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首页> 外文会议>Cluster and double star symposium >CLUSTER OBSERVATIONS OF THE ELECTRON EDGE OF THE LOW-LATITUDEBOUNDARY LAYER AT MID-ALTITUDES
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CLUSTER OBSERVATIONS OF THE ELECTRON EDGE OF THE LOW-LATITUDEBOUNDARY LAYER AT MID-ALTITUDES

机译：中纬度低纬度边界层电子边缘的团簇观测

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The nature of the particle precipitations at dayside midaltitudesrncan be interpreted in terms of evolution ofrnreconnected field lines. Due to the difference betweenrnelectron and ion parallel velocities, two distinctivernboundary layers should be observed at mid-altitudesrnbetween the open-closed boundary and the injections inrnthe cusp proper. The first layer, the electron-dominatedrnboundary layer, named the electron edge of the Low-rnLatitude Boundary Layer (LLBL), consists of softrnmagnetosheath electrons and high-energy plasma sheetrnions. The second layer, the LLBL proper, is a mixture ofrnboth ions and electrons with magnetosheath energies.rnThe Cluster spacecraft frequently observe thesernboundary layers. We present one example of a midaltituderncusp crossing with an extended electron edge ofrnthe LLBL. This electron edge contains 10-200 eV lowdensityrnisotropic electrons presumably from the halornsolar wind source and parallel and/or anti-parallelrnelectron beams with higher fluxes acceleratedrnpresumably near the magnetopause X-line. We havernused 3 years of data of mid-altitude cusp crossings torncarry out a statistical study of the location and size ofrnthis electron edge of the LLBL. The electron edge sizernhas been estimated using new multi-spacecraftrntechniques. The Cluster tetrahedron crossed electronrnand ion boundaries of the LLBL/cusp with time delaysrnof 1-40 minutes, so we can reconstruct the motion of thernelectron boundary between different spacecraftrnobservations and improve the accuracy of the estimationrnof the boundary layer size. Our study shows that thernelectron edge was observed in 87% of mid-altitude cusprncrossings by Cluster. The size of this region variedrnbetween 0°-2° Invariant Latitude (ILAT) with a medianrnvalue of 0.2° ILAT. Generally the size of the electronrnedge depends on the combination of many parameters,rnbut we have found anti-correlation between the size ofrnthis region and the magnitude of the IMF and solar windrndynamic pressure, as expected from a simplernreconnection model.
机译：可以通过重新连接的场线的演化来解释白天中空的粒子降水的性质。由于电子和离子平行速度之间的差异，应该在开闭边界与尖端处的注入之间的中间高度观察到两个独特的边界层。第一层是电子占主导的边界层，称为低纬度边界层（LLBL）的电子边缘，由软磁石电子和高能等离子体碎片组成。第二层是LLBL固有层，是离子和电子与磁能的能量的混合物。群星飞船经常观察其边界层。我们提出一个例子，一个中空尖峰与LLBL的扩展电子边缘相交。该电子边缘包含大约10-200 eV的低密度各向同性电子，这些电子可能来自卤质太阳风源，以及具有较高通量的平行和/或反平行电子束，可能在磁致绝经X线附近加速了。我们已经使用了3年的中海拔尖顶穿越数据，对LLBL电子边缘的位置和大小进行了统计研究。已经使用新的多宇宙飞船技术估计了电子边缘的大小。团簇四面体越过LLBL /尖点的电子和离子边界，延迟时间为1-40分钟，因此我们可以重建不同航天器观测之间的电子边界运动，并提高边界层大小的估计精度。我们的研究表明，在簇中，在中海拔cusprncrossing的87％中观察到了电子边缘。该区域的大小在0°-2°不变纬度（ILAT）之间变化，中间值为0.2°ILAT。通常，电子边缘的大小取决于许多参数的组合，但是，正如从简单的重新连接模型所预期的那样，我们发现该区域的大小与IMF大小和太阳风动压之间存在反相关关系。

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  • 会议地点 Noordwijk(NL);Noordwijk(NL)
  • 作者

    Y.V. Bogdanova; C.J. Owen; A.N. Fazakerley; B. Klecker; H. Reme;

  • 作者单位

    Mullard Space Science Laboratory, University College London, Holmbury St.Mary, Dorking, Surrey, RH5 6NT, UK,rnE-mail:jb@mssl.ucl.ac.uk;

    Mullard Space Science Laboratory, University College London, Holmbury St.Mary, Dorking, Surrey, RH5 6NT, UK;

    Mullard Space Science Laboratory, University College London, Holmbury St.Mary, Dorking, Surrey, RH5 6NT, UK;

    Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse, 85741 Garching, Germany;

    Centre d'Etude Spatiale des Rayonnements, France;

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