Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm51b1640w&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM51B-1640
Physics
2447 Modeling And Forecasting, 2706 Cusp, 2723 Magnetic Reconnection (7526, 7835), 2776 Polar Cap Phenomena, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
When IMF y-component is dominant, a meridionally traveling satellite near noon frequently encounters two cusps that are separated latitudinally (double cusp). Examples of double cusp observations can be found in the satellite particle observations. The lower latitude cusp ion has little energy-latitude dispersion (stagnant) whereas the higher latitude cusp ion exhibits some dispersion. A particle precipitation model calculation of double cusp is presented. The dispersion signature can be explained from the ExB and the spacecraft trajectory. In the model, the lower latitude cusp ion originates from low-latitude magnetopause whereas the higher latitude cusp ion from high-latitude. The result suggests that reconnections simultaneously occur at low- and high-latitude magnetopause. The high-latitude reconnection would have a high magnetic shear but the low-latitude reconnection would have a modest magnetic shear. Examples of double cusps in the UVI images are also presented.
Wing Simon
Zhang Yajing
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