Altitude of the upper boundary of AAR based on observations of ion beams in inverted-V structures: A case study
Science China-earth Sciences(2016)
摘要
Outflowing ion beams forming four successive inverted-V structures in the energy-time spectrograms of H + , He + , and O + were observed at an altitude of 3.4 R E by Cluster satellites travelling above the auroral acceleration region (AAR) in the southern hemisphere on February 14, 2001. Energization by negative U-shaped potential structures in the AAR is believed to be responsible for the formation of these outflowing ion inverted-V structures. Thus, utilizing the different motion properties of the three ion species, the altitude of the upper boundary of the AAR is estimated to be ~11100 km. Moreover, based on multi-satellite observations, each ofthese U-shaped potential structures involved in this event crosses the latitud in aldirection at ~0.4°-1° invariant latitude (ILAT), moving poleward at an average speed of ~0.2° ILAT per minute, before disappearing at ~71.5° ILAT.
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关键词
Outflowing ion beams, Inverted-V structure, Auroral acceleration region, U-shaped potential structure, Altitude of upper boundary
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