The Cluster Magnetic Field Investigation

Balogh, A.; Dunlop, M. W.; Cowley, S. W. H.; Southwood, D. J.; Thomlinson, J. G.; Glaßmeier, K.‐H.; Musmann, G.; Lühr, H.; Buchert, Stephan; Acuña, M. H.; Fairfield, D. H.; Slavin, J. A.; Riedler, W.; Schwingenschuh, K.; Kivelson, M. G.

doi:10.1007/978-94-011-5666-0_3

Cited by 322 publications

(244 citation statements)

References 19 publications

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“…The crossing of the magnetopause by the spacecraft was about 35 min before. The FGM data are sampled at 23 Hz, and allow one to access the continuous components of the magnetic field (Balogh et al, 1997). These continuous components are removed from the signal and used to define the Magnetic Field Aligned (MFA) frame, in which this study is performed.…”

Section: Observationsmentioning

confidence: 99%

Magnetic turbulent spectra in the magnetosheath: new insights

Sahraoui¹,

Belmont²,

Pinçon

et al. 2004

Ann. Geophys.

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Abstract. The spectrum of the magnetic fluctuations measured by the Cluster satellites in the inner magnetosheath is investigated using the k-filtering technique. On a case study, it is shown first that the wave vectors calculated from the Flux Gate Magnetometer (FGM) data fit well with those determined from the Spatio-Temporal Analysis of Field Fluctuations (STAFF) data for their common range of frequency, which allows one to confirm that the high pass filter applied to STAFF data does not alter the spatial characteristics of its spectra. Both analyses confirm the dominance of the mirror mode for frequencies up to 1.4 Hz. Furthermore, by comparing the experimental charateristics of the identified mirror mode to the prediction of the linear theory, it is shown that the predicted maximum growth rate is observed in the frequency range 0-0.15 Hz, i.e. the FGM range. All the rest of the mirror mode, identified for higher frequencies is more likely to be a non linear extension of the most instable one. This cascade on the spatial scales is, in turn, observed in the satellite frame as a temporal spread due to Doppler shift. Further implications on the real nature of the observed spectrum are discussed.

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Section: Observationsmentioning

confidence: 99%

Magnetic turbulent spectra in the magnetosheath: new insights

Sahraoui¹,

Belmont²,

Pinçon

et al. 2004

Ann. Geophys.

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“…This implies that the estimate of the actual solar wind electric field in the satellite spin plane will be overestimated. Magnetic field data from the fluxgate magnetometer (FGM) (Balogh et al, 1997), have been used to identify the shock regions and therefore, put the electric field observations into context. These data have a sampling frequency of 5Hz.…”

Section: Datamentioning

confidence: 99%

Electric field scales at quasi-perpendicular shocks

et al. 2004

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Abstract. This paper investigates the short scale structures that are observed in the electric field during crossings of the quasi-perpendicular bow shock using data from the Cluster satellites. These structures exhibit large amplitudes, as high as 70 mVm −1 and so make a significant contribution to the overall change in potential at the shock front. It is shown that the scale size of these short-lived electric field structures is of the order of a few c/ω pe . The relationships between the scale size and the upstream Mach number and θ Bn are studied. It is found that the scale size of these structures decreases with increasing plasma β and as θ Bn → 90 • . The amplitude of the spikes remains fairly constant with increasing M a and appears to increase as θ Bn → 90 • .

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“…The electron plasma density N is determined from the satellite potential measured by the EFW experiment with sampling rate 5 s À1 [Gustafsson et al, 2001]. The magnetic field is sampled at rate 22 s À1 and is provided by the FGM team [Balogh et al, 2001]. The observed plasma parameters during these events are: V A % 60 km/s, thermal ion gyroradius about 100 km, l i % 40 km and ion b % 10.…”

Section: Observationsmentioning

confidence: 99%

Reinterpretation of mirror modes as trains of slow magnetosonic solitons

Stasiewicz

2004

Geophysical Research Letters

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[1] It is shown that large amplitude periodic oscillations of the magnetic field measured frequently by spacecraft in the magnetosheath, and interpreted as mirror-mode waves/ structures, represent trains of slow-mode magnetosonic solitons. Nonlinear magnetosonic wave-trains with properties attributed previously to mirror-mode structures are obtained as exact solutions of Hall-MHD equations with anisotropic ion pressure. The theoretically derived properties of magnetosonic solitons are compared with multipoint measurements on Cluster satellites in the magnetosheath with plasma beta (plasma/magnetic pressure) $10. The computed properties of nonlinear waves: amplitudes, spatial scales, periodicity, and propagation velocities are consistent with in situ measurements in space.

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The Cluster Magnetic Field Investigation

Cited by 322 publications

References 19 publications

Magnetic turbulent spectra in the magnetosheath: new insights

Magnetic turbulent spectra in the magnetosheath: new insights

Electric field scales at quasi-perpendicular shocks

Reinterpretation of mirror modes as trains of slow magnetosonic solitons

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