Cluster Magnetic Field Observations of Temporal and Spatial Variations of the Quasi-Perpendicular Bowshock

Details Cluster Magnetic Field Observations of Temporal and Spatial Variations of the Quasi-Perpendicular Bowshock Cluster Magnetic Field Observations of Temporal and Spatial Variations of the Quasi-Perpendicular Bowshock

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm11d..07h&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM11D-07

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2149 Mhd Waves And Turbulence, 2154 Planetary Bow Shocks, 2159 Plasma Waves And Turbulence, 2752 Mhd Waves And Instabilities

Scientific paper

Cluster four spacecraft magnetic field observations of the quasi-perpendicular terrestrial bowshock reveal variations in both space and time. On the typical formation scale of around 600 km, the large scale field magnitude profile through shocks was largely similar at all four spacecraft. In contrast, whistler and ion cyclotron wave activity up and downstream was generally uncorrelated, although statistically similar at different spacecraft. We present data from a number of shock crossings in the first year of operations, and show examples of the up and downstream wave activity. Some events suggest that downstream shock and wave structure is correlated on the separation scale, and that differences between spacecraft are due to them sampling the shock at slightly different times. We also discuss other phenomena, such as: amplitude modulation of downstream waves observed at all four spacecraft; changes in downstream waves as a result of shock acceleration; and rapid changes in shock character as a result of changes in solar wind conditions.

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