Skip to Main content Skip to Navigation
Theses

Les échelles de la turbulence dans l'ionosphère des hautes latitudes et leurs signatures sur les échos des radars HF du réseau SuperDARN

Abstract : SuperDARN is a coherent HF radar network dedicated to the study of high-latitude ionospheric plasma convection and finds its major applications in the field of Sun/Earth connection. This work deals with the interactions between a transmitted radar wave and ionisation gradients at different scales and their impact on measurements. Studies are performed in order to detect the ion cyclotron signature, superimposed to turbulent motions, in observed spectra. On the other hand, the role of intermediate scales (from hundreds of meters to kilometers) on spectral width estimation is evidenced. Statistical studies show that the value of this parameter depends upon transmitted frequency and echo range. We propose an interpretation in terms of a wave front decorrelation during propagation and validate it with numerical simulations based upon realistic ionospheric parameters.
Complete list of metadatas

Cited literature [161 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-00689878
Contributor : Nathalie Pothier <>
Submitted on : Friday, April 20, 2012 - 2:38:13 PM
Last modification on : Thursday, June 18, 2020 - 9:24:04 AM
Long-term archiving on: : Wednesday, December 14, 2016 - 11:45:23 PM

Identifiers

  • HAL Id : tel-00689878, version 1

Collections

Citation

Xavier Vallières. Les échelles de la turbulence dans l'ionosphère des hautes latitudes et leurs signatures sur les échos des radars HF du réseau SuperDARN. Planétologie et astrophysique de la terre [astro-ph.EP]. Université d'Orléans, 2002. Français. ⟨tel-00689878⟩

Share

Metrics

Record views

341

Files downloads

1478