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首页> 外文会议>SOHO 13 - waves, oscillations and small-scale transients events in the solar atmosphere: a joint view from SOHO and TRACE >MODE CONVERSION OF SOLAR
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MODE CONVERSION OF SOLAR

机译：太阳能模式转换

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摘要

Sunspots absorb and scatter incident f- and p-modes.One suggested absorption mechanism is mode conversionto slow magnetoacoustic-gravity waves, which carrysome of the energy down magnetic field lines into the interior,or, less preferentially, up into the overlying atmosphere.Assuming uniform vertical magnetic field, thismechanism easily explains f-mode absorption, but cannotfully account for the observed absorption of p-modes,especially beyond the first few radial orders. Recently,we have calculated the efficiency of mode conversion inuniform non-vertical magnetic fields assuming two dimensionalpropagation, where the Alfv´en waves decouple.In moderately inclined field (20º-60º) at higherfrequencies (5-6mHz), we found significant absorptionenhancements - up to an order of magnitude. Usingthese two dimensional calculations, Cally, Crouch, andBraun constructed a simplified model for the interactionbetween a sunspot and its surroundings. They found excellentagreement with the observational p-mode absorptionand phase shift data. In this investigation, we determinethe efficiency of mode conversion in non-verticalmagnetic field with three dimensional propagation, wherefast and slow magnetoacoustic-gravity waves and Alfv´enwaves are all coupled.
机译：太阳黑子吸收并散射入射的f和p模式。一种建议的吸收机制是模式转换为慢磁声重力波，该电磁波将一些能量沿磁场线向下传播到内部，或者更不优选地传播到上覆大气中。均匀的垂直磁场，这种机制很容易解释了f模式的吸收，但是不能完全解释所观察到的p模式的吸收，尤其是超出最初的几个径向阶数时。最近，我们在二维传播的情况下，计算了Alfv'en波解耦的非均匀非垂直磁场模式转换的效率。在较高频率（5-6mHz）的中等倾斜磁场（20º-60º）中，我们发现了显着的吸收增强-达到一个数量级。利用这两个二维计算，Cally，Crouch和Braun为黑子与其周围环境之间的相互作用构建了一个简化模型。他们发现与观测的p型吸收和相移数据非常一致。在这项研究中，我们确定了在非垂直磁场中具有三维传播的模式转换效率，其中快，慢磁声重力波和Alfv´波都耦合在一起。

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