Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm23b1694i&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM23B-1694
Physics
2712 Electric Fields (2411), 2721 Field-Aligned Currents And Current Systems (2409), 2736 Magnetosphere/Ionosphere Interactions (2431), 2760 Plasma Convection (2463), 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
DP2 caused by IMF southward/northward variations has important information about how the solar wind effects are transferred into the magnetosphere, and ionosphere, and on the ground. Since dayside ground magnetic field variations are significantly enhanced during DP2, dayside DP2 fluctuations have been investigated for ages. But night-side DP2 variations are not investigated enough yet. As a new approach to DP2, in this study we examined night-side magnetic variations when DP2 occurred in dayside. Ground data from MAGnetic Data Acqisition System and Circum-pan Pacific Magnetometer Network (MAGDAS/CPMN) stations were analyzed. To identify dayside DP2 events, we used the records of stations located at the dip equator. The association of DP2 with the solar wind variations, magnetic and velocity data from the ACE satellite were investigated. The obtained results by statistical analysis can be summarized as follows. (1) About half (82/153) of the dayside DP2 events are found to accompany the night-side DP2 with similar wave form. (2) The amplitude of the night-side variation (which correlates with the dayside DP2) shows a good correlation with the intensity of the dawn-to-dusk electric field in the solar wind. In the present paper, we will discuss a generation mechanism of the night-side DP2 for a case study. Acknowledgments. We would like to thank the organization for cooperating MAGDAS/CPMN project; Commodore Rodolfo M. Agaton (Director, CGSD, Coast and Geodetic Survey Department, Mutinlupa), Dr. Mazlan Othman (Director General of National Space Agency, Langkawi), Fr. Daniel McNamara (Director, Manila Observatory, Davao), Dr. David Aranug (Director, Weather Service Office YAP, Yap), Dr. Ronald Woodman Pollitt (Presidente Ejecutivo Instituto Geofisico del Peru, Ancon), Dr. Baylie Damtie (IHY National Coordinator in Ethiopia, Dept. of Physics, Bahir Dar University, Addis Ababa).
Imamura Kayuyoshi
Shinohara Manabu
Yumoto Kiyo
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