Hwang K-J, Dokgo K, Choi E, Burch J L, Sibeck D G, Giles B L, Hasegawa H, Fu H S, Liu Y, Wang Z, Nakamura T K M, Ma X, Fear R C, Khotyaintsev Y, Graham D B, Shi Q Q, Escoubet C P, Gershman D J, Paterson W R, Pollock C J, Ergun R E, Torbert R B, Dorelli J C, Avanov L, Russell C T, Strangeway R J
Southwest Research Institute San Antonio TX USA.
NASA Goddard Space Flight Center Greenbelt MD USA.
J Geophys Res Space Phys. 2020 Apr;125(4):e2019JA027665. doi: 10.1029/2019JA027665. Epub 2020 Apr 8.
On 5 May 2017, MMS observed a crater-type flux rope on the dawnside tailward magnetopause with fluctuations. The boundary-normal analysis shows that the fluctuations can be attributed to nonlinear Kelvin-Helmholtz (KH) waves. Reconnection signatures such as flow reversals and Joule dissipation were identified at the leading and trailing edges of the flux rope. In particular, strong northward electron jets observed at the trailing edge indicated midlatitude reconnection associated with the 3-D structure of the KH vortex. The scale size of the flux rope, together with reconnection signatures, strongly supports the interpretation that the flux rope was generated locally by KH vortex-induced reconnection. The center of the flux rope also displayed signatures of guide-field reconnection (out-of-plane electron jets, parallel electron heating, and Joule dissipation). These signatures indicate that an interface between two interlinked flux tubes was undergoing interaction, causing a local magnetic depression, resulting in an M-shaped crater flux rope, as supported by reconstruction.
2017年5月5日，磁层多尺度任务（MMS）在晨侧尾向磁层顶观测到一个具有波动的火山口型通量绳。边界法线分析表明，这些波动可归因于非线性开尔文-亥姆霍兹（KH）波。在通量绳的前缘和后缘识别出了诸如流反转和焦耳耗散等重联特征。特别是，在后缘观测到的强烈北向电子喷流表明了与KH涡旋三维结构相关的中纬度重联。通量绳的尺度大小以及重联特征，有力地支持了通量绳是由KH涡旋诱导重联在当地产生的这一解释。通量绳的中心还显示出引导场重联的特征（面外电子喷流、平行电子加热和焦耳耗散）。这些特征表明，两个相互连接的通量管之间的界面正在相互作用，导致局部磁凹陷，从而形成一个M形火山口通量绳，重建结果也支持这一点。
