HR: 1340h
AN: SH43A-1098    [Abstracts]
TI: Local and Global Aspects of Galactic Cosmic Ray Modulation
AU: * Ahluwalia, H S
EM: hsa@unm.edu
AF: University of New Mexico, Dept of Physics & Astronomy 800 Yale Blvd NE, Albuquerque, NM 87131-1156 United States
AB: Galactic cosmic rays (GCR) are modulated by the solar wind in the heliosphere. A part of the modulation arises from local effects at earth's orbit due to the dynamics of the source regions of the interplanetary magnetic field and the solar wind while the rest of it arises from happenings in the outer heliosphere. The differences in the two kinds of contributions need to be clarified to understand the correlation between GCR modulation and the time variations of geomagnetic index Ap. We discuss our insights based on analyses of cosmic ray data obtained with the detectors on ground and on board the balloons and near earth satellites; they respond to a broad range of GCR spectrum at earth's orbit spanning rigidities of 1 GV to 100 GV. The physical significance of our findings will be discussed.
DE: 2104 Cosmic rays
DE: 2134 Interplanetary magnetic fields
DE: 2162 Solar cycle variations (7536)
DE: 2164 Solar wind plasma
DE: 2169 Sources of the solar wind
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2004 AGU Fall Meeting