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arXiv 1908.11560astro-ph.SR
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模拟压力脉冲驱动的脉冲太阳喷流的运动学和演化特性

On modelling the kinematics and evolutionary properties of pressure pulse driven impulsive solar jets

Balveer Singh, Kushagra Sharma, Abhishek K. Srivastava

摘要:

本文利用Godunov型PLUTO程序对两种不同静太阳磁场强度(B=56,112 Gauss)下太阳大气中的脉冲冷喷流的运动学和演化特性进行了数值模拟。这些类型的色球喷流起源于压力脉冲,它模仿了太阳低层大气局部加热的后效。这些喷流可能负责局部高层大气中的质量和能量传输(即,corona)。通过施加不同的压力脉冲,对射流的高度-时间剖面的检测显示出非对称的近抛物线行为。这表明射流的向上运动是在压力扰动的影响下发生的。然而,它的向下运动不仅是由重力自由降落,而且由于其底部附近的对向传播脉冲的作用下的复杂的等离子体运动。喷嘴的最大高度和使用寿命。压力脉冲强度呈线性增加趋势。这表明,如果加热的程度,从而压力扰动将更长,那么更长的色球喷流可以从色球层中的同一位置触发。对于一定的压力脉冲幅值,强磁场(B=112高斯)比弱磁场(B=56高斯)产生更长的射流。这表明,强磁场引导压力脉冲驱动的射流更有效地朝向更高的电晕。总之,我们的模型模拟了色球层中各种冷脉冲喷流的性质和演化(例如,大针状体、网状喷流、孤立的重复冷喷流、受限的\&小浪涌等)。

英文摘要:

In this paper, we describe the kinematical and evolutionary properties of the impulsive cool jets in the solar atmosphere using numerical simulation by Godunov-type PLUTO code at two different strength of the quiet-Sun magnetic field (B=56, 112 Gauss). These types of chromospheric jets are originated by the pressure pulse, which mimics after effects of the localized heating in the lower solar atmosphere. These jets may be responsible for the transport of mass and energy in the localized upper atmosphere (i.e., corona). The detection of the height-time profiles for the jets, originated by imposing the different pressure pulses, exhibit the asymmetric near parabolic behaviour. This infers that the upward motion of the jet occurs under the influence of pressure perturbation. However, its downward motion is not only governed by the gravitational free fall, but also due to the complex plasma motions near its base under the effect of counter propagating pulses. Maximum height and life-time of the jets w.r.t. the strength of the pressure pulse show a linear increasing trend. This suggests that if the extent of the heating and thus pressure perturbations will be longer then more longer chromospheric jets can be triggered from the same location in the chromosphere. For the certain amplitude of pressure pulse, the strong magnetic field configuration (B=112 Gauss) leads more longer jet compared to the weaker field (B=56 Gauss). This suggests that the strong magnetic field guides the pressure pulse driven jets more efficiency towards the higher corona. In conclusion, our model mimics the properties and evolution of variety of the cool impulsive jets in the chromosphere (e.g., macrospicules, network jets, isolated repeated cool jets, confined \& small surges etc).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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