EGU2020-4615, updated on 08 Jan 2024
https://doi.org/10.5194/egusphere-egu2020-4615
EGU General Assembly 2020
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

MMS observations of reconnection separatrix region in the magnetotail at different distances from the active neutral X-line

Victor Sergeev1, Sergey Apatenkov1, Rumi Nakamura2, Simon Wellenzohn2, Ferdinand Plaschke2, Wolfgang Baumjohann2, Yuri Khotyaintsev3, Jim Burch4, Roy Torbert5, Christopher Russell6, and Barbara Giles7
Victor Sergeev et al.
  • 1St. Petersburg State University, Physics Faculty, Earth's Physics Dept., St. Petersburg, Russian Federation (victor@geo.phys.spbu.ru)
  • 2Space Research Institute of Austr.Acad.Sci., Graz, Austria
  • 3Swedish Institute of Space Physics, Uppsala, Sweden
  • 4Southwest Research Institute, San Antonio, TX, USA
  • 5Space Science Center, University of New Hampshire, Durham, NH, USA
  • 6IGPP/EPSS, University of California, Los Angeles, CA, USA
  • 7NASA Goddard Space Flight Center, Greenbelt, MD, USA

The region surrounding the reconnection separatrix consists of the multitude of particle and wave transient features (electron, cold and hot ion beams, Hall E&B fields, kinetic Alfven and LH waves, e-holes etc) whose pattern and intensities may vary depending on the stage of reconnection process as well as on the distance from the active neutral line (XNL), whose characterization from observations is not a trivial task. We explore quick MMS entries into the plasma sheet boundary layer from the lobe in 2017 and 2018 tail seasons which potentially could be the crossings of the active separatrix as suggested by energy dispersed beams and polar rain gap features. By combining  the observations of beam dispersion with the measured plasma convection and PSBL motion (obtained using the timing method) we attempt to separate  temporal and spatial (velocity filter) contributions  to the observed beam energy dispersion and evaluate the MMS distance from the XNL. In this report we discuss similarities and differences of separatrix manifestations  observed far from the XNL (at distances exceeding several tens Re) and those found close to it (where the outermost electron beam directed toward the XNL is seen).  One of surprizes was that we were often able to identify the intense Hall-like E&B field structures at very large distances from the XNL.  

How to cite: Sergeev, V., Apatenkov, S., Nakamura, R., Wellenzohn, S., Plaschke, F., Baumjohann, W., Khotyaintsev, Y., Burch, J., Torbert, R., Russell, C., and Giles, B.: MMS observations of reconnection separatrix region in the magnetotail at different distances from the active neutral X-line , EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-4615, https://doi.org/10.5194/egusphere-egu2020-4615, 2020.

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