The global geosynchronous plasma environment seen through neutral atom imaging and local multipoint measurements

Details The global geosynchronous plasma environment seen through neutral atom imaging and local multipoint measurements The global geosynchronous plasma environment seen through neutral atom imaging and local multipoint measurements

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm52a..02r&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SM52A-02

Other

2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 2760 Plasma Convection, 2764 Plasma Sheet, 2768 Plasmasphere

Scientific paper

Geosynchronous orbit provides a rich opportunity for observing a variety of plasma environments including the plasmasphere and the plasmasheet as well as drainage plumes and troughs. Those environments can be well-characterized with local, in situ measurements. Now a global view of the near-Earth plasma environment is available from the IMAGE Medium Energy Neutral Atom (MENA) instrument. We present the first systematic comparison of these two rich and complementary data sources. The comparison not only gives a global context for in situ observations of the plasmasphere and plasmasheet but also allows direct confirmation of the ion fluxes inferred from ENA image inversion with direct local measurements of those fluxes. Of course, ENA fluxes come from an integral along the entire line of sight, not just a single near equatorial point, which turns out to be an advantage rather than a limitation. By comparing model and observed values at the spacecraft location and at other points along the line of sight we can obtain an estimate of the global configuration of both the particle environment and the geomagnetic field. This study is considerably enhanced by the recent availability of plasma data from up to six simultaneously-operating LANL geosynchronous satellites which provide unprecedented local time coverage in the equatorial plane and by the POLAR and Cluster observations which make passes perpendicular to the equatorial plane.

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