日珥精細(xì)結(jié)構(gòu)的IRIS衛(wèi)星紫外光譜觀測研究
發(fā)布時(shí)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?fù)湫螤钆c日珥磁場位形及其形成機(jī)制有密切關(guān)系。日珥通常是由精細(xì)的細(xì)絲狀等離子體結(jié)構(gòu)組成的。這些細(xì)絲結(jié)構(gòu)體現(xiàn)了日珥的磁場位形,因此是我們認(rèn)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(shí)間分辨率,為我們研究日珥的精細(xì)結(jié)構(gòu)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(xì)絲狀結(jié)構(gòu)、垂向流動和小尺度等離子體團(tuán)等日珥精細(xì)結(jié)構(gòu)的幾何信息和等離子體流動信息。在這個(gè)工作中,我們分析了兩個(gè)寧靜區(qū)日珥和一個(gè)中間區(qū)日珥。我們發(fā)現(xiàn),在IRIS的數(shù)據(jù)分辨率下,細(xì)絲的寬度為0.5"-1",與之前Hα以及SOT Ca Ⅱ的觀測結(jié)果相同。結(jié)合成像和光譜數(shù)據(jù)我們辨認(rèn)了這些日珥中數(shù)條精細(xì)細(xì)絲結(jié)構(gòu),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(xì)絲。通過分析它們的成像和光譜觀測數(shù)據(jù),我們得到不同的細(xì)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(jié)合多普勒速度和天空平面速度,我們推測出了這些細(xì)絲與太陽表面在視線方向上的實(shí)際夾角。我們發(fā)現(xiàn)所謂的'垂直'細(xì)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(xì)絲內(nèi)各個(gè)位置與太陽表面的夾角,我們發(fā)現(xiàn)細(xì)絲并不是直的,而是彎曲的,細(xì)絲具有類似波浪狀結(jié)構(gòu)。垂直細(xì)絲與水平細(xì)絲的拓?fù)湫螤钕嗨?垂直細(xì)絲和水平細(xì)絲的區(qū)別有可能是相對日珥的觀測角度導(dǎo)致的。我們認(rèn)為,這些波浪形磁場拓?fù)涮峁┝讼蛏系拇艔埩?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(xué)診斷和成像跟蹤觀測,我們證實(shí)了日珥中存在方向相反的等離子體流動,證明了日珥內(nèi)部等離子動力學(xué)的復(fù)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(zhì)流失的運(yùn)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(tuán)。在其中一個(gè)寧靜區(qū)日珥的演化過程中,我們觀察到等離子體團(tuán)從一側(cè)上升,在另外一側(cè)回落,且其中存在向上運(yùn)動的氣泡結(jié)構(gòu),整個(gè)演化過程,與日珥的磁熱對流形成機(jī)制相符。通過對這些精細(xì)結(jié)構(gòu)的研究,我們對日珥的幾何結(jié)構(gòu)、磁場位形和其中的磁流體力學(xué)特征有了深入的認(rèn)識,為將來進(jìn)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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