CEP 3D Pitch Angle Distributions Observed by ISEE-1

Details CEP 3D Pitch Angle Distributions Observed by ISEE-1 CEP 3D Pitch Angle Distributions Observed by ISEE-1

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm31a..01w&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM31A-01

Physics

2706 Cusp, 2716 Energetic Particles: Precipitating, 2724 Magnetopause And Boundary Layers, 2740 Magnetospheric Configuration And Dynamics

Scientific paper

Observations on October 30, 1978 show the ISEE-1 spacecraft passing though the high-altitude dayside northern cusp region from roughly 16:00 to 18:30 UT, during a slow solar wind period (~380 km/s). More than two orders of magnitude enhancements of the cusp energetic particle (CEP) fluxes are observed along with a depressed and turbulent local magnetic field. The clock angle of the local magnetic field is different from that of the IMF, implying that the spacecraft was indeed inside the magnetosphere. The CEP 3-dimensional pitch angle distributions reveal an energetic particle population in this cusp region peaked at a 90 degree pitch angle as the satellite crossed initially into the cusp. At a later time, these particles stream from below and their direction is controlled by the local magnetic field, with an energy of about 24-140 keV. No obvious time- energy dispersion is measured for the CEP fluxes. The time evolution of the phase space density from the temporary entrapment to the neighboring regions exhibits a positive gradient pointed to the high-altitude cusp, indicating a probable cusp source of these energetic particles. The observed variations of the pitch angle distributions provide the unique opportunity to determine the geometry and structure of the boundary of the cusp. The subsequent evolution of the pitch angle distributions of the energetic ions and electrons offers new information to study the properties of the acceleration mechanism(s) of these CEP particles. Through a careful analysis of the data available, we report the first instance of the equatorial orbiting ISEE-1 spacecraft passing through the cusp region.

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