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Article Dans Une Revue Geophysical Research Letters Année : 2012

Source location of falling tone chorus

S. Kurita
  • Fonction : Auteur
H. Misawa
  • Fonction : Auteur
C. M. Cully
  • Fonction : Auteur
Olivier Le Contel
V. Angelopoulos
  • Fonction : Auteur

Résumé

Chorus is characterized by its fine structures consisting of rising or falling tones believed to result from nonlinear wave-particle interactions. However, previous studies have showed that the intensity and propagation characteristics of rising and falling tone chorus are quite different, suggesting that their generation processes might be different. In this paper, the propagation direction of falling tone chorus is statistically investigated to identify its source region based on the Poynting vector measurement with THEMIS. The result shows that the falling tone chorus propagates from the magnetic equator to higher latitude both in the northern and southern hemispheres, in the same way as rising tone chorus. Our result shows that the magnetic equator is the common source location for both rising and falling tone chorus. The result emphasizes that the different properties between rising and falling tone chorus originate from their generation mechanism rather than source region.

Dates et versions

hal-01553718 , version 1 (03-07-2017)

Identifiants

Citer

S. Kurita, H. Misawa, C. M. Cully, Olivier Le Contel, V. Angelopoulos. Source location of falling tone chorus. Geophysical Research Letters, 2012, 39, pp.22102. ⟨10.1029/2012GL053929⟩. ⟨hal-01553718⟩
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