Polar cap precursor of nightside auroral oval disturbances using polar cap arcs Ying Zou (UCLA); Y. Nishimura; L. R. Lyons; K. Shiokawa; E. F. Donovan;

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Presentation transcript:

Polar cap precursor of nightside auroral oval disturbances using polar cap arcs Ying Zou (UCLA); Y. Nishimura; L. R. Lyons; K. Shiokawa; E. F. Donovan; J. M. Ruohoniemi; K. A. McWilliams; N. Nishitani Science question: What determines when and where a meso-scale auroral enhancement occurs?

Polar cap arc/flow  PBI  substorm Case 1 midnight

70 ⁰ 80 ⁰ 90 ⁰ Overview of 3-h interval Polar cap arc  PBI  substorm Major intensifications Spatially connected to polar cap arc Did not occur until the polar cap arc contacted the auroral poleward boundary

Polar cap arc/flow  poleward-expanding intensification Case 2

Overview of 3-h interval Polar cap arc  poleward- expanding intensification : Major intensifications Visually connected to the polar cap arc Did not occur until the polar cap arc contacted the auroral poleward boundary 80 ⁰ 70 ⁰ 90 ⁰

Statistics of Association Polar cap arcs: steady for >~ 1 h Nightside auroral oval intensifications as being related: spatial connection to polar cap arcs Common association: 85%! Initiation of oval disturbances relative to contact <~ 11 min time lag Almost no longitudinal separation Initiation width of oval disturbance: <1 h MLT Time Lag Longitudinal Separation Width of disturbance

Summary Polar cap arcs well mark localized fast flows. Upon contacting nightside auroral poleward boundary, polar cap arcs lead to oval intensifications ~85% of the time. Oval intensification happens <~10 min and almost the same longitude of the contact. The observed association suggests that localized polar cap flows can substantially influence activity within auroral oval.