The Heppner‐Maynard Boundary measured by SuperDARN as a proxy for the latitude of the auroral oval
The Heppner‐Maynard Boundary measured by SuperDARN as a proxy for the latitude of the auroral oval
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SuperDARN 测量的赫普纳-梅纳德边界作为极光椭圆形纬度的代理
DOI：
10.1029/2012ja018222
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
M. Lester
中科院分区：
文献类型：
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作者：
S. Imber;S. Milan;M. Lester
我们提出了一项统计研究，将磁层顶到极光全球探测(IMAGE)SI-12质子极光相机的成像仪测量的极光椭圆形的纬度与从2000-2002年期间的超级双极光雷达网(SuperDARN)数据确定的赫普纳-梅纳德边界(HMB)的纬度联系起来。HMB代表电离层对流模式的纬度范围。用米兰等人的方法从质子极光图像中确定了椭圆形纬度。(2009A)，它符合以磁极黄昏2°和反太阳5°的点为中心的圆。对于那些并发的SuperDARN北半球地图包含超过200个数据点的图像，确定午夜的极光纬度，以便HMB被明确定义。统计研究包括超过19.8万个两分钟的间隔，我们发现HMB位于质子极光纬度的赤道方向平均2.2°。对2500多个亚暴的叠加历元分析表明，在地磁活动较高的时期，HMB和椭圆形纬度之间的分离略有增加。我们建议，在没有极光图像的间隔期间，HMB的纬度和运动可以作为极光的替代，从而提供关于开放/闭合场线边界的运动的信息。
We present a statistical study relating the latitude of the auroral oval measured by the Imager for Magnetopause‐to‐Aurora Global Exploration (IMAGE) SI‐12 proton auroral camera to that of the Heppner‐Maynard Boundary (HMB) determined from Super Dual Auroral Radar Network (SuperDARN) data during the period 2000–2002. The HMB represents the latitudinal extent of the ionospheric convection pattern. The oval latitude from the proton auroral images is determined using the method of Milan et al. (2009a), which fits a circle centered on a point 2° duskward and 5° antisunward of the magnetic pole. The auroral latitude at midnight is determined for those images where the concurrent SuperDARN northern hemisphere maps contain more than 200 data points such that the HMB is well‐defined. The statistical study comprises over 198,000 two‐minute intervals, and we find that the HMB is located on average 2.2° equatorward of the proton auroral latitude. A superposed epoch analysis of over 2500 substorms suggests that the separation between the HMB and the oval latitude increases slightly during periods of high geomagnetic activity. We suggest that during intervals where there are no auroral images available, the HMB latitude and motion could be used as a proxy for that of the aurora, and therefore provide information about motions of the open/closed field line boundary.
影响因子：
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作者：
J. Wild;A. Grocott
通讯作者：
J. Wild;A. Grocott
影响因子：
1.9
作者：
J. Wild;E. Woodfield;S. Morley
通讯作者：
J. Wild;E. Woodfield;S. Morley