First E region observations of mesoscale neutral wind interaction with auroral arcs

M. J. Kosch; C. Anderson; R. A. MakarevichB. A. CarterR. A. D. FioriM. CondeP. L. DysonT. Davies

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First E region observations of mesoscale neutral wind interaction with auroral arcs

机译：第一个E地区中尺度中立的观察风与极光弧的交互

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We report the first observations of E region neutral wind fields and their interactionwith auroral arcs at mesoscale spatial resolution during geomagnetically quiet conditions atMawson, Antarctica. This was achieved by using a scanning Doppler imager, which canobserve thermospheric neutral line-of-sight winds and temperatures simultaneously over.a wide field of view. In two cases, the background E region wind field wasperpendicular to an auroral arc, which when it appeared caused the wind direction within~50 km of the arc to rotate parallel along the arc, reverting to the background flowdirection when the arc disappeared. This was observed under both westward and eastwardplasma convection. The wind rotations occurred within 7-16 min. In one case, as anauroral arc propagated from the horizon toward the local zenith, the background E regionwind field became significantly weaker but remained unaffected where the arc had notpassed through. We demonstrate through modeling that these effects cannot be explainedby height changes in the emission layer. The most likely explanation seems to be thegreatly enhanced ion drag associated with the increased plasma density and localizedionospheric electric field associated with auroral arcs. In all cases, the F region neutralwind appeared less affected by the auroral arc, although its presence is clear in the data.

机译：我们报告了首次观察E中性风场及其interactionwith极光弧在中尺度的空间分辨率在atMawson眼睛安静的条件,南极洲。多普勒成像,canobserve thermospheric中性的视线风和温度同时结束。情况下,背景区域风场wasperpendicular极光弧,当它~ 50公里内出现了风向沿着电弧的电弧旋转平行,回到了flowdirection当背景弧消失了。西和eastwardplasma对流。在一个案例中,旋转发生在7 - 16分钟。从地平线anauroral弧传播向当地的天顶,背景E变得明显较弱但regionwind字段在弧notpassed尚未受到影响通过。这些影响不能explainedby高度发射层的变化。解释似乎是难得增强的离子阻力与等离子体密度的增加有关和localizedionospheric电场极光弧。地区neutralwind出现减少的影响极光弧,尽管它的存在是显而易见的数据。

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《Journal of Geophysical Research, A. Space Physics: JGR》 |2010年第2期|A02303:1-A02303:13|共13页
作者
M. J. Kosch; C. Anderson; R. A. MakarevichB. A. CarterR. A. D. FioriM. CondeP. L. DysonT. Davies;
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作者单位

ISAS, University of Saskatchewan, Saskatoon, Saskatchewan,Canada;

Department of Communication Systems, Lancaster University,Lancaster, UK;

Geophysical Institute, University of Alaska Fairbanks, Fairbanks,Alaska, USADepartment of Physics, La Trobe University, Melbourne, Victoria,Australia;

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正文语种英语
中图分类空间物理;
关键词
Wind; plasma density; e regionAURORAL ARCSIon dragfield of view;

机译：风;等离子体密度;e regionAURORAL ARCS在拖曳视野中;

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First E region observations of mesoscale neutral wind interaction with auroral arcs

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