Physics
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989rspta.328...43b&link_type=abstract
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, Volume 328, Issue 1598,
Physics
18
Scientific paper
A survey is made, by using measurements from the Active Magnetospheric Particle Tracer Explorers - United Kingdom Satellite, of the interaction between plasmas of solar and terrestrial origin at the outer edge of the Earth's magnetosphere. The position of the boundary and its rate of movement are related statistically to solarwind dynamic pressure and its variations. The first results are presented of a new type of analysis which aims to clarify the nature of the boundary layer that develops between the two plasmas by reordering, on the basis of a consistent relation between electron density and temperature, the normally erratic progress made by a spacecraft across the constantly moving region. Distinctive patterns found consistently for the electron and ion transitions suggest that diffusion, viscosity and loss to the atmosphere govern the boundary layer. Various possibilities are discussed for the topology of the region. Electron acceleration within the boundary layer is identified; its cause and relevance to dayside auroral precipitation are discussed. There is an indication that the transition in the magnetic field, across the magnetopause current layer, lies within, rather than immediately outside, the boundary layer.
Bryant Duncan A.
Riggs S.
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