Plasma and Field Observations at the Day-side, Equatorial Magnetopause, Boundary Layers, and Magnetosphere

Details Plasma and Field Observations at the Day-side, Equatorial Magnetopause, Boundary Layers, and Magnetosphere Plasma and Field Observations at the Day-side, Equatorial Magnetopause, Boundary Layers, and Magnetosphere

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm42d02c&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM42D-02

Physics

2724 Magnetopause, Cusp, And Boundary Layers, 2728 Magnetosheath, 2731 Magnetosphere--Outer, 2772 Plasma Waves And Instabilities

Scientific paper

The Polar spacecraft's orbit has precessed in latitude to an orientation that places it at the dayside equatorial magnetopause every 18 hours. In this configuration the various regions near the magnetopause (low-latitude boundary layer, turbulent boundary layer, magnetosphere, and magnetosheath) are sampled with high-temporal and spatial resolution. These observational periods - ranging from several minutes to more than two hours - provide an unprecedented look at the plasma conditions in these regions. Initial analysis of the low-energy ion data from TIDE reveals plasmaspheric-like ions within the turbulent boundary layer within which circularly polarized waves accelerate the ions to 30-40 km s-1 perpendicular to the local magnetic field. These relatively high velocities allow the H+ to be observed over the 2V spacecraft potential and put the low-density O+ in the higher-energy, higher-sensitivity channels such that densities of order 10-2 can be observed. These circumstances allow for of the direct observation of ions of plasmaspheric origin as they interact with the magnetopause and, thus, an accurate accounting of this mechanism as a source of plasma on high-latitude, open field lines.

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