3He-rich Solar Energetic Particles from Sunspot Jets
3He-rich Solar Energetic Particles from Sunspot Jets
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DOI：
10.3847/2041-8213/aaf37f
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发表时间：
2018-12-10
影响因子：
7.9
通讯作者：
Wang, Linghua
中科院分区：
文献类型：
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作者：
Bucik, Radoslav;Wiedenbeck, Mark E.;Wang, Linghua
太阳源的超热（< 1 MeV核子（-1））富氦-3太阳高能粒子（sep）通常与源自近赤道日冕洞外围小而致密的活动区域的喷流有关。相对罕见的高能量（bbb10 MeV核子（-1））富含he -3的sep的来源仍未被探索。在这里，我们介绍了当前太阳周期24中两个最强烈的富He-3 (He-3/He-4 > 1) SEP事件，这些事件是由高级成分探测器在能量> 10 MeV的核子（-1）上测量到的。虽然He-3表现出较高的强度，但zbbbb2离子低于探测阈值。这些事件伴随着iii型射电暴，但没有ii型发射，而ii型发射通常是在超热富氦-3 sep中看到的。利用太阳动力学观测站的高分辨率、极紫外成像和光球磁场观测对相应的太阳源进行了分析。我们发现这些事件的来源与喷流有关，这些喷流起源于具有复杂β - γ - δ磁结构的大型太阳黑子的边界。因此，在所研究的事件中，底层光球场的细节显然是产生高能氦-3的重要因素。
Solar sources of suprathermal (< 1 MeV nucleon(-1)) He-3-rich solar energetic particles (SEPs) have been commonly associated with jets originating in small, compact active regions at the periphery of near-equatorial coronal holes. Sources of relatively rare, high-energy (> 10 MeV nucleon(-1)) He-3-rich SEPs remain unexplored. Here we present two of the most intense He-3-rich (He-3/He-4 > 1) SEP events of the current solar cycle 24 measured on the Advanced Composition Explorer at energy > 10 MeV nucleon(-1). Although He-3 shows high intensities, Z > 2 ions are below the detection threshold. The events are accompanied by type-III radio bursts, but no type-II emission as typically seen for suprathermal He-3-rich SEPs. The corresponding solar sources were analyzed using high-resolution, extreme-ultraviolet imaging and photospheric magnetic field observations on the Solar Dynamics Observatory. We find the sources of these events associated with jets originating at the boundary of large sunspots with complex beta gamma delta magnetic configuration. Thus, details of the underlying photospheric field apparently are important to produce He-3 to high energies in the examined events.