Dispersion analysis of ULF waves in the foreshock using cluster data and the wave telescope technique

Narita, Yasuhito; Glaßmeier, K. H.; Schäfer, Stefan; Motschmann, U.; Sauer, K.; Dandouras, I.; Fornaçon, K.‐H.; Georgescu, E.; Rème, H.

doi:10.1029/2003gl017432

Cited by 43 publications

(55 citation statements)

References 12 publications

(17 reference statements)

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“…In observations the waves are often termed as the Alfvén waves, as they propagate along the background magnetic field. The experimentally determined dispersion relations confirm the magnetosonic/whistler branch (Narita et al, 2003;Narita and Glassmeier, 2005).…”

Section: Origin Of Foreshock Wavessupporting

confidence: 61%

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Observations of linear and nonlinear processes in the foreshock wave evolution

Narita

Glaßmeier

Fränz

et al. 2007

Nonlin. Processes Geophys.

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Abstract. Waves in the foreshock region are studied on the basis of a hypothesis that the linear process first excites the waves and further wave-wave nonlinearities distribute scatter the energy of the primary waves into a number of daughter waves. To examine this wave evolution scenario, the dispersion relations, the wave number spectra of the magnetic field energy, and the dimensionless cross helicity are determined from the observations made by the four Cluster spacecraft. The results confirm that the linear process is the ion/ion righthand resonant instability, but the wave-wave interactions are not clearly identified. We discuss various reasons why the test for the wave-wave nonlinearities fails, and conclude that the higher order statistics would provide a direct evidence for the wave coupling phenomena.

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Section: Origin Of Foreshock Wavessupporting

confidence: 61%

“…(Narita et al, 2003(Narita et al, , 2006Narita and Glassmeier, 2005). The results of the dispersion analysis imply that a certain linear, micro-instability process is operating and reorganizing the beam-beam velocity distribution.…”

Section: Origin Of Foreshock Wavesmentioning

confidence: 97%

Observations of linear and nonlinear processes in the foreshock wave evolution

Narita

Glaßmeier

Fränz

et al. 2007

Nonlin. Processes Geophys.

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“…Pinçon and Lefeuvre (1991) expanded the method to include multidimensional (vectorial) observables and Motschmann et al (1996) further developed it in order to apply it to multipoint satellite measurements (e.g. Glassmeier et al, 2001;Narita et al, 2003;Constantinescu et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Statistical analysis of ground based magnetic field measurements with the field line resonance detector

et al. 2008

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Abstract. In this paper we introduce the field line resonance detector (FLRD), a wave telescope technique which has been specially adapted to estimate the spectral energy density of field line resonance (FLR) phase structures in a superposed wave field. The field line resonance detector is able to detect and correctly characterize several superposed FLR structures of a wave field and therefore constitutes a new and powerful tool in ULF pulsation studies. In our work we derive the technique from the classical wave telescope beamformer and present a statistical analysis of one year of ground based magnetometer data from the Canadian magnetometer network CANOPUS, now known as CARISMA. The statistical analysis shows that the FLRD is capable of detecting and characterizing superposed or hidden FLR structures in most of the detected ULF pulsation events; the one year statistical database is therefore extraordinarily comprehensive. The results of this analysis confirm the results of previous FLR characterizations and furthermore allow a detailed generalized dispersion analysis of FLRs.

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“…These observations were analysed already by Narita et al (2007) using the well-established and thoroughly tested wave telescope analysis method (e.g. Neubauer and Glassmeier, 1990;Motschmann et al, 1996;Glassmeier et al, 2001;Narita et al, 2003) to study the dispersion of foreshock waves. We may thus validate the wave surveyor approach by comparing our results with the findings of Narita et al (2007).…”

Section: Application To Cluster Fgm Observations Of Foreshock Wavesmentioning

confidence: 99%

“…Capon et al, 1967;Capon, 1969;Cox, 1973), and are commonly referred to as Capon estimators, minimum variance estimators, high resolution beamformers or simply beamformers. Minimum variance estimators have been used to identify MHD waves in the magnetosheath and the foreshock region Narita et al, 2003;Narita and Glassmeier, 2005) and to study turbulence (Sahraoui et al, 2003(Sahraoui et al, , 2006Narita et al, 2006). Furthermore, Constantinescu et al (2007) constructed a wave detection scheme based on spherical waves instead of plane waves to identify not only wave vectors but also the location of the wave source.…”

Section: Introductionmentioning

confidence: 99%

The wave surveyor technique for fast plasma wave detection in multi-spacecraft data

2008

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Abstract. Multi-satellite missions like Cluster allow to study the full spatio-temporal variability of plasma processes in near-Earth space, and both the frequency and the wave vector dependence of dispersion relations can be reconstructed. Existing wave analysis methods include high-resolution beamformers like the wave telescope or k-filtering technique, and the phase differencing approach that combines the correlations measured at pairs of sensors of the spacecraft array. In this paper, we make use of the eigendecomposition of the cross spectral density matrix to construct a direct wave identification method that we choose to call the wave surveyor technique. The analysis scheme extracts only the dominant wave mode but is much faster to apply than existing techniques, hence it is expected to ease survey-type detection of waves in large data sets. The wave surveyor technique is demonstrated by means of synthetic data, and is also applied to Cluster magnetometer measurements.

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Dispersion analysis of ULF waves in the foreshock using cluster data and the wave telescope technique

Cited by 43 publications

References 12 publications

Observations of linear and nonlinear processes in the foreshock wave evolution

Observations of linear and nonlinear processes in the foreshock wave evolution

Statistical analysis of ground based magnetic field measurements with the field line resonance detector

The wave surveyor technique for fast plasma wave detection in multi-spacecraft data

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