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  • 1
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    First results obtained by the Cluster STAFF experiment
    Copernicus GmbH ; 2003
    In:  Annales Geophysicae Vol. 21, No. 2 ( 2003-02-28), p. 437-456
    Details
    In: Annales Geophysicae, Copernicus GmbH, Vol. 21, No. 2 ( 2003-02-28), p. 437-456
    Abstract: Abstract. The Spatio Temporal Analysis of Field Fluctuations (STAFF) experiment is one of the five experiments, which constitute the Cluster Wave Experiment Consortium (WEC). STAFF consists of a three-axis search coil magnetometer to measure magnetic fluctuations at frequencies up to 4 kHz, a waveform unit (up to either 10 Hz or 180 Hz) and a Spectrum Analyser (up to 4 kHz). The Spectrum Analyser combines the 3 magnetic components of the waves with the two electric components measured by the Electric Fields and Waves experiment (EFW) to calculate in real time the 5 × 5 Hermitian cross-spectral matrix at 27 frequencies distributed logarithmically in the frequency range 8 Hz to 4 kHz. The time resolution varies between 0.125 s and 4 s. The first results show the capabilities of the experiment, with examples in different regions of the magnetosphere-solar wind system that were encountered by Cluster at the beginning of its operational phase. First results obtained by the use of some of the tools that have been prepared specifically for the Cluster mission are described. The characterisation of the motion of the bow shock between successive crossings, using the reciprocal vector method, is given. The full characterisation of the waves analysed by the Spectrum Analyser, thanks to a dedicated program called PRASSADCO, is applied to some events; in particular a case of very confined electromagnetic waves in the vicinity of the equatorial region is presented and discussed.Key words. Magnetospheric physics (magnetopause, cusp and boundary layer) – Space plasma physics (waves and instabilities; shock waves)
    Type of Medium: Online Resource
    ISSN: 1432-0576
    URL: Article
    DOI: 10.5194/angeo-21-437-2003
    Language: English
    Publisher: Copernicus GmbH
    Publication Date: 2003
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  • 2
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    Ulysses Radio and Plasma Wave Observations in the Jupiter Environment
    American Association for the Advancement of Science (AAAS) ; 1992
    In:  Science Vol. 257, No. 5076 ( 1992-09-11), p. 1524-1531
    Details
    In: Science, American Association for the Advancement of Science (AAAS), Vol. 257, No. 5076 ( 1992-09-11), p. 1524-1531
    Type of Medium: Online Resource
    ISSN: 0036-8075 , 1095-9203
    URL: Article
    DOI: 10.1126/science.257.5076.1524
    RVK:
    TA 1000
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    WA 15000
    Language: English
    Publisher: American Association for the Advancement of Science (AAAS)
    Publication Date: 1992
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  • 3
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    Wave‐particle interactions near Ω He+ observed on GEOS 1 and 2 1. Propagation of ion cyclotron waves in He + ‐rich plasma
    American Geophysical Union (AGU) ; 1981
    In:  Journal of Geophysical Research: Space Physics Vol. 86, No. A8 ( 1981-08), p. 6755-6772
    Details
    In: Journal of Geophysical Research: Space Physics, American Geophysical Union (AGU), Vol. 86, No. A8 ( 1981-08), p. 6755-6772
    Abstract: The GEOS 1 and 2 spacecraft contain a set of particle and wave detectors which allow for a very comprehensive study of wave‐particle interactions occurring within the equatorial region of the magnetosphere. This paper is devoted to interactions involving protons in the energy range 20 keV to 300 keV and ULF waves with frequencies below the proton gyrofrequency. It is shown that most of the ion cyclotron waves (ICW's) detected in this frequency range have spectra whose characteristic frequencies are organized in the vicinity of the He + gyrofrequency. Simultaneous measurements of the ion composition in the thermal energy range ( E ≲110 eV) show these waves to be clearly associated with the abundance of cold He + as well as the anisotropy of ions above 20 keV. The general characteristics of these helium‐associated ULF events are presented in case studies of four events. The interpretation of this phenomenon is given in the present paper in terms of the propagation of ICW's in a He + ‐rich plasma. It is shown that the shape of the cold plasma dispersion curve (for both parallel and non‐parallel propagation) can adequately explain the main characteristics of the observed waves (frequency spectrum, polarization) as well as the differences between observations made onboard GEOS 1 and GEOS 2. The generation conditions of ion cyclotron waves in such a multi‐component plasma, as well as their quasi‐linear effects on both the cold He + ions and the hot protons, are discussed in a companion paper.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/JA086iA08p06755
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1981
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  • 4
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    ULF waves observed with magnetic and electric sensors on GEOS-1
    Springer Science and Business Media LLC ; 1978
    In:  Space Science Reviews Vol. 22, No. 4 ( 1978-10), p. 347-369
    Details
    In: Space Science Reviews, Springer Science and Business Media LLC, Vol. 22, No. 4 ( 1978-10), p. 347-369
    Type of Medium: Online Resource
    ISSN: 0038-6308 , 1572-9672
    URL: Article
    DOI: 10.1007/BF00210873
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 1978
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  • 5
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    Magnetosonic waves above f c (H + ) at geostationary orbit: GEOS 2 results
    American Geophysical Union (AGU) ; 1990
    In:  Journal of Geophysical Research: Space Physics Vol. 95, No. A7 ( 1990-07), p. 10609-10621
    Details
    In: Journal of Geophysical Research: Space Physics, American Geophysical Union (AGU), Vol. 95, No. A7 ( 1990-07), p. 10609-10621
    Abstract: The fast magnetosonic waves in the frequency range 1–11 Hz (i.e., above the proton gyrofrequency Ω p ) are considered. The electric wave field δ E (mostly less than 0.5 mV/m) has an elliptic polarization in the plane perpendicular to B . While the magnetic wave field δ B is strictly polarized along the ambient magnetic field, the ellipticity and the sense of rotation of the electric field polarization ellipses are crucial parameters for the identification of the wave mode. The waves are right‐hand polarized, and the ellipticity is usually about 0.2. The main axis of the ellipse is close to the azimuthal direction. The wave vector k is almost parallel to δ E , and thus the fast magnetosonic waves propagate at small angles to the azimuthal direction. The wavelengths are usually between 150 and 300 km. The δ E /δ B ratio of the waves is between ν A and υ A (1 + ω²/Ω p ²) 1/2 , where υ A is the Alfvén velocity. In one case a burst of pure electrostatic modes near the second harmonic of the proton gyrofrequency was observed.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/JA095iA07p10609
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1990
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  • 6
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    ULF waves in the Io torus: Ulysses observations
    American Geophysical Union (AGU) ; 1993
    In:  Journal of Geophysical Research: Space Physics Vol. 98, No. A12 ( 1993-12), p. 21151-21162
    Details
    In: Journal of Geophysical Research: Space Physics, American Geophysical Union (AGU), Vol. 98, No. A12 ( 1993-12), p. 21151-21162
    Abstract: Throughout the Io torus, Ulysses has observed intense ULF wave activity in both electric and magnetic components. Such ULF waves have been previously suggested as the source of ion precipitation leading to Jovian aurorae. The peaks of the wave spectra are closely related to the ion cyclotron frequencies, which is evidence of the waves being ion cyclotron waves (ICWs). Analysis of the dispersion relation using a multicomponent density model shows that at high latitudes (∼ 30°), peak frequencies of the waves fall into L mode branches of guided or unguided ICWs. Near the equator, in addition to the ICWs below fnof; c O ++, there are strong signals at ∼10 Hz which require an unexpectedly large energetic ion temperature anisotropy to be explained by the excitation of either convective or nonconvective ion cyclotron instabilities. Their generation mechanism remains open for the future study. Evaluation of the Poynting vector and the dispersion relation analysis suggest that the waves near the equator had a small wave angle relative to the magnetic field, while those observed at high latitudes were more oblique. The polarization of the waves below fnof; c H + is more random than that of the whistler mode waves, but left‐hand‐polarized components of the waves can still be seen. The intensity of the ICWs both near the equator and at high latitudes are strong enough to meet the requirement for producing strong pitch angle scattering of energetic ions.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/93JA02593
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1993
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  • 7
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    Wave‐particle interactions near Ω He + observed on board GEOS 1 and 2: 2. Generation of ion cyclotron waves and heating of He + ions
    American Geophysical Union (AGU) ; 1982
    In:  Journal of Geophysical Research: Space Physics Vol. 87, No. A10 ( 1982-10), p. 8174-8190
    Details
    In: Journal of Geophysical Research: Space Physics, American Geophysical Union (AGU), Vol. 87, No. A10 ( 1982-10), p. 8174-8190
    Abstract: This work is a continuation of paper 1 (Young et al., 1981) and is devoted to the generation process of ion cyclotron waves (ICWs) and the acceleration of He + ions up to suprathermal energies. Simultaneous measurements are used from the ion composition experiment (0 〈 E 〈 16 keV), the energetic particle experiment (24 〈 E 〈 3 300 keV), and the ULF wave experiment (0.2–10 Hz) on board the GEOS 1 and GEOS 2 spacecraft. General characteristics of the local time distribution of ICWs will be presented and compared with those of the thermal anisotropy of energetic protons and the He + abundance. Further calculations of the convective growth rate are conducted by applying two different methods, both of which are based upon the measured proton fluxes. The generation conditions of the ICWs in the presence of He + ions will be investigated and three possible explanations will be discussed: (1) enhanced convection growth rates, (2) lowering of the threshold for absolute instabilities, and (3) change of the ICWs ray path (laser‐like effect). Finally, it is shown that the flux of suprathermal He + ions is modulated at the ICW frequency. Owing to nonlinear effects, part of the energy of the energetic protons is transfered via the ICWs to the He + ions that are essentially accelerated in the direction perpendicular to the static magnetic field. Then in the otherwise collisionless plasma the friction between energetic anisotropic protons and thermal He + ions is achieved through the ICWs.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/JA087iA10p08174
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1982
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  • 8
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    Observations of electron plasma waves upstream of the Jovian bow shock
    Elsevier BV ; 1993
    In:  Planetary and Space Science Vol. 41, No. 11-12 ( 1993-11), p. 811-822
    Details
    In: Planetary and Space Science, Elsevier BV, Vol. 41, No. 11-12 ( 1993-11), p. 811-822
    Type of Medium: Online Resource
    ISSN: 0032-0633
    URL: Article
    DOI: 10.1016/0032-0633(93)90088-J
    Language: English
    Publisher: Elsevier BV
    Publication Date: 1993
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  • 9
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    Correlation between terrestrial myriametric and kilometric radio bursts observed with Galileo
    American Geophysical Union (AGU) ; 1994
    In:  Journal of Geophysical Research: Space Physics Vol. 99, No. A12 ( 1994-12), p. 23541-23546
    Details
    In: Journal of Geophysical Research: Space Physics, American Geophysical Union (AGU), Vol. 99, No. A12 ( 1994-12), p. 23541-23546
    Abstract: Data from the Galileo plasma wave system recorded during an investigation of the Earth magnetotail on December 8, 1990, are analyzed in both the myriametric and the kilometric wavelength range. In the far tail, between 80 and 30 Earth radii, two components are observed in the myriametric range (frequencies between 6 and about 30 kHz): (1) the “classical” trapped continuum radiation with a smoothly varying intensity in time and (2), superposed on this component, bursts of waves with typical spectral densities of 10 −15 V²m −2 Hz −1 . These bursts of myriametric waves are shown B to correlate with bursts of intense auroral kilometric radiation (AKR) with typical spectral density of 10 −12 V²m −2 Hz −1 . This bursty myriametric radiation is the analog of the low frequency radiation (LFR) reported by Filbert and Kellog (1989). Its close correlation with the kilometric radiation suggests the existence of a direct relationship between these two radiations. A generation mechanism that explains this correlation and the frequency gap between the AKR and the LFR is proposed.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/94JA00922
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1994
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  • 10
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    Ion cyclotron waves: Direct comparison between ground‐based measurements and observations in the source region
    American Geophysical Union (AGU) ; 1984
    In:  Journal of Geophysical Research: Space Physics Vol. 89, No. A1 ( 1984-01), p. 195-202
    Details
    In: Journal of Geophysical Research: Space Physics, American Geophysical Union (AGU), Vol. 89, No. A1 ( 1984-01), p. 195-202
    Abstract: Simultaneous measurements of ion cyclotron waves (ICW's) were performed on GEOS spacecraft and in the vicinity of their magnetic footprints with the French Mobile station. The detailed comparison between the two sets of data shows that while ICW's having F 〈 F He , the He + gyrofrequency at the equator, generally propagate to the ground, only 50% of those generated above F He can reach the ground station. It is shown that these results are in good agreement with the conclusions that Rauch and Roux [1982] drew on the basis of measurements reported by Young et al. [1981] . In an He + ‐rich plasma, ICW's with F 〉 F He suffer a reflection where the frequency locally matches the local bi‐ion hybrid frequency. We extend the calculations of Rauch and Roux and calculate, as a function of the He + concentration, the tunnelling of ICW's through the stopband induced by the presence of minor He + ions. It is shown that the transmission coefficient strongly depends upon the wave frequency for a given He + abundance ratio. The results obtained are shown to be supported by existing observations.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/JA089iA01p00195
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1984
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