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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >The dynamics of the proton aurora in auroral breakup events
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The dynamics of the proton aurora in auroral breakup events

机译：极光破裂事件中质子极光的动力学

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Proton auroral dynamics during auroral breakup events are examined compared to electron auroral dynamics using monochromatic imaging and tilting-filter photometer data obtained at Syowa station, Antarctica (corrected geomagnetic latitude: -66.23 degrees, L 6.15). During the period from May to September 1992, 35 typical breakup events were observed, in which 23 events showed a signature of poleward expansion of the auroral bulge, while 12 events showed a signature of the westward traveling surge. Careful analysis revealed that when an electron aurora are is enhanced and moves poleward after substorm onset, the region of proton aurora also expands poleward, forming a sharp boundary, and that this poleward boundary always coincides with the leading edge of the electron auroral. bulge. At the poleward boundary the Doppler shift of proton aurora is quite large (similar to0.8 nm), while the maximum intensity of proton aurora is observed somewhat equatorward of the leading edge. These facts imply that precipitating protons with higher energies and highly field aligned pitch angles are produced at the poleward boundary through the plasma injection process in the magnetosphere. In 6 out of 35 breakup events, multiple N-S aligned electron aurora arcs (N-S auroras) appeared. An important finding is that the appearance of prominent N-S auroras in the auroral bulge results in the rapid poleward contraction of the proton aurora belt when the activity of electron aurora becomes low. It is therefore inferred that in the case accompanied by the N-S auroras the complete dipolarization of the magnetic held occurs after the recovery phase. [References: 49]
机译：使用单色成像和在南极洲Syowa站获得的倾斜滤光光度计数据，比较了极光破裂事件中的质子极光动力学与电子极光动力学（校正的地磁纬度：-66.23度，L 6.15）。在1992年5月至9月期间，观察到35个典型的破裂事件，其中23个事件表明极光隆起向极扩张，而12个事件表明向西隆升。仔细的分析表明，当电子极光增强并在亚暴爆发后向极极移动时，质子极光的区域也会向极极扩展，形成一个清晰的边界，并且该极极边界始终与电子极光的前边缘重合。凸。在极向边界处，质子极光的多普勒频移非常大（类似于0.8 nm），而质子极光的最大强度在前缘稍偏赤道。这些事实意味着，通过磁层中的等离子体注入过程，在极向边界处会产生具有更高能量和高度场对准俯仰角的质子。在35次破裂事件中，有6次出现了多个N-S排列的电子极光弧（N-S极光）。一个重要发现是，当电子极光的活动性降低时，极光凸起中显着的N-S极光的出现会导致质子极光带的快速极向收缩。因此可以推断，在伴有N-S极光的情况下，在恢复阶段之后发生了所保持磁场的完全双极化。 [参考：49]

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