Cluster Observations of the Dynamic High-Altitude Cusp

Details Cluster Observations of the Dynamic High-Altitude Cusp Cluster Observations of the Dynamic High-Altitude Cusp

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm22a0802t&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM22A-0802

Physics

2724 Magnetopause, Cusp, And Boundary Layers, 2731 Magnetosphere: Outer, 2794 Instruments And Techniques

Scientific paper

The Cluster mission's principal aim is to resolve the spatial-temporal ambiguity associated with single point measurement by probing small scale 3-D spatial structure. Of particular interest are the mid-high altitude (~6-10 RE) magnetospheric cusps, where Cluster's four point measuring capability is addressing some of the long standing issues raised by previous spacecraft missions in this region (e.g. HEOS, HAWKEYE and INTERBALL). On 26th February 2001, the spacecraft were outbound over the northern hemisphere, at approximately 12 MLT, approaching the magnetopause through the high-altitude (and exterior) cusp region. Due to macroscopic motion of the cusp, the spacecraft made multiple entries into the exterior cusp region before exiting into the magnetosheath. Utilising both electron and magnetic field measurements from the PEACE and FGM instruments on board the Cluster spacecraft, we examine the dynamic behaviour and internal structure of the cusp and associated boundary layers. Using position information, defining the relative spacecraft locations, together with the timing of key features in both instrument data sets, to co-ordinate the four spacecraft data, we estimate the morphology of the cusp and its response to a disturbed magnetosheath field.

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