Erosion and Recovery of the Plasmasphere in the Plasmapause Region

Carpenter, D. L.; Lemaire, J.

doi:10.1007/978-94-009-0045-5_7

Cited by 64 publications

(89 citation statements)

References 72 publications

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“…As a result of this followup radial expansion, the plasma density inside the plasmasphere is expected to be reduced, as indeed observed since many years through the whistler technique (Carpenter and Lemaire, 1997). The blue stars represent the theoretical plasmapause position predicted by the instability model in case K p would have been independent of time.…”

Section: Radial Distance Of the Plasmapausementioning

confidence: 59%

Comparisons between EUV/IMAGE observations and numerical simulations of the plasmapause formation

Pierrard

Cabrera

2005

Ann. Geophys.

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Section: Radial Distance Of the Plasmapausementioning

confidence: 59%

Comparisons between EUV/IMAGE observations and numerical simulations of the plasmapause formation

Pierrard

Cabrera

2005

Ann. Geophys.

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“…10a shows the angles α B,∇|B| and α B,∇n e between the ambient magnetic field B on the one hand and ∇|B| and ∇n e on the other hand, in blue and red, respectively (anisotropic case with fluctuations). The Cluster spacecraft are sampling the outer regions of the plasmasphere, which happen to be the most dynamic ones where erosion can be important (e.g., Carpenter and Lemaire, 1997;Lemaire and Gringauz, 1998;Carpenter and Lemaire, 2004;Décréau et al, 2005). Cluster has therefore been used intensively to study these regions (e.g., Darrouzet et al, 2004, .…”

Section: Physical Relevancementioning

confidence: 99%

Least-squares gradient calculation from multi-point observations of scalar and vector fields: methodology and applications with Cluster in the plasmasphere

et al. 2007

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Abstract. This paper describes a general-purpose algorithm for computing the gradients in space and time of a scalar field, a vector field, or a divergence-free vector field, from in situ measurements by one or more spacecraft. The algorithm provides total error estimates on the computed gradient, including the effects of measurement errors, the errors due to a lack of spatio-temporal homogeneity, and errors due to small-scale fluctuations. It also has the ability to diagnose the conditioning of the problem. Optimal use is made of the data, in terms of exploiting the maximum amount of information relative to the uncertainty on the data, by solving the problem in a weighted least-squares sense. The method is illustrated using Cluster magnetic field and electron density data to compute various gradients during a traversal of the inner magnetosphere. In particular, Cluster is shown to cross azimuthal density structure, and the existence of field-aligned currents in the plasmasphere is demonstrated.

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“…On the other hand, penetration electric fields during storm onset and drifts due to the disturbance dynamo (Blanc and Richmond, 1980) also contribute to the well-known plasmapause displacement during the storm (Carpenter and Lemaire, 1997), as well as to the decrease of plasma density in the outer region within the re-filling plasmasphere. The disturbance dynamo effect is known to persist for many hours due to the neutral air inertia.…”

Section: Ionospheric Sounding Measurementsmentioning

confidence: 99%

ULF fluctuations of the geomagnetic field and ionospheric sounding measurements at low latitudes during the first CAWSES campaign

Villante¹,

Vellante²,

Francia³

et al. 2006

Ann. Geophys.

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Abstract.We present an analysis of ULF geomagnetic field fluctuations at low latitudes during the first CAWSES campaign (29 March-3 April 2004). During the whole campaign, mainly in the prenoon sector, a moderate Pc3-4 pulsation activity is observed, clearly related to interplanetary upstream waves. On 3 April, in correspondence to the Earth's arrival of a coronal mass ejection, two SIs are observed whose waveforms are indicative of a contribution of the high-latitude ionospheric currents to the low-latitude ground field. During the following geomagnetic storm, low frequency (Pc5) waves are observed at discrete frequencies. Their correspondence with the same frequencies detected in the radial components of the interplanetary magnetic field and solar wind speed suggests that Alfvénic solar wind fluctuations may act as direct drivers of magnetospheric fluctuations. A cross-phase analysis, using different pairs of stations, is also presented for identifying field line resonant frequencies and monitoring changes in plasmaspheric mass density. Lastly, an analysis of ionospheric vertical soundings, measured at the Rome ionosonde station (41.8 • N, 12.5 • E), and vertical TEC measurements deduced from GPS signals within an European network shows the relation between the ULF resonances in the inner magnetosphere and thermal plasma density variations during geomagnetically quiet conditions, in contrast to various storm phases at the end of the CAWSES campaign.

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Erosion and Recovery of the Plasmasphere in the Plasmapause Region

Cited by 64 publications

References 72 publications

Comparisons between EUV/IMAGE observations and numerical simulations of the plasmapause formation

Comparisons between EUV/IMAGE observations and numerical simulations of the plasmapause formation

Least-squares gradient calculation from multi-point observations of scalar and vector fields: methodology and applications with Cluster in the plasmasphere

ULF fluctuations of the geomagnetic field and ionospheric sounding measurements at low latitudes during the first CAWSES campaign

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