Geomagnetic Activity Dependence of Occurrence Probability and Spatial Distribution of Upstream Events

Keika K., Nose M., Christon S.P., McEntire R.W.
Department of Geophysics, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakechou, Sakyou-ku, Kyoto, 606-8502, Japan; Data Analysis Center for Geomagnetism and Space Magnetism, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakechou, Sakyou-ku, Kyoto, 606-8502, Japan; Focused Analysis and Research, Columbia, MD 21044, United States; The Johns Hopkins University Applied Physics Laboratory, 111000 Johns Hopkins Road, Laurel, MD 20723-6099, United States

Abstract: We investigated upstream events observed by the ion composition system (ICS) sensor of the energetic particles and ion composition (EPIC) instrument on board the Geotail spacecraft. We examined how occurrence probability and spatial distribution of upstream events depend on the geomagnetic activity. The results showed that the upstream events were observed more frequently in the dawn side during intense geomagnetic activity in particular. We also analyzed carbon-nitrogen-oxygen ions during the upstream events. From the above results we discuss origin of the upstream energetic ions. © 2005 Elsevier B.V. All rights reserved.

Year: 2005
Source title: COSPAR Colloquia Series
Volume: 16
Issue: C
Page : 297-300
Link: Scorpus Link
Document Type: Article
Source: Scopus
Authors with affiliations:

1. Keika, K., Department of Geophysics, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakechou, Sakyou-ku, Kyoto, 606-8502, Japan
2. Nose, M., Data Analysis Center for Geomagnetism and Space Magnetism, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakechou, Sakyou-ku, Kyoto, 606-8502, Japan
3. Christon, S.P., Focused Analysis and Research, Columbia, MD 21044, United States
4. McEntire, R.W., The Johns Hopkins University Applied Physics Laboratory, 111000 Johns Hopkins Road, Laurel, MD 20723-6099, United States

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