HR: 0800h
AN: SH31A-1163    [Abstracts]
TI: Solar cycle variation of long-duration radial IMF at 1 AU
AU: * Watari, S
EM: watari@nict.go.jp
AF: National Institute of Information and Communications Technology, 4-2-1 Nukuikita, Koganei, Tokyo, 184-8795 Japan
AU: Vandas, M
EM: vandas@ig.cas.cz
AF: Astronomical Institute, Academy of Sciences of the Czech Republic, Bocni II 1401, Praha 4, 141 31 Czech Republic
AU: Watanabe, T
EM: watanabe@env.sci.ibaraki.ac.jp
AF: Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki, 310-8512 Japan
AB: Intervals of long-duration radial interplanetary magnetic fields (IMFs) were studied using the OMNI database for the period of approximately forty years. Long-duration radial IMF events were detected in various regimes of solar wind. It was found that long-duration radial IMF events frequently occur around solar minimum and are rarer near solar maximum. The events tend to occur in decreasing solar wind speed through solar cycle. The decreasing rates of solar wind speed associated with the events do not clearly depend on the solar activity.
DE: 2134 Interplanetary magnetic fields
DE: 2162 Solar cycle variations (7536)
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2004 AGU Fall Meeting