Phan T D, Verniero J L, Larson D, Lavraud B, Drake J F, Øieroset M, Eastwood J P, Bale S D, Livi R, Halekas J S, Whittlesey P L, Rahmati A, Stansby D, Pulupa M, MacDowall R J, Szabo P A, Koval A, Desai M, Fuselier S A, Velli M, Hesse M, Pyakurel P S, Maheshwari K, Kasper J C, Stevens J M, Case A W, Raouafi N E
SSL University of California Berkeley CA USA.
NASA Goddard Space Flight Center Greenbelt MD USA.
Geophys Res Lett. 2022 May 16;49(9):e2021GL096986. doi: 10.1029/2021GL096986. Epub 2022 May 4.
We report observations of reconnection exhausts in the Heliospheric Current Sheet (HCS) during Parker Solar Probe Encounters 08 and 07, at 16 and 20 , respectively. Heliospheric current sheet (HCS) reconnection accelerated protons to almost twice the solar wind speed and increased the proton core energy by a factor of ∼3, due to the Alfvén speed being comparable to the solar wind flow speed at these near-Sun distances. Furthermore, protons were energized to super-thermal energies. During E08, energized protons were found to have leaked out of the exhaust along separatrix field lines, appearing as field-aligned energetic proton beams in a broad region outside the HCS. Concurrent dropouts of strahl electrons, indicating disconnection from the Sun, provide further evidence for the HCS being the source of the beams. Around the HCS in E07, there were also proton beams but without electron strahl dropouts, indicating that their origin was not the local HCS reconnection exhaust.
我们报告了在帕克太阳探测器第08次和第07次相遇期间，分别在16和20时对日球电流片（HCS）中重联耗尽区的观测结果。由于在这些近日距离处阿尔文速度与太阳风流速相当，日球电流片（HCS）重联将质子加速到几乎两倍于太阳风速度，并使质子核心能量增加了约3倍。此外，质子被加速到超热能量。在E08期间，发现被加速的质子沿着分离线磁力线从耗尽区泄漏出来，在HCS外的广阔区域表现为场向高能质子束。同时出现的日冕电子束缺失，表明与太阳断开连接，这为HCS是这些束流的来源提供了进一步证据。在E07的HCS周围也有质子束，但没有日冕电子束缺失，这表明它们的起源不是当地的HCS重联耗尽区。
