Study of Magnetospheric Convection near a Drainage Plume Using Simultaneous Observations from IMAGE and Three DMSP satellites

Details Study of Magnetospheric Convection near a Drainage Plume Using Simultaneous Observations from IMAGE and Three DMSP satellites Study of Magnetospheric Convection near a Drainage Plume Using Simultaneous Observations from IMAGE and Three DMSP satellites

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsm31b..06l&link_type=abstract

American Geophysical Union, Spring Meeting 2007, abstract #SM31B-06

Other

2730 Magnetosphere: Inner, 2736 Magnetosphere/Ionosphere Interactions (2431), 2760 Plasma Convection (2463), 2768 Plasmasphere

Scientific paper

We report on equatorial convection associated with a plasmaspheric drainage plume using simultaneous observations from IMAGE and three DMSP satellites. During the early recovery phase of the July 2000 Bastille Day magnetic storm the Extreme Ultraviolet (EUV) sensor on the IMAGE satellite detected the plume near 16:00 - 17:00 MLT extending outward to L = 2.8. The plasmaspheric boundary was near L = 2 at other local times. We mapped simultaneously-measured ionospheric plasma drifts from three DMSP spacecraft along magnetic field lines to infer equatorial convection velocities in the inner magnetosphere. The meridional profile of horizontal velocities deduced from DMSP measurements shows a large, westward-flowing sub-auroral polarization stream (SAPS) located outside the plasmapause. The peak velocity of the SAPS centered at a radial distance of L = 2.8 with a full-width of about 1 RE. In the inertial frame of reference, equatorial plasmas flowed toward the plume from both its day and evening sides, suggesting a negative gradient in the equatorial azimuthal velocity that was largest near plume's outermost boundary. These observations provide new evidence about diversion of SAPS plasma flows and distinctive azimuthal velocity patterns in the vicinity of plasmaspheric plumes.

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