English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Chorus emissions are often observed by the STAFF spectrumanalyser on board the 4 satellites of CLUSTER. This instrument providesthe cross spectral matrix of three magnetic and two electric fieldcomponents. Dedicated software processes this spectral matrix in order todetermine the propagation characteristic of these chorus waves. Measurementsof the parallel component of the Poynting vector around the magnetic equatorindicate that the chorus waves propagate away from this region which isconsidered as the source area of these emissions. This is valid for the mostintense waves observed on the magnetic and electric power spectrograms. Butit has also been observed that lower intensity waves propagate toward theequator at the same frequency. Using the wave normal directions of thesewaves, a ray tracing study has shown that the waves have suffered a LowerHybrid Resonance (LHR) reflection at low altitudes and now return to theequator at a different location with a lower intensity. The paper presentsother similar events when WBD data are simultaneously recorded. The WBDexperiment provides a much better time resolution and allows one to check thestructure of the returning waves. It is observed that these waves have stilla high degree of polarization, even if they started to lose the coherentstructure of the chorus elements. They reach the equator with a small wavenormal angle which is more efficient for a further amplification. It isexplained that these emissions could be a source of hiss

Characteristics of magnetospherically reflected chorus waves observed by CLUSTER