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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 >OBSERVATIONS AND THEORY OF LONGITUDINAL WAVES IN CORONAL LOOPS
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OBSERVATIONS AND THEORY OF LONGITUDINAL WAVES IN CORONAL LOOPS

机译：冕环中的纵波的观测和理论

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High cadence TRACE observations show that outward propagating intensity disturbances are a common feature in large, quiescent coronal loops, close to active regions. An overview is given of measured parameters of such longitudinal oscillations in coronal loops. The observed oscillations are interpreted as propagating slow magnetoacoustic waves and are unlikely to be flare-driven. A basic magnetic field extrapolation is used to estimate the local geometry of the magnetic field. A theoretical model of slow magneto-acoustic waves, incorporating the effects of gravitational stratification, the magnetic field geometry, thermal conduction and compressive viscosity is presented to explain the very short observed damping lengths. The results of these numerical simulations are compared with the TRACE observations. Preliminary results indicate that the magnetic field geometry plays an important role.
机译：高节奏TRACE观测表明，向外传播的强度扰动是靠近活动区域的大型静态冕状环的共同特征。给出了在冠状环中这种纵向振荡的测量参数的概述。观察到的振荡被解释为正在传播的慢磁声波，并且不太可能由耀斑驱动。基本磁场外推法用于估计磁场的局部几何形状。提出了一个慢磁声波的理论模型，该模型结合了重力分层，磁场几何形状，热传导和压缩粘度的影响，以解释观察到的非常短的阻尼长度。将这些数值模拟的结果与TRACE观察结果进行比较。初步结果表明，磁场几何起着重要作用。

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