Simultaneous observations of the plasma density on the same field line by the CPMN ground magnetometers and the Cluster satellites |
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| Authors: | Naoya Maeda Satoko Takasaki Hideaki Kawano Shinichi Ohtani PME Décréau JG Trotignon SI Solovyev DG Baishev Kiyohumi Yumoto |
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| Institution: | 1. Department of Earth and Planetary Sciences, Kyushu University, Fukuoka, Japan;2. National Institute of Polar Research, Tokyo, Japan;3. Transdisciplinary Research Integration Center, Research Organization of Information and Systems, Tokyo, Japan;4. Space Environment Research Center, Kyushu University, Fukuoka, Japan;5. Johns Hopkins University, Applied Physics Laboratory, Laurel, Maryland, USA;6. Laboratoire de Physique et Chimie de l’Environnement, Centre National de la Recherche Scientifique, Orléans, France;g Yu.G.Shafer Institute of Cosmophysical Research and Aeronomy, Siberian Branch, Russian Academy of Sciences, 31 Lenin Avenue, Yakutsk 678980, Russia |
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| Abstract: | By applying the cross-phase method and the amplitude-ratio method to magnetic field data obtained from two ground stations located close to each other, we can determine the frequency of the field line resonance (FLR), or the field line eigenfrequency, for the field line running through the midpoint of the two stations. From thus identified FLR frequency we can estimate the equatorial plasma mass density (ρ) by using the T05s magnetospheric field model Tsyganenko, N.A., Sitnov, M.I. Modeling the dynamics of the inner magnetosphere during strong geomagnetic storms, J. Geophys. Res. 110, A03208, 2005] and the equation of Singer et al. Singer, H.J., Southwood, D.J., Walker, R.J., Kivelson, M.G. Alfven wave resonances in a realistic magnetospheric magnetic field geometry, J. Geophys. Res. 86 (A6) 4589–4596, 1981]. |
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| Keywords: | Field line resonance Ground magnetometer Cluster spacecraft Plasma mass density Electron number density WHISPER instrument CPMN Circum-pan Pacific Magnetometer Network Magnetic storm Ion composition Magnetosphere Cross-phase method Amplitude-ratio method Plasmasphere Trough region Plasmapause |
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