Crater FTEs: Simulation results and THEMIS observations

Sibeck, D. G.; Кузнецова, М. М.; Angelopoulos, V.; Glaßmeier, K.‐H.; McFadden, J. P.

doi:10.1029/2008gl033568

Cited by 40 publications

(53 citation statements)

References 13 publications

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“…There are also some flux ropes with a decrease in magnetic field strength in the center, which are referred to as crater flux ropes (e.g., Farrugia et al, 1988;Sibeck et al, 2008). Zhang et al (2010) proposed that these crater flux ropes are initial stages of typical flux ropes, and they would evolve into typical flux ropes with a reduction of central plasma pressure resulting from the transport of plasma along their axes.…”

Section: Introductionmentioning

confidence: 99%

Magnetic depression and electron transport in an ion-scale flux rope associated with Kelvin–Helmholtz waves

Tang

Wang

et al. 2018

Ann. Geophys.

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Abstract. We report an ion-scale magnetic flux rope (the size of the flux rope is ∼ 8.5 ion inertial lengths) at the trailing edge of Kelvin-Helmholtz (KH) waves observed by the Magnetospheric Multiscale (MMS) mission on 27 September 2016, which is likely generated by multiple X-line reconnection. The currents of this flux rope are highly filamentary: in the central flux rope, the current flows are mainly parallel to the magnetic field, supporting a local magnetic field increase at about 7 nT, while at the edges the current filaments are predominantly along the antiparallel direction, which induce an opposing field that causes a significant magnetic depression along the axis direction (> 20 nT), meaning the overall magnetic field of this flux rope is depressed compared to the ambient magnetic field. Thus, this flux rope, accompanied by the plasma thermal pressure enhancement in the center, is referred to as a crater type. Intense lower hybrid drift waves (LHDWs) are found at the magnetospheric edge of the flux rope, and the wave potential is estimated to be ∼ 17 % of the electron temperature. Though LHDWs may be stabilized by the mechanism of electron resonance broadening, these waves could still effectively enable diffusive electron transports in the cross-field direction, corresponding to a local density dip. This indicates LHDWs could play important roles in the evolution of crater flux ropes.

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Section: Introductionmentioning

confidence: 99%

Magnetic depression and electron transport in an ion-scale flux rope associated with Kelvin–Helmholtz waves

Tang

Wang

et al. 2018

Ann. Geophys.

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“…5) and confirmed by a negative B z . As the FTE moved along the magnetopause (Mp), the MpCL thickened and Tha got closer to it (see the model by Sibeck et al, 2008). This close approach corresponds to the region bracketed in pink in which the electron spectrogram gives evidence for (i) a very low flux of energetic (magnetospheric) electrons and an increase in the temperature of low energy (magnetosheath) electrons.…”

Section: Electron Heatingmentioning

confidence: 99%

“…While crossing the magnetopause and adjacent regions, the five spacecraft have recorded the signatures of a flux transfer event (FTE). This FTE and the overall characteristics are described by Sibeck et al (2008). Here it is sufficient to keep in mind that the 5 spacecraft were essentially aligned along the XGSE direction and located in the afternoon sector, as shown on Fig.…”

Section: Instrumentation and Contextmentioning

confidence: 99%

A mechanism for heating electrons in the magnetopause current layer and adjacent regions

et al. 2011

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Abstract. Taking advantage of the string-of-pearls configuration of the five THEMIS spacecraft during the early phase of their mission, we analyze observations taken simultaneously in the magnetosheath, the magnetopause current layer and the magnetosphere. We find that electron heating coincides with ultra low frequency waves. It seems unlikely that electrons are heated by these waves because the electron thermal velocity is much larger than the Alfvén velocity (V a ). In the short transverse scale (k ⊥ ρ i >> 1) regime, however, short scale Alfvén waves (SSAWs) have parallel phase velocities much larger than V a and are shown to interact, via Landau damping, with electrons thereby heating them. The origin of these waves is also addressed. THEMIS data give evidence for sharp spatial gradients in the magnetopause current layer where the highest amplitude waves have a large component δB perpendicular to the magnetopause and k azimuthal. We suggest that SSAWs are drift waves generated by temperature gradients in a high beta, large T i /T e magnetopause current layer. Therefore these waves are called SSDAWs, where D stands for drift. SSDAWs have large k ⊥ and therefore a large Doppler shift that can exceed their frequencies in the plasma frame. Because they have a small but finite parallel electric field and a magnetic component perpendicular to the magnetopause, they could play a key role at reconnecting magnetic field lines. The growth rate depends strongly on the scale of the gradients; it becomes very large when the scale of the electron temperature gradient gets below 400 km. Therefore SSDAW's are expected to limit the sharpness of Correspondence to: P. Robert (patrick.robert@lpp.polytechnique.fr) the gradients, which might explain why Berchem and Russell (1982) found that the average magnetopause current sheet thickness to be ∼400-1000 km (∼500 km in the near equatorial region).

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“…Sibeck et al (2008) described the characteristics of an FTE that is embedded in a weakened magnetic field along the magnetopause current sheet that itself has a enhanced core field. In addition, the structure extends out into both the magnetosphere and magnetosheath.…”

Section: Introductionmentioning

confidence: 99%

“…If reconnection occurs simultaneously along the line, the resulting flux tube is expected to be obliquely oriented (Lee and Fu, 1985;Sibeck et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Scientific visualization to study Flux Transfer Events at the Community Coordinated Modeling Center

Rastätter

Кузнецова

Sibeck

et al. 2012

Advances in Space Research

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Crater FTEs: Simulation results and THEMIS observations

Cited by 40 publications

References 13 publications

Magnetic depression and electron transport in an ion-scale flux rope associated with Kelvin–Helmholtz waves

Magnetic depression and electron transport in an ion-scale flux rope associated with Kelvin–Helmholtz waves

A mechanism for heating electrons in the magnetopause current layer and adjacent regions

Scientific visualization to study Flux Transfer Events at the Community Coordinated Modeling Center

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