An explanation for time dependent variability of the solar dust ring

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Cosmic Dust, Infrared Radiation, Optical Polarization, Solar Interior, Solar Radiation, Lorentz Force, Time Dependence, Variability

Scientific paper

There are several observations showing an enhancement of infrared emission and optical polarization at a distance of 4 solar radii, 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 nondetection of the circumsolar dust on a diagram for the variation of the sunspot number with time, and found that its detection and nondetection occurred near the solar minimum and maximum phases, respectively. We present the possibility that this phenomenon 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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