日珥精細結構的IRIS衛(wèi)星紫外光譜觀測研究
發(fā)布時間:2018-11-04 14:14
【摘要】:日珥是太陽大氣中的重要特征物,其形成與演化一直是太陽物理研究的重要課題。日珥的形態(tài)各異,其拓撲形狀與日珥磁場位形及其形成機制有密切關系。日珥通常是由精細的細絲狀等離子體結構組成的。這些細絲結構體現(xiàn)了日珥的磁場位形,因此是我們認識日珥磁場位形的重要途徑。IRIS衛(wèi)星的成像和光譜觀測具有很高的空間和時間分辨率,為我們研究日珥的精細結構提供極佳的手段。本研究工作主要利用IRIS衛(wèi)星的成像和光譜儀器,分析細絲狀結構、垂向流動和小尺度等離子體團等日珥精細結構的幾何信息和等離子體流動信息。在這個工作中,我們分析了兩個寧靜區(qū)日珥和一個中間區(qū)日珥。我們發(fā)現(xiàn),在IRIS的數據分辨率下,細絲的寬度為0.5"-1",與之前Hα以及SOT Ca Ⅱ的觀測結果相同。結合成像和光譜數據我們辨認了這些日珥中數條精細細絲結構,它們在成像觀測中均表現(xiàn)為垂直于日面,即以往定義下的垂直細絲。通過分析它們的成像和光譜觀測數據,我們得到不同的細絲的天空平面速度分布在10km/s-45km/s之間,多普勒速度分布在10km/s-49km/s之間。結合多普勒速度和天空平面速度,我們推測出了這些細絲與太陽表面在視線方向上的實際夾角。我們發(fā)現(xiàn)所謂的'垂直'細絲并不與太陽表面真的垂直,它們與太陽表面的夾角在30°-60°之間,與垂角偏離較大。通過分析細絲內各個位置與太陽表面的夾角,我們發(fā)現(xiàn)細絲并不是直的,而是彎曲的,細絲具有類似波浪狀結構。垂直細絲與水平細絲的拓撲形狀相似,垂直細絲和水平細絲的區(qū)別有可能是相對日珥的觀測角度導致的。我們認為,這些波浪形磁場拓撲提供了向上的磁張力,可以為日珥等離子體提供支撐。另一方面,在同一日珥中,通過光譜學診斷和成像跟蹤觀測,我們證實了日珥中存在方向相反的等離子體流動,證明了日珥內部等離子動力學的復雜性。我們在寧靜區(qū)日珥中發(fā)現(xiàn)了兩類可能的日珥物質流失的運動形式。一種是等離子體沿磁力線回落太陽表面;另外一種是從日珥無規(guī)則脫落的小尺度等離子體團。在其中一個寧靜區(qū)日珥的演化過程中,我們觀察到等離子體團從一側上升,在另外一側回落,且其中存在向上運動的氣泡結構,整個演化過程,與日珥的磁熱對流形成機制相符。通過對這些精細結構的研究,我們對日珥的幾何結構、磁場位形和其中的磁流體力學特征有了深入的認識,為將來進一步利用多波段成像和光譜觀測研究日珥演化的物理過程提供了重要的線索。
[Abstract]:Prominence is an important characteristic of the solar atmosphere, its formation and evolution has been an important subject in the study of solar physics. The shape of prominence is different, and its topological shape is closely related to the configuration of magnetic field of prominence and its formation mechanism. Prominence usually consists of fine filamentous plasma structures. These filaments reflect the magnetic field configuration of prominence, so it is an important way to understand the magnetic field configuration of prominence. The imaging and spectral observation of IRIS satellite have high spatial and temporal resolution. It is an excellent tool for us to study the fine structure of prominence. In this work, the geometric information and plasma flow information of fine structures such as filaments, vertical flow and small scale plasma clusters are analyzed by IRIS satellite imaging and spectrometer. In this work, we analyzed two quiet areas of prominence and an intermediate region of prominence. We find that the width of filaments is 0.5 "-1" at the resolution of IRIS data, which is the same as that of H 偽 and SOT Ca 鈪,
本文編號:2310059
[Abstract]:Prominence is an important characteristic of the solar atmosphere, its formation and evolution has been an important subject in the study of solar physics. The shape of prominence is different, and its topological shape is closely related to the configuration of magnetic field of prominence and its formation mechanism. Prominence usually consists of fine filamentous plasma structures. These filaments reflect the magnetic field configuration of prominence, so it is an important way to understand the magnetic field configuration of prominence. The imaging and spectral observation of IRIS satellite have high spatial and temporal resolution. It is an excellent tool for us to study the fine structure of prominence. In this work, the geometric information and plasma flow information of fine structures such as filaments, vertical flow and small scale plasma clusters are analyzed by IRIS satellite imaging and spectrometer. In this work, we analyzed two quiet areas of prominence and an intermediate region of prominence. We find that the width of filaments is 0.5 "-1" at the resolution of IRIS data, which is the same as that of H 偽 and SOT Ca 鈪,
本文編號:2310059
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