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arXiv 0909.2115astro-ph.SR
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在Ca II 854.2 nm和H α谱线中的II型针状体的盘上对应物

On-disk counterparts of type II spicules in the Ca II 854.2 nm and Halpha lines

L. Rouppe van der Voort, J. Leenaarts, B. de Pontieu, M. Carlsson, G. Vissers

摘要:

最近,第二种类型的针状体被日本Hinode航天器上的太阳光学望远镜(SOT)在太阳边缘发现。这些先前未被识别的II型针状体是薄的色球喷流,寿命较短(10-60 s),并且表现出比经典针状体高得多的视向上速度(约50-100 km/s)。由于它们涉及向日冕环提供热等离子体,因此它们的形成、演化和性质是更好地了解低太阳大气质量和能量平衡的重要因素。在这里,我们报告的发现磁盘对应的II型针状体使用光谱成像数据在Ca II 854.2 nm和Halpha线与CRisp成像光谱偏振仪(CRISP)在瑞典太阳望远镜(SST)在拉帕尔马。我们发现快速的蓝向漂移的两个色球线,对应于薄,喷流状的功能,显示了50公里/秒的顺序的表观速度的线配置文件。这些向蓝的偏移似乎形成了一个单独的吸收分量,其多普勒频移分别为Ca II 854.2 nm和H α线的20和50 km/s量级。我们发现,这些快速的蓝色漂移盘上的外观,寿命,纵向和横向的速度和发生率是非常相似的II型骨针在肢体。在这些事件的谱线配置文件的详细研究表明,等离子体加速沿射流,等离子体被加热整个事件的短寿命。

英文摘要:

Recently a second type of spicules was discovered at the solar limb with the Solar Optical Telescope (SOT) onboard the Japanese Hinode spacecraft. These previously unrecognized type II spicules are thin chromospheric jets that are shorter-lived (10-60 s) and that show much higher apparent upward velocities (of order 50-100 km/s) than the classical spicules. Since they have been implicated in providing hot plasma to coronal loops, their formation, evolution and properties are important ingredients for a better understanding of the mass and energy balance of the low solar atmosphere. Here we report on the discovery of the disk counterparts of type II spicules using spectral imaging data in the Ca II 854.2 nm and Halpha lines with the CRisp Imaging SpectroPolarimeter (CRISP) at the Swedish Solar Telescope (SST) in La Palma. We find rapid blueward excursions in the line profiles of both chromospheric lines that correspond to thin, jet-like features that show apparent velocities of order 50 km/s. These blueward excursions seem to form a separate absorbing component with Doppler shifts of order 20 and 50 km/s for the Ca II 854.2 nm and Halpha line respectively. We show that the appearance, lifetimes, longitudinal and transverse velocities and occurrence rate of these rapid blue excursions on the disk are very similar to those of the type II spicules at the limb. A detailed study of the spectral line profiles in these events suggests that plasma is accelerated along the jet, and plasma is being heated throughout the short lifetime of the event.

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