Surveying pulsating auroras
Surveying pulsating auroras
复制标题
测量脉动极光
DOI：
10.5194/angeo-2019-129
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发表时间：
2019
影响因子：
1.9
通讯作者：
E. Donovan
中科院分区：
文献类型：
--
作者：
E. Grono;E. Donovan
抽象的。清晨的极光椭圆形被脉动的极光所主导。人们经常把这些极光当作一种现象来讨论，但事实并非如此。脉动极光根据其脉动的程度是可分离的，并至少分为三个亚类。这项研究调查了10年的全天相机数据，以确定每种类型的脉动极光在磁当地时间和磁纬度中的出现概率。无定形脉动极光(APA)是清晨极光椭圆形中普遍存在的几乎每天都有的特征，其峰值出现的可能性为86 %。片状脉动极光(PPA)和片状极光(PAS)较少见，峰值分别为21 %和29 %。在当地午夜之前，脉动的极光几乎完全是APA。将APAs、PPAs和Pas的赋存分布映射到赤道平面，以近似定位它们的源区。PPA和PPA的分布主要分布在大约4-9 RE之间，而一些APA分布到更远的距离，这表明PPA和PPA的结构机制受内部磁层的限制。这与Grono和Donovan(2019)确定这些极光相对于质子极光的位置是一致的。
Abstract. The early-morning auroral oval is dominated by pulsating auroras. These auroras have often been discussed as if they are one phenomenon, but they are not. Pulsating auroras are separable based on the extent of their pulsation and structuring into at least three subcategories. This study surveyed 10 years of all-sky camera data to determine the occurrence probability for each type of pulsating aurora in magnetic local time and magnetic latitude. Amorphous pulsating aurora (APAs) are a pervasive, nearly daily feature in the early-morning auroral oval which have an 86 % chance of occurrence at their peak. Patchy pulsating auroras (PPAs) and patchy auroras (PAs) are less common, peaking at 21 % and 29 %, respectively. Before local midnight, pulsating auroras are almost exclusively APAs. Occurrence distributions of APAs, PPAs, and PAs are mapped into the equatorial plane to approximately locate their source regions. The PA and PPA distributions primarily map to locations approximately between 4 and 9 RE, while some APAs map to farther distances, suggesting that the mechanism which structures PPAs and PAs is constrained to the inner magnetosphere. This is in agreement with Grono and Donovan (2019), which located these auroras relative to the proton aurora.
影响因子：
56.9
作者：
Nishimura, Y.;Bortnik, J.;Auster, U.
通讯作者：
Auster, U.