EDR signatures observed by MMS in the 16 October event presented in a 2‐D parametric space

Alm, L.; Argall, M. R.; Torbert, R. B.; Farrugia, C. J.; Burch, J. L.; Ergun, R. E.; Russell, C. T.; Strangeway, R. J.; Khotyaintsev, Yuri V.; Lindqvist, Per‐Arne; Marklund, Göran; Giles, B. L.; Shuster, J. R.

doi:10.1002/2016ja023788

Cited by 2 publications

(3 citation statements)

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“…Their gyroradius, 3.6 km in a 15 nT field, provides an upper limit to the width of the EDR. This is consistent with a width of 2–3 km determined by Alm et al () via a 2‐D parametric space mapping of the EDR.…”

Section: Discussionsupporting

confidence: 91%

“…In this paper, we attempt to answer both of these questions by examining the 16 December 2015 13:07:02 UT EDR encounter studied by Alm et al (2017), ; Denton et al (2016), Egedal et al (2016), 10.1002/2017JA024524 , Shuster et al (2017), Torbert et al (2016), and others. We complement data from the Fast Plasma Instrument (FPI) with data from the Electron Drift Instrument (EDI), which is capable of measuring ambient flux up to 30 times faster (at select energies and pitch angles), in order to better understand agyrotropy on the ion and electron inertial scales.…”

Section: 1002/2017ja024524mentioning

confidence: 99%

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Electron Dynamics Within the Electron Diffusion Region of Asymmetric Reconnection

et al. 2018

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We investigate the agyrotropic nature of electron distribution functions and their substructure to illuminate electron dynamics in a previously reported electron diffusion region (EDR) event. In particular, agyrotropy is examined as a function of energy to reveal detailed finite Larmor radius effects for the first time. It is shown that the previously reported ∼66 eV agyrotropic “crescent” population that has been accelerated as a result of reconnection is evanescent in nature because it mixes with a denser, gyrotopic background. Meanwhile, accelerated agyrotropic populations at 250 and 500 eV are more prominent because the background plasma at those energies is more tenuous. Agyrotropy at 250 and 500 eV is also more persistent than at 66 eV because of finite Larmor radius effects; agyrotropy is observed 2.5 ion inertial lengths from the EDR at 500 eV, but only in close proximity to the EDR at 66 eV. We also observe linearly polarized electrostatic waves leading up to and within the EDR. They have wave normal angles near 90°, and their occurrence and intensity correlate with agyrotropy. Within the EDR, they modulate the flux of 500 eV electrons travelling along the current layer. The net electric field intensifies the reconnection current, resulting in a flow of energy from the fields into the plasma.

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Section: Discussionsupporting

confidence: 91%

Section: 1002/2017ja024524mentioning

confidence: 99%

Electron Dynamics Within the Electron Diffusion Region of Asymmetric Reconnection

et al. 2018

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“…Alm et al. (2017) used STD to calculate the time‐dependent two‐dimensional velocity of the spacecraft moving through a structure of ion‐scale magnetopause flux ropes. Manuzzo et al.…”

Section: Introductionmentioning

confidence: 99%

Two‐Dimensional Velocity of the Magnetic Structure Observed on July 11, 2017 by the Magnetospheric Multiscale Spacecraft

et al. 2021

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In magnetic reconnection, plasma flows toward the magnetic X line (a magnetic null in the reconnection plane, in which it appears as an X point) with an inflow velocity and is accelerated and ejected in an orthogonal direction with an outflow velocity because of the large curvature of the magnetic field in the vicinity of the X line (e.g., Sonnerup, 1979; Vasyliunas, 1975). To determine these velocities, one needs to determine the frame of reference in which the X line is stationary. Thus an important part of the process of understanding a magnetic reconnection event is to determine the velocity of the magnetic structure relative to the observing spacecraft. Although on large scales, plasma may be "frozen in" to the magnetic field, at least in directions perpendicular to the magnetic field, this is typically not the case on small scales close to the X line, especially in the region known as the electron diffusion region (Hesse et al., 2011, 2014). Shi et al. (2019) has reviewed methods to determine a coordinate system and magnetic structure velocity. Methods to determine the velocity include calculating the deHoffmann-Teller frame in which the electric field is approximately zero, various types of timing analysis, various reconstruction methods, and the Spatial-Temporal Difference (STD) method (Shi et al., 2006). STD has been used by Denton et al. (2016a, 2016b) and Yao et al. (2016, 2018) to determine the time-dependent velocity of a magnetic structure in the normal direction. Alm et al. (2017) used STD to calculate the time-dependent two-dimensional velocity of the spacecraft moving through a structure of ion-scale magnetopause flux ropes. Manuzzo et al. (2019)

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EDR signatures observed by MMS in the 16 October event presented in a 2‐D parametric space

Cited by 2 publications

References 42 publications

Electron Dynamics Within the Electron Diffusion Region of Asymmetric Reconnection

Electron Dynamics Within the Electron Diffusion Region of Asymmetric Reconnection

Two‐Dimensional Velocity of the Magnetic Structure Observed on July 11, 2017 by the Magnetospheric Multiscale Spacecraft

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