Slow Contraction of Flash Aurora Induced by an Isolated Chorus Element Ranging From Lower‐Band to Upper‐Band Frequencies in the Source Region

Slow Contraction of Flash Aurora Induced by an Isolated Chorus Element Ranging From Lower‐Band to Upper‐Band Frequencies in the Source Region
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源区域中从低频带到高频带频率范围内的孤立合唱元素引起的闪光极光的缓慢收缩

DOI:
10.1029/2021gl097597
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发表时间:
2022
影响因子:
5.2
通讯作者:
Imamura, Kousuke
Imamura, Kousuke
中科院分区:
地球科学1区
文献类型:
--
作者:
Ozaki, Mitsunori;Yagitani, Satoshi;Shiokawa, Kazuo;Tanaka, Yoshimasa;Ogawa, Yasunobu;Hosokawa, Keisuke;Kasahara, Yoshiya;Ebihara, Yusuke;Miyoshi, Yoshizumi;Imamura, Kousuke

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由孤立的合唱元素驱动的闪光极光可以是一个有用的电离层指示器,用于通过波粒相互作用识别源波特性。利用地面观测和模拟的方法,我们在这里报告的闪光极光的时间特性,取决于合唱频率的宽度和扫描速率。我们发现,在斑片状极光变化的收缩时间增加超过扩张时间,由于最小电子能量的差异共振合唱波包远离赤道源高纬度。特别地,收缩时间强烈地依赖于由于与较低能量电子的回旋共振而产生的较高频率的合唱波。模型计算支持合唱元素的范围从较低频带到较高频带频率相对于在确切的生成区域的陀螺频率的一半。我们的研究通过电离层中闪光极光的时空特征提供了瞬时(毫秒)合唱驱动的电子动力学。
Flash aurora driven by an isolated chorus element can be a useful ionospheric indicator for identifying the source wave properties via wave‐particle interactions. Using ground observation and modeling approaches, here we report the temporal characteristics of flash aurora that depend on the chorus frequency width and the sweep rate. We found that the contraction time increases more than the expansion time in patchy auroral variations, due to the difference in the minimum electron energies resonated with the chorus wave packet away from the equatorial source to higher latitudes. Especially, the contraction time strongly depends on the higher‐frequency chorus waves due to cyclotron resonance with lower‐energy electrons. The model calculations support that the chorus element ranges from lower‐band to upper‐band frequencies with respect to half the gyrofrequency at the exact generation region. Our study provides the prompt (milliseconds) chorus‐driven electron dynamics through the spatiotemporal characteristics of flash aurora in the ionosphere.
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