Mass Density at L=2.5 During a Magnetic Storm: a Case Study

Physics

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2471 Plasma Waves And Instabilities, 2730 Magnetosphere: Inner, 2752 Mhd Waves And Instabilities, 2768 Plasmasphere

Scientific paper

The inner magnetosphere plasma environment is rather dynamic and of great interest. Observational data usually come from spacecraft (e.g. particle counters, imagers) and ground-based (VLF whistlers) techniques. However, VLF receivers can also be used to monitor artificially produced whistler-mode waves that propagate in field-aligned ducts and that provide information on the electron density in the equatorial plane. Furthermore, ground magnetometers can be used to detect ULF field line resonances (FLRs) whose frequency relates to the plasma mass density in the equatorial plane. We describe an experiment using co-located magnetometers and VLF receivers to monitor mass and electron density for the same L=2.5 flux tube. We focus in particular on the variation in electron and mass density during a magnetic storm cycle. The experiments provide information on the storm-time variation in heavy ion mass loading that is compared with in situ measurements and EUV images of the He+ concentration.

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