标题： 太阳耀斑/CME爆发事件期间等离子体环与环顶相互作用及磁场流入的证据 显示英文标题

标题： Evidence of a Plasmoid-Looptop Interaction and Magnetic Inflows During a Solar Flare/CME Eruptive Event

摘要： 观测证据显示，在2007年1月25日的掩食边缘事件期间，一个向下传播的等离子体团与环顶核发生了合并。RHESSI在9-18 keV能量范围内的光变曲线，以及Learmonth太阳观测站245 MHz通道的数据，在合并发生时显示出日冕中增强的非热辐射，表明发生了额外的粒子加速。这被归因于在两个合并源之间形成的电流片中的二次重联事件。RHESSI图像用于确定等离子体团的平均向下速度为12 km/s。STEREO-Behind上搭载的SECCHI仪器套件的补充观测表明，这一过程发生在相关CME加速阶段。从波浪增强的EUVI图像中也展示了CME爆发前流入的磁力线证据。推导出的流入速度为1.5 km/s。这些观测结果支持了最近关于等离子体团形成、传播以及由于电流片形成期间撕裂模不稳定性导致后续粒子加速的数值模拟。 显示英文摘要

摘要： Observational evidence is presented for the merging of a downward-propagating plasmoid with a looptop kernel during an occulted limb event on 2007 January 25. RHESSI lightcurves in the 9-18 keV energy range, as well as that of the 245 MHz channel of the Learmonth Solar Observatory, show enhanced nonthermal emission in the corona at the time of the merging suggesting that additional particle acceleration took place. This was attributed to a secondary episode of reconnection in the current sheet that formed between the two merging sources. RHESSI images were used to establish a mean downward velocity of the plasmoid of 12 km/s. Complementary observations from the SECCHI suite of instruments onboard STEREO-Behind showed that this process occurred during the acceleration phase of the associated CME. From wavelet-enhanced EUVI, images evidence of inflowing magnetic field lines prior to the CME eruption is also presented. The derived inflow velocity was found to be 1.5 km/s. This combination of observations supports a recent numerical simulation of plasmoid formation, propagation and subsequent particle acceleration due to the tearing mode instability during current sheet formation.