... Future seminars . P a s t seminars . ... The Whisper experiment on-board the Cluster mission: multipoint observations on density and wave structures " . ... In a first part, will by present the instrument: functioning, quantity measured, performances, typical observations. In a second part, will be present wave observations in various regions of the magnetosphere, and indicate a few directions of ongoing studies or considered . ... In a third part, will be discussed density structures. ...