Multiple Cusps Observed by Cluster and DMSP Spacecraft

Details Multiple Cusps Observed by Cluster and DMSP Spacecraft Multiple Cusps Observed by Cluster and DMSP Spacecraft

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsm23a..01z&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SM23A-01

Physics

2700 Magnetospheric Physics, 2720 Energetic Particles, Trapped, 2724 Magnetopause, Cusp, And Boundary Layers, 2728 Magnetosheath, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

On March 21- 22, 2001, four cusp-like regions were observed consecutively in about five and half hours by all four Cluster Spacecraft when interplanetary magnetic field (IMF) is northward with a significant By component. The multiple cusps were surrounded by the dayside magnetosphere rather than the magnetopause. Observational evidence showed that the observed multiple cusps were probably a temporal sequence. The boundary normal, velocity and timing analysis for six clear boundaries of the cusps obtained by all four spacecraft indicate that the observed cusps oscillated back and forth. The Cluster spacecraft were oscillating between the dayside magnetosphere and the cusp region. The normal velocities vn at boundary interfaces (exit from the cusp) are found to be almost three times as larger as that at boundary interfaces (entry into the cusp). There exists clear interfaces between the cusp and the dayside magnetosphere during northward IMF instead of a turbulent entry layer as proposed by Hhaerende. The observations made in this paper suggest the shape and location of the cusp may rarely be static but is often changing as a result of dynamic processes in the high latitude regions.

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