- Access by Xinjiang University
The Sun's Radial Magnetic Gradient and Atmosphere
Phys. Rev. 33, 614 – Published 1 April, 1929
DOI: https://doi.org/10.1103/PhysRev.33.614
Abstract
Theory of the radial magnetic gradient of the sun based on the diamagnetic effect produced by ions spiralling about the impressed magnetic field.—The thermal ionization of the sun's atmosphere, free paths and velocities of thermal agitation of the molecules and ions all have such values that the diamagnetic effect is very large in the regions of the sun's atmosphere where abnomally large magnetic gradients are observed. Extrapolation of the diamagnetic effect into regions where there are no available experimental data shows that the magnetic field at the surface of the sun is several times the generally accepted value.
Ionic densities estimated from magnetic data.—These agree well with data from other sources. The mean atomic weight of the particles in the sun's atmosphere assuming it to be in purely gravitational equilibrium is found to be approximately 3.3 or when a correction is made for the presence of an electric charge on the sun this becomes 5.5.
References (10)
- Hale, Astrophys. J. 38, 31 (1913) Hale, Seares, van Maanen and Ellerman, 47, 1 (1918)
- Gunn, Phys. Rev. 32, 133 (1928)
- Gunn, Note on the radial magnetic gradient of the sun, Science, p. 273 (Sept. 21, 1928)
- Saha, Phil. Mag. 40, 472 (1920)
- A. Pannekoek, Astro. Inst. Netherlands, No. 19 (1922)
- St. John and Babcock, Astrophys. J. 60, 323 (1924)
- Russell, Astrophys. J. 55, 135 (1922)
- Stewart, Phys. Rev. 22, 324 (1923)
- Fowler and Milne, Royal Astron. Soc. Monthly Notices, 83, 402 (1923)
- S. Chapman, Monthly Notices. Roy. Astro. Soc., Nov., 1928