A case study of low-frequency waves at the magnetopause

Rezeau, Laurence; Sahraoui, Fouad; d’Humières, E.; Belmont, Gérard; Chust, T.; Cornilleau‐Wehrlin, N.; Mellul, Lidia; Alexandrova, Olga; Lucek, E.; Robert, P.; Décréau, Pierrette; Canu, P.; Dandouras, I.

doi:10.5194/angeo-19-1463-2001

Cited by 17 publications

(10 citation statements)

References 17 publications

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“…In the second case (right column), the rotation angle is large (around 100°) and there is a clear maximum in the fluctuation energy density at the MP crossing. The second case is quite similar to the case presented from Cluster spacecraft in work by Rezeau et al [2001]. The striking difference observed between the two cases tends to indicate that the behavior of the waves at the MP indeed depends on the rotation angle.…”

Section: Role Of the Magnetic Shear In The Mp Planesupporting

confidence: 78%

Power of magnetopause low‐frequency waves: A statistical study

Attié¹,

Rezeau²,

Belmont³

et al. 2008

J. Geophys. Res.

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[1] ULF fluctuations at the Earth magnetopause have been the subject of a long-standing interest because of their noticeable amplitude and their potential role in plasma penetration through the magnetosphere boundary. Some information on the nature of these fluctuations has already been provided thanks to GEOS and ISEE, and more recently Cluster, case studies and from a few statistical studies on magnetopause crossings. Here we present a new statistical study concerning the power of the ultralow frequency fluctuations based on the data of the Cluster-STAFF experiment. New insight in the properties of turbulence is obtained, because of the orbit of the Cluster spacecraft, which gives access to regions far from the subsolar point. The correlation of the wave power with solar wind and magnetosheath properties indicates that these fluctuations are controlled and possibly driven by external sources. Its correlation with the magnetopause properties (namely the magnetic shear angle) provides an indication of an amplification process at the boundary.

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Section: Role Of the Magnetic Shear In The Mp Planesupporting

confidence: 78%

Power of magnetopause low‐frequency waves: A statistical study

Attié¹,

Rezeau²,

Belmont³

et al. 2008

J. Geophys. Res.

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“…It is important to note, however, that monochromatic AIC and mirror modes, visible in Fourier spectrum as sharp peaks (see for example (Alexandrova et al, 2004)), are not frequently seen in the magnetosheath. Instead, most of the observations shows a broad band spectrum covering frequencies much higher than f ci (Siscoe et al, 1967;Rezeau et al, 1986Rezeau et al, , 1999Rezeau et al, , 2001Matsuoka et al, 2000;Shevyrev and Zastenker, 2005;Sahraoui et al, 2003aSahraoui et al, , 2006. Let us discuss more in details some features of magnetic fluctuations below and above f ci .…”

Section: The Earth Magnetosheathmentioning

confidence: 99%

Solar wind vs magnetosheath turbulence and Alfvén vortices

Alexandrova

2008

Nonlin. Processes Geophys.

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112

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Abstract. In this paper we give firstly a broad review of the space plasma turbulence around the ion characteristic space and temporal scales within two natural laboratories, the solar wind and the Earth magnetosheath. In both regions power law spectra of magnetic fluctuations are observed. In both regions these spectra have a break in the vicinity of the ion cyclotron frequency. A distinctive feature of the magnetosheath turbulence is the presence of Alfvén vortices at scales of the spectral break. The Alfvén vortices are multi-scale nonlinear structures. We give a review of the main theoretical features of incompressible Alfvén vortsices in the second part of the paper. Finally, we analyze the spectral properties of the Alfvén vortex solution and of the network of such vortices. We show that the observed magnetosheath spectrum in presence of the Alfvén vortices can be described, at least partially, by the vortex network model.

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“…22 data from the high-frequency wave experiment (STAFF, Rezeau et al, 2001 this issue) during the interval of 13:20 to 14:05 UT. The top panel contains electric field wave spectra from 8 Hz to 4 kHz, and the central and bottom panels contain magnetic field wave spectra in the ranges of 8 Hz to 4 kHz and 0-10 Hz, respectively.…”

Section: Ground-based Observations During the Transient Cusp Event Armentioning

confidence: 99%

Coordinated ground-based, low altitude satellite and Cluster observations on global and local scales during a transient post-noon sector excursion of the magnetospheric cusp

et al. 2001

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Abstract. On 14 January 2001, the four Cluster spacecraft passed through the northern magnetospheric mantle in close conjunction to the EISCAT Svalbard Radar (ESR) and approached the post-noon dayside magnetopause over Greenland between 13:00 and 14:00 UT. During that interval, aCorrespondence to: H. J. Opgenoorth (opg@irfu.se) sudden reorganisation of the high-latitude dayside convection pattern accurred after 13:20 UT, most likely caused by a direction change of the Solar wind magnetic field. The result was an eastward and poleward directed flow-channel, as monitored by the SuperDARN radar network and also by arrays of ground-based magnetometers in Canada, Greenland and Scandinavia. After an initial eastward and later 1368 H. J. Opgenoorth et al.: Cluster and ground-based observations of a transient cusp event poleward expansion of the flow-channel between 13:20 and 13:40 UT, the four Cluster spacecraft, and the field line footprints covered by the eastward looking scan cycle of the Söndre Strömfjord incoherent scatter radar were engulfed by cusp-like precipitation with transient magnetic and electric field signatures. In addition, the EISCAT Svalbard Radar detected strong transient effects of the convection reorganisation, a poleward moving precipitation, and a fast ion flowchannel in association with the auroral structures that suddenly formed to the west and north of the radar. From a detailed analysis of the coordinated Cluster and ground-based data, it was found that this extraordinary transient convection pattern, indeed, had moved the cusp precipitation from its former pre-noon position into the late post-noon sector, allowing for the first and quite unexpected encounter of the cusp by the Cluster spacecraft. Our findings illustrate the large amplitude of cusp dynamics even in response to moderate solar wind forcing. The global ground-based data proves to be an invaluable tool to monitor the dynamics and width of the affected magnetospheric regions.

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A case study of low-frequency waves at the magnetopause

Cited by 17 publications

References 17 publications

Power of magnetopause low‐frequency waves: A statistical study

Power of magnetopause low‐frequency waves: A statistical study

Solar wind vs magnetosheath turbulence and Alfvén vortices

Coordinated ground-based, low altitude satellite and Cluster observations on global and local scales during a transient post-noon sector excursion of the magnetospheric cusp

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