetic measurements show that the polarity reversal processes in the north and south polar caps are non-simultaneous. The variation of the averaged radial magnetic flux density reveals that, in each polar cap, the polarity reversal is completed successively from the 70 degree latitude to the pole, reflecting a poleward magnetic flux migration therein. These results clarify the polar magnetic polarity reversal process at different latitudes.
1 table, 4 figures, published, 2024, Res. Astron. Astrophys., 24, 075015
References in corpus (6)
- The Solar Optical Telescope for the Hinode Mission: An Overview
- Magnetic Landscape of Sun's Polar Region
- On Polar Magnetic Field Reversal and Surface Flux Transport During Solar Cycle 24
- The usefulness of analytic response functions
- Evolution of the Sun's Polar-fields and the Poleward Transport of Remnant Magnetic Flux
- Photospheric Flow Field Related to the Evolution of the Sun's Polar Magnetic Patches Observed by Hinode SOT