从活动区外围发出的二十个喷流的多波长研究
Multiwavelength study of twenty jets emanating from the periphery of active regions
摘要：
我们提出了一个多波长分析的20 EUV射流发生在活动区的外围靠近太阳黑子。我们讨论的喷流的物理参数和它们与其他现象，如H α浪涌，非热III型射电爆发和硬X射线发射的关系。利用对日冕温度敏感的AIA波长通道，利用视线差分辐射测量技术研究了喷流中的温度分布。我们还研究了光球磁场的作用，使用从HMI的LOS磁图数据。喷流的寿命从5分钟到39分钟不等，平均为18分钟，速度从87公里/秒到532公里/秒不等，平均为271公里/秒。大多数喷流与风/波航天器观测到的非热III型射电爆发是同时的。我们使用位场源面技术确认了这些爆发的源区。在20次事件中，有10次发生在流量抵消区，6次发生在流量出现区。4次事件在喷流演化过程中表现出通量的出现和消失。DEM分析表明，对于大多数的螺旋射流，DEM的峰值在log T [K] = 6.2/6.3左右。此外，我们还导出了在尖顶和足点处的电子密度的发射测度和下限。这些结果与先前通过研究单个活动区射流所获得的结果一致。通量抵消的观测，与HXR发射和发射的非热III型射电暴的关联，表明启动，因此，加热发生在基地的射流。这也支持的高温等离子体所揭示的DEM分析在射流足点。我们的研究结果提供了大量的约束条件的理论建模的射流和它们的热力学性质。
英文摘要：
We present a multiwavelength analysis of 20 EUV jets which occurred at the periphery of active regions close to sunspots. We discuss the physical parameters of the jets and their relation with other phenomena such as H alpha surges, nonthermal type III radio bursts and hard X-ray emission. Using AIA wavelength channels sensitive to coronal temperatures, we studied the temperature distribution in the jets using the line-of-sight Differential Emission Measure technique. We also investigated the role of the photospheric magnetic field using the LOS magnetogram data from the HMI. The lifetime of jets range from 5 to 39 minutes with an average of 18 minutes and their velocities range from 87 to 532 km/s with an average of 271 km/s. Most of the jets are co-temporal with nonthermal type III radio bursts observed by the Wind/WAVES spacecraft. We confirm the source region of these bursts using the Potential Field Source Surface technique. 10 out of 20 events showed that the jets originated in a region of flux cancellation and 6 jets in a region of flux emergence. 4 events showed flux emergence and then cancellation during the jet evolution. DEM analyses showed that for most of the spires of the jets, the DEM peaked at around log T [K] = 6.2/6.3. In addition, we derived an emission measure and a lower limit of electron density at the location of the spire and the footpoint. These results are in agreement with those obtained earlier by studying individual active region jets. The observation of flux cancellation, the association with HXR emission and emission of nonthermal type III radio bursts, suggest that the initiation and therefore, heating is taking place at the base of the jet. This is also supported by the high temperature plasma revealed by the DEM analysis in the jet footpoint. Our results provide substantial constraints for theoretical modeling of the jets and their thermodynamic nature.
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