Multi-spacecraft observations of broadband waves near the lower hybrid frequency at the Earthward edge of the magnetopause

André, Mats; Behlke, R.; Wahlund, Jan‐Erik; Vaivads, A.; Eriksson, Anders; Tjulin, Anders; Carozzi, T. D.; Cully, C. M.; Gustafsson, G.; Sundkvist, D.; Khotyaintsev, Yuri V.; Cornilleau‐Wehrlin, N.; Rezeau, Laurence; Maksimović, M.; Lucek, E.; Balogh, A.; Dunlop, M. W.; Lindqvist, Per-Arne; Mozer, F. S.; Pedersen, Å.; Fazakerley, A. N.

doi:10.5194/angeo-19-1471-2001

Cited by 40 publications

(28 citation statements)

References 38 publications

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“…More recent work include kinetic theory 20 of plasmoid propagation in magnetic fields, and also particle-in-cell simulations and laboratory experiments [21][22][23][24] on waves in the lower hybrid frequency range in penetrating plasmoids. Such waves have also been observed at the magnetopause 25 .…”

Section: Introductionmentioning

confidence: 61%

Plasma penetration of the dayside magnetopause

et al. 2012

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Data from the Cluster spacecraft during their magnetopause crossing on 25 January 2002 are presented. The magnetopause was in a state of slow non-oscillatory motion during the observational period. Coherent structures of magnetosheath plasma, here typified as plasmoids, were seen on closed magnetic field lines on the inside of the magnetopause. Using simultaneous measurements on two spacecraft the inward motion of the plasmoids is followed from one spacecraft to the next, and it is found to be in agreement with the measured ion velocity. The plasma characteristics and the direction of motion of the plasmoids show that they have penetrated the magnetopause, and the observations are consistent with the concept of impulsive penetration, as it is known from theory, simulations, and laboratory experiments. The mean flux across the magnetopause observed was 0.2-0.5% of the solar wind flux at the time, and the peak values of the flux inside the plasmoids reached approximately 20% of the solar wind flux.

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Section: Introductionmentioning

confidence: 61%

Plasma penetration of the dayside magnetopause

et al. 2012

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“…In this paper, we present some of the first results from EFW and show some of the unique features of this instrument. EFW data are also analysed and presented in other papers in this issue (André et al, 2001;Pedersen et al, 2001). …”

Section: Introductionmentioning

confidence: 99%

First results of electric field and density observations by Cluster EFW based on initial months of operation

et al. 2001

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Abstract. Highlights are presented from studies of the electric field data from various regions along the CLUS-TER orbit. They all point towards a very high coherence for phenomena recorded on four spacecraft that are separated by a few hundred kilometers for structures over the whole range of apparent frequencies from 1 mHz to 9 kHz. This presents completely new opportunities to study spatialtemporal plasma phenomena from the magnetosphere out to the solar wind. A new probe environment was constructed for the CLUSTER electric field experiment that now produces data of unprecedented quality. Determination of plasma flow in the solar wind is an example of the capability of the instrument.

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“…Beyond verifying the existence of the excitation mechanism, Correspondence to: M. E. Koepke (mkoepke@wvu.edu) these comparisons reinforced detailed aspects of the theoretical model and also stimulated refinements and an expanded awareness of the details of the model. This new knowledge of how perpendicular-velocity shear substantially changes plasma stability is being used to interpret recent observations of extremely low frequency waves in the auroral zone of the ionosphere and magnetosphere 2000a;2000b;Bonnell et al, 1996;Bonnell, 1997;Lund et al, 1999;Hamrin et al, 2001;André et al, 2002). Here, we report on aspects of the dispersion relation heretofore unpredicted in the model.…”

Section: Introductionmentioning

confidence: 99%

Resonant-to-nonresonant transition in electrostatic ion-cyclotron wave phase velocity

Carroll

Koepke

Zintl

et al. 2003

Nonlin. Processes Geophys.

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Abstract. Because of the implications for plasmas in the laboratory and in space, attention has been drawn to inhomogeneous energy-density driven (IEDD) waves that are sustained by velocity-shear-induced inhomogeneity in crossfield plasma flow. These waves have a frequency ω r in the lab frame within an order of magnitude of the ion gyrofrequency ω ci , propagate nearly perpendicular to the magnetic field (k z /k ⊥ 1), and can be Landau resonant (0 < ω 1 /k z < ν d ) with a parallel drifting electron population (drift speed ν d ), where subscripts 1 and r indicate frequency in the frame of flowing ions and in the lab frame, respectively, and k z is the parallel component of the wavevector. A transition in phase velocity from 0 < ω 1 /k z < ν d to 0 > ω 1 /k z > ν d for a pair of IEDD eigenmodes is observed as the degree of inhomogeneity in the transverse E × B flow is increased in a magnetized plasma column. For weaker velocity shear, both eigenmodes are dissipative, i.e. in Landau resonance, with k z ν d > 0. For stronger shear, both eigenmodes become reactive, with one's wavevector component k z remaining parallel, but with ω 1 /k z > ν d , and the other's wavevector component k z becoming anti-parallel, so that 0 > ω 1 /k z . For both eigenmodes, the transition (1) involves a small frequency shift and (2) does not involve a sign change in the wave energy density, which is proportional to ω r ω 1 , both of which are previously unrecognized aspects of inhomogeneous energydensity driven waves.

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Multi-spacecraft observations of broadband waves near the lower hybrid frequency at the Earthward edge of the magnetopause

Cited by 40 publications

References 38 publications

Plasma penetration of the dayside magnetopause

Plasma penetration of the dayside magnetopause

First results of electric field and density observations by Cluster EFW based on initial months of operation

Resonant-to-nonresonant transition in electrostatic ion-cyclotron wave phase velocity

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