Mathematics – Logic
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002an....323..436i&link_type=abstract
Astronomische Nachrichten, vol. 323, no. 3/4, p. 436-440
Mathematics
Logic
1
Oblique Magnetic Rotator, Dynamo, Solar Cycle, Sunspots
Scientific paper
The current paradigm for the origin of sunspots and a global solar magnetic field is a dynamo, located near the bottom of the convection zone (CZ). We propose an alternative model. By interpolating in evolution between early-type stars and evolved white dwarfs and neutron stars, we suggest that the Sun (and indeed probably most stars) has a fossil magnetic field in the form of an oblique magnetic rotator (OMR) in the radiative zone (RZ). This rotator is electromagnetically screened by the skin-effect, produced by the differentially rotating CZ. The OMR provides a natural explanation for many solar phenomena, including the rigid rotation of the interior of the Sun, the long-term phase stability of the solar cycle, as well as diametrically opposing active longitudes. Nutation of the OMR can be invoked to explain the solar cycle and some of its features, including the sunspot butterfly diagram, Hale's law for the polarity of sunspots and their reversal every 11 years. An extension of the OMR model provides a natural explanation of the spatial and temporal variations of sunspots based on such a primordial magnetic field. Here, sunspots are bundles of magnetic flux that have broken off the extremities of the OMR. These rise by magnetic buoyancy and, on reaching the RZ-CZ boundary, suffer a deflection in a direction dependent upon the algebraic difference between the tangential zone velocities. This reverses during the nutation cycle and thus the leading and trailing sunspots reverse in magnetic polarity every 11 years. The flux fibrils, tubes, or possibly ropes, convey magnetic flux, energy, angular momentum, and, perhaps most importantly, frozen-in matter to the solar surface, each with a fingerprint characteristic of the radiative zone. More tentatively, the flux tubes may originate from even deeper within the Sun - the nuclear active zone (NZ). The resulting isotopic enhancements would have implications on abundance in the interstellar medium, and so on nucleosynthesis and its cosmological inferences.
Isaak George R.
Isaak Kate G.
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