DOAJ Open Access 2023

Poleward-Moving Black Aurora Associated with Impulse-Excited Field-Line Resonances in the Dawnside Sector: THEMIS and Ground Observations

Huayu Zhao Ying Liu Qiugang Zong Huigen Yang Zejun Hu +2 lainnya

Abstrak

The black aurora is a distinct phenomenon characterized by spatially well-defined regions where the diffuse auroral luminosity decreases notably. Typically, black auroras present as arcs moving at lower velocities, patches with higher moving speeds, and arc segments. However, the mechanism behind black auroras remains unclear. In this paper, we present a novel observation of a poleward-moving black auroral arc associated with impulse-excited field-line resonances in the dawnside sector from the multi-spacecraft THEMIS (Time History of Events and Macroscale Interactions during Substorms) mission, equivalent ionospheric currents, and a conjugated all-sky imager. The field-line resonance velocities exhibit periodic vorticity, which correspond to periodic poleward-moving bands of enhanced FACs. Based on the relatively large reduction in luminosity, we conclude that the poleward-moving black auroral arc was most likely caused by downward FACs associated with field-line resonances.

Topik & Kata Kunci

Elementary particle physics

Penulis (7)

Huayu Zhao

Ying Liu

Qiugang Zong

Huigen Yang

Zejun Hu

Xuzhi Zhou

Jicheng Sun

Format Sitasi

APA MLA BibTeX

Zhao, H., Liu, Y., Zong, Q., Yang, H., Hu, Z., Zhou, X. et al. (2023). Poleward-Moving Black Aurora Associated with Impulse-Excited Field-Line Resonances in the Dawnside Sector: THEMIS and Ground Observations. https://doi.org/10.3390/universe9060250

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Informasi Jurnal

Tahun Terbit: 2023
Sumber Database: DOAJ
DOI: 10.3390/universe9060250
Akses: Open Access ✓