Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm32c..04c&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SM32C-04
Physics
2716 Energetic Particles, Precipitating, 2720 Energetic Particles, Trapped, 2724 Magnetopause, Cusp, And Boundary Layers, 2728 Magnetosheath, 2740 Magnetospheric Configuration And Dynamics
Scientific paper
Extremely large diamagnetic cavities with a size of as large as 6 Re have been observed in the dayside high-altitude cusp regions. Some of the diamagnetic cavities were independent of the IMF directions, which is unexpected by the current MHD (or ISM) models, suggesting that the cusp diamagnetic cavities are different from the magnetospheric sash, which provides a challenge to the existing MHD (or ISM) models. Associated with these cavities are ions with energies from 40 keV up to 8 MeV. The charge state distribution of these cusp cavity ions was indicative of their seed populations being a mixture of the ionospheric and the solar wind particles. The intensities of the cusp cavity energetic ions were observed to increase by as large as four orders of the magnitudes. During high solar wind pressure period on April 21, 1999, the POLAR spacecraft observed lower ion flux in the dayside high-latitude magnetosheath than that in the neighbouring cusp cavities. These observations indicate that the dayside high-altitude cusp diamagnetic cavity is a key region for transferring the solar wind energy, mass, and momentum into the Earth's magnetosphere. These energetic particles in the cusp diamagnetic cavity together with the cusp's connectivity have significant global impacts on the geospace environment research and will be shedding light on the long-standing unsolved fundamental issue about the origins of the energetic particles in the ring current and in upstream ion events.
Chen Jiahua
Fritz Teresa A.
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