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Cornilleau‐Wehrlin, N.; Chauveau, P.; Louis, Sony Achmad; Meyer, Andrea; Nappa, J. M.; Perraut, S.; Rezeau, Laurence; Robert, P.; Roux, A.; Villedary, C. de; Conchy, Y. de; Friel, L.; Harvey, C. C.; Hubert, D.; Lacombe, Catherine; Manning, Robert E.; Wouters, F.; Lefeuvre, F.; Parrot, M.; Pinçon, Jean-Louis; Poirier, B.; Kofman, W.; Louarn, P.

doi:10.1023/a:1004979209565

Cited by 150 publications

(43 citation statements)

References 53 publications

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“…We use Cluster data from the Fluxgate Magnetometer (FGM, 22 samples s −1 ; Balogh et al 1997), the Electric Field and Wave experiment (EFW, 25 samples s −1 ; Gustafsson et al 1997), and the SpatioTemporal Analysis of Field Fluctuation experiment-Spectrum Analyzer (STAFF-SA, 8 Hz-4 k Hz; Cornilleau-Wehrlin et al 1997). At full resolution, these instruments ensure a full coverage of spectral frequencies between MHD and electron scales for typical magnetosheath plasma conditions with a switch-over of the detectors at around 10 Hz (e.g.…”

Section: Discussionmentioning

confidence: 99%

Electric and magnetic spectra from MHD to electron scales in the magnetosheath

Matteini

Alexandrova

Chen

et al. 2016

Mon. Not. R. Astron. Soc.

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We investigate the transition of the turbulence from large to kinetic scales using Cluster observations. Simultaneous spectra of magnetic and electric fields in the Earth's magnetosheath from magnetohydrodynamic (MHD) to electron scales are presented for the first time. While the two spectra have approximatively similar behaviour in the fluid-MHD regime, they show different trends in the kinetic range. As the magnetic field spectrum steepens at ion scales, the electric field spectrum is characterized by a shallower power law continuing down to electron scales. Such an evolution is consistent with theoretical expectations, assuming that the turbulence is dominated by highly oblique k-vectors and that between ion and electron scales the electric field is governed by the non-ideal terms in the generalized Ohm's law. This leads to an expected linear increase of the electric-to-magnetic ratio of fluctuations, consistent with observations presented here. The influence of local whistler wave activity on electron-scale spectra is also discussed.

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Section: Discussionmentioning

confidence: 99%

Electric and magnetic spectra from MHD to electron scales in the magnetosheath

Matteini

Alexandrova

Chen

et al. 2016

Mon. Not. R. Astron. Soc.

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“…This study makes use of data from a number of experiments on board the Cluster spacecraft, including PEACE (Johnstone et al, 1997;Fazakerley et al, 2010), the Fluxgate Magnetometer (FGM) (Balogh et al, 1997;Gloag et al, 2010), the Electric Field and Waves (EFW) experiment (Gustafsson et al, 1997;Khotyaintsev et al, 2010), the Waves of High frequency and Sounder for Probing of Electron density by Relaxation (WHISPER) (Décréau et al, 1997;Trotignon et al, 2010), and the Spatio-Temporal Analysis of Field Fluctuations (STAFF) experiment (Cornilleau-Wehrlin et al, 1997.…”

Section: Datamentioning

confidence: 99%

Absence of the strahl during times of slow wind

Gurgiolo¹,

Goldstein

2017

Ann. Geophys.

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Abstract. It is not uncommon during periods when the solar wind speed is less than 425 km s −1 to observe near 1 AU no evidence of a strahl population in either the electron solar wind or within the foreshock. Estimating the fluid flow within each energy step returned from the Plasma Electron And Current Experiment (PEACE) on board Cluster-2 often finds that in slow wind the GSE spherical flow angles in energies above where there is a clear core/halo signature are often close to radial with no evidence of a field-aligned flow. This signifies the lack of a strahl presence in the electron velocity distribution function (eVDF). When there is no obvious strahl signature in the data, the electrons above the core/halo in energy appear to be unstructured and smeared in angle. This can either be interpreted as due to statistical noise in low counting rate situations or the result of intense scattering. Regions where the strahl is seen and not seen are often separated by a very thin boundary layer. These transitions in the spacecraft frame of reference can be quite rapid, generally occurring within one to two spins (4-8 s).

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“…In order to study waves at higher frequencies in and around LHCs, data from the Spectrum Analyzer of the SpatioTemporal Analysis of Field Fluctuations (STAFF-SA) instrument (Cornilleau-Wehrlin et al, 1997) are also used. This instrument provides on-board analysis of three magnetic and two electric wave field components up to 4 kHz.…”

Section: Clustermentioning

confidence: 99%

Observations of lower hybrid cavities in the inner magnetosphere by the Cluster and Viking satellites

et al. 2004

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Abstract.Observations by the Viking and Cluster satellites at altitudes up to 35 000 km show that Lower Hybrid Cavities (LHCs) are common in the inner magnetosphere. LHCs are density depletions filled with waves in the lower hybrid frequency range. The LHCs have, until recently, only been found at altitudes up to 2000 km. Statistics of the locations and general shape of the LHCs is performed to obtain an overview of some of their properties. In total, we have observed 166 LHCs on Viking during 27 h of data, and 535 LHCs on Cluster during 87 h of data. These LHCs are found at invariant latitudes from the auroral region to the plasmapause. A comparison with lower altitude observations shows that the LHC occurrence frequency does not scale with the flux tube radius, so that the LHCs are moderately rarer at high altitudes. This indicates that the individual LHCs do not reach from the ionosphere to 35 000 km altitude, which gives an upper bound for their length. The width of the LHCs perpendicular to the geomagnetic field at high altitudes is a few times the ion gyroradius, consistent with observations at low altitudes. The estimated depth of the density depletions vary with altitude, being larger at altitudes of 20 000-35 000 km (Cluster, 10-20%), smaller around 1500-13 000 km (Viking and previous Freja results, a few percent) and again larger around 1000 km (previous sounding rocket observations, 10-20%). The LHCs in the inner magnetosphere are situated in regions with background electrostatic hiss in the lower hybrid frequency range, consistent with investigations at low altitudes. Individual LHCs observed at high altitudes are stable at least on time scales of 0.2 s (about the ion gyro period), which is consistent with previous results at lower altitudes, and observations by the four Cluster satellites show that the occurrence of LHCs in a region in space is a stable phenomenon, at least on time scales of an hour.

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Cited by 150 publications

References 53 publications

Electric and magnetic spectra from MHD to electron scales in the magnetosheath

Electric and magnetic spectra from MHD to electron scales in the magnetosheath

Absence of the strahl during times of slow wind

Observations of lower hybrid cavities in the inner magnetosphere by the Cluster and Viking satellites

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