Features and Distribution of Intense, Small Scaled Field Aligned Currents in Polar Regions

Details Features and Distribution of Intense, Small Scaled Field Aligned Currents in Polar Regions Features and Distribution of Intense, Small Scaled Field Aligned Currents in Polar Regions

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsa31b..01r&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA31B-01

Physics

1541 Satellite Magnetics: Main Field, Crustal Field, External Field, 2455 Particle Precipitation, 2467 Plasma Temperature And Density

Scientific paper

Field-aligned currents (FACs) can be observed over a wide range of scales. Generally, the current density is getting higher the smaller the scales are. The low-Earth orbiting satellite CHAMP allows accessing FAC down to scales of a couple of 100m based on its magnetic field vector data sampled at 50 Hz. There are occasional bursts of small-scale FACs having amplitudes about two decades above the large-scaled ones (100-300km). These events are clustering in the dayside auroral region. Using CHAMP magnetic field vector data of four years (2001 - 2005) detailed studies of these currents can be performed. High-resolution plots show that there seems to be smallest scale size of about 1km. Upward and downward FACs are balanced very well locally. The large number of events allows to study the statistical properties. Bursts of FAC are isolated to individual events and the occurrence rate in Magnetic local time and latitude is investigated. Small scaled FAC seems to be associated with electron temperature enhancements in the vicinity of the polar cusp region. The relation between small-scale FACs, electron temperature and plasma density is studied in a superposed epoch analysis.

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