SM41H-2578
Cluster Observations of Non Time Continuous Magnetosonic Waves
Thursday, 17 December 2015
Poster Hall (Moscone South)
Simon N Walker, University of Sheffield, Sheffield, United Kingdom, Michael A Balikhin, University of Sheffield, Sheffield, S10, United Kingdom, Scott A Boardsen, NASA Goddard Space Flight Center, Heliophysics Science Division, Greenbelt, MD, United States and David G Sibeck, NASA/GSFC, Greenbelt, MD, United States
Abstract:
Observations of magnetosonic waves in the inner magnetosphere have always shown that the waves are time continuous when viewed in a time-frequency spectrogram. Recently, examples of magnetosonic waves with modulated, rising tone elements have been reported. New observations from Cluster also show the existence of other, intermittent occurrences of magnetosonic waves. In this paper we investigate the properties of these wave emissions to determine the causes of these non-time continuous emissions. We report on a statistical study of the rate of frequency change for the rising tone emission features and show that they are modulated by fluctuations in the magnetic field. The more intermittent emissions appear to be controlled by the plasma density.
