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High-resolution mid-infrared observations of astrospheres show that many ofthem have filamentary (cirrus-like) structure. Using numerical models of dustdynamics in astrospheres, we suggest that their filamentary structure might berelated to specific spatial distribution of the interstellar dust around thestars, caused by a gyrorotation of charged dust grains in the interstellarmagnetic filed. Our numerical model describes the dust dynamics in astrospheresunder an influence of the Lorentz force and assumption of a constant dustcharge. Calculations are performed for the dust grains with different sizesseparately. It is shown that non-monotonic spatial dust distribution (viewed asfilaments) appears for dust grains with the period of gyromotion comparablewith the characteristic time scale of the dust motion in the astrosphere.Numerical modelling demonstrates that number of filaments depends oncharge-to-mass ratio of dust.

Non-monotonic spatial distribution of the interstellar dust in astrospheres: finite gyroradius effect