Storm-time plasmaspheric depletion and refilling as observed by joint mass and charge density measurements

Details Storm-time plasmaspheric depletion and refilling as observed by joint mass and charge density measurements Storm-time plasmaspheric depletion and refilling as observed by joint mass and charge density measurements

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm13b..04c&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM13B-04

Physics

2736 Magnetosphere/Ionosphere Interactions (2431), 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2768 Plasmasphere, 2788 Magnetic Storms And Substorms (7954), 6939 Magnetospheric Physics (2700)

Scientific paper

The plasma distribution in the coupled plasmaspheric-ionospheric system can undergo significant changes during magnetic storms, posing a challenging problem to observers and modelers for quantifying all the important physical mechanisms involved. In this study we compare the mass and charge density observations inferred from ground-based field line resonance (FLR) and ducted whistler measurements during the November 2004 storm when the Dst index displayed a two-dip structure: one minimum at -373 nT on November 8 and the second minimum at -289 nT on November 10. Ground FLR measurements at L = 3.3 indicate that the equatorial mass density decreased by 30% within two hours at the beginning of the storm on November 7, slightly recovered on November 9, and dropped again on November 10 after the second storm intensification. Whistler data recorded by the Palmer VLF station in Antarctica show that, two hours prior to the Dst minimum on November 8, the equatorial electron density at L ~ 3 dropped by more than 40% compared to the pre-storm level. We will discuss the contribution of heavy ions at different storm phases estimated from the joint observations of mass and charge densities and the implications on storm dynamics.

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