Stormtime Pc5 Hydromagnetic Waves in the Middle Magnetosphere: Modulation of Pc1 Ion Cyclotron Waves and the Role of Medium Energy Ions

Details Stormtime Pc5 Hydromagnetic Waves in the Middle Magnetosphere: Modulation of Pc1 Ion Cyclotron Waves and the Role of Medium Energy Ions Stormtime Pc5 Hydromagnetic Waves in the Middle Magnetosphere: Modulation of Pc1 Ion Cyclotron Waves and the Role of Medium Energy Ions

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm51c..03f&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM51C-03

Physics

2752 Mhd Waves And Instabilities, 2778 Ring Current, 2788 Storms And Substorms

Scientific paper

The influence of compressional Pc5 ULF waves on the Pc1-2 electromagnetic ion cyclotron wave generation process involving medium energy ions in the middle magnetosphere is studied using CRRES observations. The two types of waves are seen simultaneously in association with magnetic storms. In the waves studied here, EMIC waves have a short duration in comparison with the Pc5 wave cycle and appear to be modulated by the Pc5 waves. There is also a tendency for the EMIC waves to increase in amplitude during the decrease in Pc5 wave magnetic field, with maximum EMIC wave power shifting to lower frequencies. From consideration of instability theory it is shown that the modulation of the EMIC waves by the Pc5 waves may not be controlled only through the variation of energetic ion temperature anisotropy in an adiabatic process which shows in-phase modulation, but also through the variation in the magnetic field on the ion cyclotron instability, and the variation of the number and energy density of the energetic ions in a non-adiabatic interaction with the Pc5 waves. These latter modulations will be discussed with respect to the CRRES magnetic field, wave and particle data analysed.

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