Title of the Presentation

Statistics of high-speed electron flows in the terrestrial magnetotail

Presentation Type

Talk

Presenter Format

Virtual Meeting Talk

Topic

Nightside Science

Start Date

11-5-2022 10:30 AM

Abstract

Using observations of the Magnetospheric Multiscale (MMS) mission in the terrestrial magnetotail from 2017 to 2020, we perform a systematic survey of fast electron flows with speeds higher than 5000 km/s. High-speed flows are often masked in the plasma moments by low-energy secondary electrons. Using partial moments, we remove these instrument electrons and recalculate the electron moments. After this procedure, we identify a total of 587 events. Here, we show the preliminary results of their statistical properties, including locations, spatial-temporal scales, plasma conditions, and electromagnetic field conditions. We observe a clear dawn-dusk asymmetry in the event locations: after accounting for spacecraft dwell time, 80% of the events are found on the dusk side. Approximately 90% of the events are found in the separatrix region, the plasma sheet boundary layer, or the lobe region, and the rest are near the neutral line. We identify ~20 electron diffusion region candidates, which we are currently analyzing in more detail.

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May 11th, 10:30 AM

Statistics of high-speed electron flows in the terrestrial magnetotail

Using observations of the Magnetospheric Multiscale (MMS) mission in the terrestrial magnetotail from 2017 to 2020, we perform a systematic survey of fast electron flows with speeds higher than 5000 km/s. High-speed flows are often masked in the plasma moments by low-energy secondary electrons. Using partial moments, we remove these instrument electrons and recalculate the electron moments. After this procedure, we identify a total of 587 events. Here, we show the preliminary results of their statistical properties, including locations, spatial-temporal scales, plasma conditions, and electromagnetic field conditions. We observe a clear dawn-dusk asymmetry in the event locations: after accounting for spacecraft dwell time, 80% of the events are found on the dusk side. Approximately 90% of the events are found in the separatrix region, the plasma sheet boundary layer, or the lobe region, and the rest are near the neutral line. We identify ~20 electron diffusion region candidates, which we are currently analyzing in more detail.