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Magnetic Field Dissipation in Dense Molecular Clouds |
| MAO Xin-jie;TONG Yi |
| Astronomy Department, Beijing Normal University, Beijing 100875 |
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| Cite this article: |
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MAO Xin-jie, TONG Yi 1998 Chin. Phys. Lett. 15 200-202 |
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Abstract In dense molecular clouds the grains become the main charged particles. When the hydrogen gas density reaches as high as nH = 1011cm-3 and the grains are assumed to be small polycyclic aromatic hydrocarbons(PAHs), the lower hybrid drift instability develops, leading to the creation of anomalous electric conductivity, which makes the magnetic Reynold's number of the system RM ~ 1 indicating the dissipation of magnetic fields. When the gas density continues to go up and over1011cm-3, the collision frequency between PAHs and gas particles becomes larger than the plasma frequency, resulting in the collision process being dominant. In that case the magnetic field also dissipates because RM ~ 1 is still kept.
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52.35.-g
97.10.Ld
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Published: 01 March 1998
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| PACS: |
52.35.-g
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(Waves, oscillations, and instabilities in plasmas and intense beams)
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97.10.Ld
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(Magnetic and electric fields; polarization of starlight)
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