Unusual Density Structures in the Outer Plasmasphere Near the Magnetic Equator

Details Unusual Density Structures in the Outer Plasmasphere Near the Magnetic Equator Unusual Density Structures in the Outer Plasmasphere Near the Magnetic Equator

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm34a..08g&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM34A-08

Physics

2730 Magnetosphere: Inner, 2736 Magnetosphere/Ionosphere Interactions (2431), 2768 Plasmasphere

Scientific paper

The magnetic equator has long been known as a region of interaction between plasma populations, particularly through plasma waves. Here microphysical processes may participate in the isotropization of field-aligned outflowing ionospheric plasma that repopulates magnetic field lines evacuated by the storm-time enhanced convection electric field. Olsen et al. [1987] reported direct evidence for trapped H+ ions at the magnetic equator in the presence of ion cyclotron and/or lower hybrid waves. They further reported no corresponding variation in total density, except for an occasional dip in density at the magnetic equator. IMAGE radio plasma imager (RPI) and extreme ultraviolet imager (EUV) measurements, of H+ and He+ respectively, appear to suggest the presence of enhanced equatorial plasma density in the outer plasmasphere during storm recovery times. Some field refilling models postulate the transient existence of field-aligned density structures, which have not so far been observed. We will present the results of RPI and EUV analysis of these observed outer plasmaspheric features and discuss the implications in light of past observations and theory.

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