The Cluster Spatio-Temporal Analysis of Field Fluctuations (Staff) Experiment

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:10.1007/978-94-011-5666-0_5

Cited by 85 publications

(98 citation statements)

References 45 publications

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“…STAFF-SA was designed for onboard calculation of power-spectral densities, mutual phases, and coherence relations of three orthogonal magnetic components and two electric components (Cornilleau-Wehrlin et al, 1997. The analysis is made in 27 frequency channels between 8 Hz and 4 kHz, and the instrument has several measurement modes.…”

Section: Data Set and Analysis Methodsmentioning

confidence: 99%

Systematic analysis of equatorial noise below the lower hybrid frequency

et al. 2004

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Abstract.We report results of a systematic analysis of a large number of observations of equatorial noise between the local proton cyclotron frequency and the local lower hybrid frequency. The analysis is based on the data collected by the STAFF-SA instruments on board the four Cluster spacecraft. The data set covers their first two years of measurement in the equatorial magnetosphere at radial distances between 3.9 and 5 Earth radii. Inspection of 781 perigee passages shows that the occurrence rate of equatorial noise is approximately 60%. We identify equatorial noise by selecting data with nearly linearly polarized magnetic field fluctuations. These waves are found within 10 • of the geomagnetic equator, consistent with the published past observations. Our results show that equatorial noise has the most intense magnetic field fluctuations among all the natural emissions in the given interval of frequencies and latitudes. Electric field fluctuations of equatorial noise are also more intense compared to the average of all detected waves. Equatorial noise thus can play a non-negligible role in the dynamics of the internal magnetosphere.

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Section: Data Set and Analysis Methodsmentioning

confidence: 99%

Systematic analysis of equatorial noise below the lower hybrid frequency

et al. 2004

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“…Electric field spectrograms from 2 to 80 kHz are provided by the Waves of HIgh frequency and Sounder for Probing of Electron density by Relaxation (WHISPER) experiment (Décréau et al, 1997). Below 4 kHz, electric and magnetic spectra are provided by the Spatio-Temporal Analysis of Field Fluctuations (STAFF) experiment (Cornilleau-Wehrlin et al, 1997). The WideBanD (WBD) experiment provides very high-rate digital samples of electric and magnetic waveforms in three possible frequency bands, 25 Hz-9.5 kHz, 50 Hz-19 kHz, and 1 kHz-77 kHz (Gurnett et al, 1997).…”

Section: Cluster Instruments and Data Products Usedmentioning

confidence: 99%

Cluster observations of mid-latitude hiss near the plasmapause

et al. 2004

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Abstract. In the vicinity of the plasmapause, around the geomagnetic equator, the four Cluster satellites often observe banded hiss-like electromagnetic emissions (BHE); below the electron gyrofrequency but above the lower hybrid resonance, from 2 kHz to 10 kHz. We show that below 4 kHz, these waves propagate in the whistler mode. Using the first year of scientific operations of WHISPER, STAFF and WBD wave experiments on Cluster, we have identified the following properties of the BHE waves: (i) their location is strongly correlated with the position of the plasmapause, (ii) no MLT dependence has been found, (iii) their spectral width is generally 1 to 2 kHz, and (iv) the central frequency of their emission band varies from 2 kHz to 10 kHz. All these features suggest that BHE are in fact mid-latitude hiss emissions (MLH). Moreover, the central frequency was found to be correlated with the K p index. This suggests either that these banded emissions are generated in a given f/f ce range, or that there is a K p dependent Doppler shift between the satellites and a possible moving source of the MLH.

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“…Note the very fast magnetosheath flow along the magnetospheric boundary, and hence the large flow shear across it (650 km/s and more). Figure 4 shows CIS/HIA ion density (only Cluster 1 and 3), PEACE electron density (Johnstone et al, 1997), FGM magnetic field strength, WHISPER electric wave intensity in the 2-80 kHz band (Décréau et al, 1997), STAFF perpendicular magnetic wave intensity in the 0.3-10 Hz band (Cornilleau-Wehrlin et al, 1997), EFW spacecraft potential (Gustafsson et al, 1997), and the CIS/HIA plasma velocity along x and y in the nonmoving frame. All data were used at spin resolution, about 4 s. (The 213 ms resolution WHISPER data were resampled after applying a 0.25 Hz low band-pass filter.)…”

Section: An Example Of 2-d Reconstructionmentioning

confidence: 99%

Reconstruction of the magnetopause and low-latitude boundary layer topology using Cluster multi-point measurements

et al. 2004

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Abstract. Multi-spacecraft data from Cluster allow for a more detailed magnetopause and boundary layer structure determination than ever before. Reconstruction methods, in which the time variability observed during a pass is interpreted as being due to boundary motion and/or spatial structure, are particularly well suited for this task. Such methods rely on the availability of plasma and field data and adopt the tangential discontinuity hypothesis to determine the motion, acceleration, boundary structure, boundary curvature and surface wave speed over an extended time interval. In this paper one-and two-dimensional reconstruction methods are applied to multi-spacecraft data for the first time.

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The Cluster Spatio-Temporal Analysis of Field Fluctuations (Staff) Experiment

Cited by 85 publications

References 45 publications

Systematic analysis of equatorial noise below the lower hybrid frequency

Systematic analysis of equatorial noise below the lower hybrid frequency

Cluster observations of mid-latitude hiss near the plasmapause

Reconstruction of the magnetopause and low-latitude boundary layer topology using Cluster multi-point measurements

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