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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Drag forces on interplanetary dust grains induced by the interstellar neutral gas
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Drag forces on interplanetary dust grains induced by the interstellar neutral gas

机译：星际中性气体对星际尘埃颗粒的拖曳力

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In the outer region of the heliosphere (> 20 AU) the neutral gas density becomes larger than the solar wind plasma density, which is inversely proportional to the square of the heliocentric distance. Thus the neutral gas drag may play an important role in the evolution of dust grains in this region. The effect is similar to the plasma Poynting-Robertson effect; the neutral hydrogen gas exerts a drag force on the dust particles. However, the monodirectional velocity of the interstellar gas, connected with the inflow direction of the interstellar material: induces an effect which is very much different from that induced by the radial solar wind velocity. This causes an asymmetric force acting on the dust particles, which forces the eccentricity and semimajor axis to change rapidly. As an effect of that the lifetime of dust grains in the Edgeworth-Kuiper Belt is not determined by the electromagnetic or plasma Poynting-Robertson lifetime but by the drag of the neutral gas leading to lifetimes of the order of half a million years for a 10-mu m-sized particle. [References: 47]
机译：在日光层的外部区域（> 20 AU），中性气体密度变得大于太阳风等离子体密度，该密度与日心距的平方成反比。因此，中性气体阻力可能在该区域中尘粒的演变中起重要作用。该效应类似于血浆Poynting-Robertson效应。中性氢气在灰尘颗粒上施加阻力。但是，星际气体的单向速度与星际物质的流入方向有关：所产生的效果与径向太阳风速所产生的效果大不相同。这会导致作用在灰尘颗粒上的不对称力，从而迫使偏心率和半长轴快速变化。因此，埃格沃思-库伊伯带的尘埃颗粒寿命不是由电磁或等离子珀因廷-罗伯逊寿命决定，而是由中性气体的拖曳力决定，其使用寿命为50万年-μm大小的颗粒。 [参考：47]

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