The Digital Wave-Processing Experiment on Cluster

Woolliscroft, L. J. C.; Alleyne, H.; Dunford, C.; Sumner, A.E.; Thompson, J. A.; Walker, S. N.; Yearby, K. H.; Buckley, A M; Chapman, S.; Gough, M. P.

doi:10.1007/978-94-011-5666-0_9

Cited by 29 publications

(17 citation statements)

References 2 publications

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“…The magnetic and electric field measurements were made by the fluxgate magnetometer FGM [ Balogh et al , ] and Electric Fields and Waves (EFW) instruments [ Gustafsson et al , ], respectively. EFW is a part of Cluster Wave Consortium (WEC) [ Pedersen et al , ], a suite of plasma wave instruments centrally controlled by the Digital Wave Processor (DWP) instrument [ Woolliscroft et al , ]. The EFW instrument consists of two pairs of spherical probe sensors, each on a 44m wire boom in the spin plane of the satellite.…”

Section: Data and Instrumentationmentioning

confidence: 99%

On the fine structure of dipolarization fronts

et al. 2014

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Measurements from the closely spaced Cluster spacecraft are used to study the structure of the magnetic and electric fields within the magnetic ramp of dipolarization fronts (DF) observed close to the neutral sheet and the midnight meridian (YGSM<3RE). The spacecraft separation was small enough (<300 km) to treat the magnetic ramp of the DF front as a planar structure as indicated from variance analysis. The finite value of the magnetic field along the minimum variance direction for the events studied indicates that the dipolarization front structure was distinct from a tangential discontinuity. In addition to the main increase of the magnetic field in the maximum variance component, strong oscillations were observed in the intermediate component. The presence of this oscillatory structure results in an expansion of the region in which a change of magnetic pressure occurs, the size of which is typically an ion Larmor radius or greater. This widening is important in maintaining the pressure balance at the edge of the DF. This phenomenon resembles observations of intense current sheets in the magnetotail and also laboratory experiments of current sheet formation, in which a similar widening of the ramp region has been observed. In this paper we argue against the idea that an electron temperature anisotropy, resulting in electron curvature currents, can explain the formation of the oscillatory structures observed at DFs. These oscillations can be explained as eigenmode waves of the plasma that propagate away from the disturbance (DF) that is moving at subsonic speeds. Oscillations observed within the magnetic ramp indicate field‐aligned currents that are expected to be associated with DF.

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Section: Data and Instrumentationmentioning

confidence: 99%

On the fine structure of dipolarization fronts

et al. 2014

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“…The selection criteria for the shocks will be outlined in the next section. Electric field data, used to estimate the cross‐shock potential, were collected by the Electric Fields and Waves experiment (EFW) [ Gustafsson et al , 1997], which is part of the wave consortium controlled by the Digital Wave Processor (DWP) [ Woolliscroft et al , 1997]. The electric field sensors, used by the EFW instrument consist of four spherical probes each of which is attached to the satellite via a 44m wire boom.…”

Section: Data and Instrumentationmentioning

confidence: 99%

A statistical study of the cross‐shock electric potential at low Mach number, quasi‐perpendicular bow shock crossings using Cluster data

Dimmock¹,

Balikhin²,

Krasnoselskikh³

et al. 2012

J. Geophys. Res.

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.[1] The cross-shock electrostatic potential at the front of collision-less shocks plays a key role in the distribution of energy at the shock front. Multipoint measurements such as those provided by the Cluster II mission provide an ideal framework for the study of the cross-shock potential because of their ability to distinguish between temporal and spacial variations at the shock front. We present a statistical study of the cross-shock potential calculated for around 50 crossings of the terrestrial bow shock. The statistical dependency of the normalized (with resect to upstream ion kinetic energy) cross-shock potential (F K ) on the upstream Alfvén Mach number is in good agreement with analytical results that predict decrease of F k with increasing Mach number.Citation: Dimmock, A. P., M. A. Balikhin, V. V. Krasnoselskikh, S. N. Walker, S. D. Bale, and Y. Hobara (2012), A statistical study of the cross-shock electric potential at low Mach number, quasi-perpendicular bow shock crossings using Cluster data,

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“…These data rates are coordinated by the Master Science Plan and internally within the Wave Experiment Consortium (WEC). The telemetry packaging of the EFW data is made by the Digital Wave Processor (DWP) instrument (Wooliscroft et al, 1997).…”

Section: Output Data Ratementioning

confidence: 99%

First results of electric field and density observations by Cluster EFW based on initial months of operation

et al. 2001

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Abstract. Highlights are presented from studies of the electric field data from various regions along the CLUS-TER orbit. They all point towards a very high coherence for phenomena recorded on four spacecraft that are separated by a few hundred kilometers for structures over the whole range of apparent frequencies from 1 mHz to 9 kHz. This presents completely new opportunities to study spatialtemporal plasma phenomena from the magnetosphere out to the solar wind. A new probe environment was constructed for the CLUSTER electric field experiment that now produces data of unprecedented quality. Determination of plasma flow in the solar wind is an example of the capability of the instrument.

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The Digital Wave-Processing Experiment on Cluster

Cited by 29 publications

References 2 publications

On the fine structure of dipolarization fronts

On the fine structure of dipolarization fronts

A statistical study of the cross‐shock electric potential at low Mach number, quasi‐perpendicular bow shock crossings using Cluster data

First results of electric field and density observations by Cluster EFW based on initial months of operation

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