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An explanation for time dependent variability of the solar dust ring
Authors:Syuzo Isobe  Ambadi Satheesh Kumar
Institution:(1) National Astronomical Observatory, 181 Mitaka, Tokyo, Japan;(2) Present address: Department of the Air Force, Wright Laboratory, Wright-Patterson Air Force Base, 45433-6563, Ohio, USA
Abstract:There are several observations showing an enhancement of infrared emission and optical polarization at a distance of 4R odot, (R odot is the angular radius of the Sun) implying a ring of dust in near-ecliptic orbit about the Sun; but there is an almost equal number of observations, which do not show any such enhancement. We plotted the observational results for the detection and the non-detection of the circum-solar dust on a diagram for the variation of the sun-spot number with time, and found that its detection and non-detection occurred near the solar minimum and maximum phases, respectively. We present the possibility that this phenomena is caused by an additional process, i.e., the Lorentz force acting on a charged dust particle. Since, at the maximum phase a dust particle in a near-solar region acquires a higher positive potential, and the solar magnetic field is very strong, the Lorentz force becomes dominant and can affect the orbit of the dust particle.
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