The active region source of a type III radio storm observed by Parker Solar Probe during encounter 2
The active region source of a type III radio storm observed by Parker Solar Probe during encounter 2
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帕克太阳探测器在遭遇2期间观测到的III型射电暴的活动区源
DOI：
10.1051/0004-6361/202039514
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发表时间：
2021
影响因子：
6.5
通讯作者：
M. Pulupa
中科院分区：
文献类型：
--
作者：
L. Harra;D. Brooks;S. Bale;C. Mandrini;Krzysztof Barczynski;R. Sharma;S. Badman;S. Vargas Domínguez;M. Pulupa
上下文我们调查了美国宇航局帕克太阳探测器（PSP）使命遭遇2期间III型射电暴的来源。
目标。据观察，在美国宇航局PSP使命的遭遇2中，有大量的无线电活动，特别是2019年3月31日至4月6日频繁的小型III型爆发的噪音风暴。我们的目标是调查这些小而频繁的爆发的来源。
方法.为了做到这一点，我们分析了来自Hinode EUV成像光谱仪，PSP FIELDS和太阳动力学天文台大气成像组件的数据。我们研究了活动区12737的行为，它的出现和演变与无线电噪声暴的时间相吻合，并确定了活动区内电子束的可能来源。为此，我们探测了动力学、多普勒速度、非热速度、FIP偏置和密度，并进行了磁性建模。
结果我们证明，虽然在光盘上的活动区产生没有显着的耀斑，其演变表明它是一个源的电子束引起的射电暴。它们最有可能起源于显示出强烈蓝移等离子体的活动区边缘的区域。我们证明，随着活动区域的增长和扩大，边缘蓝移区域的面积增加，这也与我们的模型中大规模或扩大的磁场线被锚定的面积增加一致。这种扩张在2019年4月1日至4日期间最为显着，恰逢III型风暴的爆发和单个爆发峰值频率的降低，这表明峰值辐射发射的高度随着活动区域的演变而增加。
Context. We investigated the source of a type III radio burst storm during encounter 2 of NASA’s Parker Solar Probe (PSP) mission.
Aims. It was observed that in encounter 2 of NASA’s PSP mission there was a large amount of radio activity and, in particular, a noise storm of frequent, small type III bursts from 31 March to 6 April 2019. Our aim is to investigate the source of these small and frequent bursts.
Methods. In order to do this, we analysed data from the Hinode EUV Imaging Spectrometer, PSP FIELDS, and the Solar Dynamics Observatory Atmospheric Imaging Assembly. We studied the behaviour of active region 12737, whose emergence and evolution coincides with the timing of the radio noise storm and determined the possible origins of the electron beams within the active region. To do this, we probed the dynamics, Doppler velocity, non-thermal velocity, FIP bias, and densities, and carried out magnetic modelling.
Results. We demonstrate that although the active region on the disc produces no significant flares, its evolution indicates it is a source of the electron beams causing the radio storm. They most likely originate from the area at the edge of the active region that shows strong blue-shifted plasma. We demonstrate that as the active region grows and expands, the area of the blue-shifted region at the edge increases, which is also consistent with the increasing area where large-scale or expanding magnetic field lines from our modelling are anchored. This expansion is most significant between 1 and 4 April 2019, coinciding with the onset of the type III storm and the decrease of the individual burst’s peak frequency, indicating that the height at which the peak radiation is emitted increases as the active region evolves.
影响因子：
6.5
作者：
Cattell C;Glesener L;Leiran B;Dombeck J;Goetz K;Martínez Oliveros JC;Badman ST;Pulupa M;Bale SD
通讯作者：
Bale SD
影响因子：
64.8
作者：
Kasper, J. C.;Bale, S. D.;Schwadron, N. A.
通讯作者：
Schwadron, N. A.
影响因子：
4.9
作者：
Brooks, David H.;Winebarger, Amy R.;Walsh, Robert
通讯作者：
Walsh, Robert