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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Fine-scale transient arcs seen in a shock aurora
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Fine-scale transient arcs seen in a shock aurora

机译：有些叶片瞬态冲击极光弧

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摘要

We report, for the first time, fine-scale transient arcs that emerged successively within the initial 1–2 min evolutionary interval of a postnoon shock aurora on 14 July 2012. Data were acquired from ~2 Hz temporal resolution imaging of dayside aurora with a white light all-sky camera (ASC) at South Pole Station (magnetic latitude = -74.3°, magnetic local time = UT -3.5 h). Just after 1809:50 UT at which the initial response to an interplanetary (IP) shock was detected in the postnoon geosynchronous magnetic field, the ASC observed three successive transient arcs of which the locations shifted equatorward with an abrupt jump by ~0.2° in latitude. All of the transient arcs occurred in a closed field line region, ~1.0°–1.5° equatorward of the polar cap or open/closed field line boundary inferred from the intensity ratio of I_(630.0)/I_(557.7) but just poleward of the shock-induced proton and diffuse-type electron aurorae. Each of the transient arcs had a latitudinal width of ~0.1° and a short lifetime of ~20–30 s. Although the obvious mechanism has still remained unclear, possible interpretations of the fine-scale transient arc features are discussed in terms of a local process of each of the magnetospheric origin (mode conversion) and ionospheric origin (feedback interaction) that may be induced by IP shock.
机译：我们报告,第一次,精细瞬态弧先后出现最初的进化的间隔1 - 2分钟2012年7月14日postnoon冲击极光。从~ 2赫兹获得时间分辨率成像用白光全天的光面的极光相机(ASC)在南极站(磁当地时间纬度= -74.3°,磁= -3.5 UTh)。刚刚1809:50 UT的原价回应一个星际(IP)冲击postnoon同步磁检测场,ASC观察三个连续的瞬态弧的位置发生了变化朝赤道方向突然跳的~ 0.2°纬度。闭域线地区-1.5 ~ 1.0°°朝赤道方向的极冠或开/闭域边界强度比的推断I_ (630.0) / I_(557.7)但就向极的触觉质子和电子弥漫型极光。~ 0.1°纬度的宽度和短暂的一生~ 20 - 30年代。仍不清楚,可能的解释精细瞬时电弧的特性当地的角度讨论每个人的过程地球(模式变换)和起源电离层起源(反馈交互)可能引起的IP冲击。

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