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Communication Dans Un Congrès Année : 2010

Cluster multi-point observations of density cavities in and near the Auroral Acceleration Region

A. Masson
  • Fonction : Auteur
J. S. Pickett
  • Fonction : Auteur
G. T. Marklund
  • Fonction : Auteur
I. Christopher
  • Fonction : Auteur
A. N. Fazakerley
  • Fonction : Auteur
C. P. Escoubet
  • Fonction : Auteur
M. G. Taylor
  • Fonction : Auteur
H. E. Laakso
  • Fonction : Auteur

Résumé

2010 marks the 10th anniversary of the ESA/NASA Cluster mission in space. During this decade, the Cluster mission has crossed a number of key regions of the Earth’s magnetosphere, enabling to study the Sun-Earth connection for the first time with four point measurements. Since 2006, the orbits of the Cluster satellites are slowly evolving from a nominal polar orbit to an oblique one. Meanwhile, the perigees of their orbits are going down from 19,000 km to just a few hundred kilometres. During spring 2009 and early winter 2009/2010, Cluster scientists could make use of this natural orbital drift to target a new key region of the magnetosphere, never crossed before by multiple spacecraft: the Auroral Acceleration Region (AAR). We present new observations of density cavities captured simultaneously by multiple satellites in the AAR region. The estimation of the electron density itself will be first presented. This estimation is indeed based not only on one but multiple instruments available on each Cluster satellite including: an electric field instrument, a relaxation sounder, a passive wave receiver and particle experiments. The quantitative estimation of these cavities is of crucial importance for different physical auroral processes. For instance, auroral kilometric radiation sources are included inside plasma cavities. Estimation of the gradient scale of the edges of plasma cavities will also be presented.
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Dates et versions

hal-03548970 , version 1 (31-01-2022)

Identifiants

Citer

A. Masson, J. S. Pickett, G. T. Marklund, I. Christopher, J. Trotignon, et al.. Cluster multi-point observations of density cavities in and near the Auroral Acceleration Region. American Geophysical Union, 2010, à renseigner, Unknown Region. pp. 1542-1550. ⟨hal-03548970⟩
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