Are the Magnetic Fields Radial in the Solar Polar Region?
Abstract
We investigate the orientation of the photospheric magnetic fields in the solar polar region using observations from the Helioseismic and Magnetic Imager (HMI). Inside small patches of significant polarization, the inferred magnetic field vectors at 1″ scale appear to systematically deviate from the radial direction. Most tilt toward the pole; all are more inclined toward the plane of sky compared to the radial vector. These results, however, depend on the "filling factor" f that characterizes the unresolved magnetic structures. The default, uninformative f ≡ 1 for HMI will incur larger inclination and less radial fields than f < 1. The observed trend may be a systematic bias inherent to the limited resolution.
- Publication:
-
Research Notes of the American Astronomical Society
- Pub Date:
- June 2021
- DOI:
- 10.3847/2515-5172/ac072c
- arXiv:
- arXiv:2106.01461
- Bibcode:
- 2021RNAAS...5..134S
- Keywords:
-
- Solar magnetic fields;
- Solar photosphere;
- 1503;
- 1518;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 3 pages, 1 figure. Accepted for publication in RNAAS