HR: 0800h
AN: SH41A-1077    [Abstracts]
TI: A New Magnetoseismic Chain in East Asia
AU: Gao, Y F
EM: gaoyf@public.bta.net.cn
AF: Institute of Geophysics, China Seismological Bureau, 5 Min Zu Xue Yuan Nan Lu, Beijing, 100081 China
AU: * Chi, P J
EM: pchi@igpp.ucla.edu
AF: UCLA, Institute of Geophysics and Planetary Physics, Box 951567, Los Angeles, CA 90095-1567 United States
AU: Russell, C T
EM: ctrussell@igpp.ucla.edu
AF: UCLA, Institute of Geophysics and Planetary Physics, Box 951567, Los Angeles, CA 90095-1567 United States
AB: A surge of using ground magnetometer data to estimate the plasma density in the magnetosphere took place in the last decade as a result of the advancements in field line resonance (FLR) observations as well as in ground magnetometry. This application of FLR observations requires pairs of magnetometers closely separated in the north-south direction. Measuring FLR-inferred density has been an important objective of several magnetometer projects in North America and Europe. Many magnetometers also exist in Australia and Asia, but the stations available there for magnetoseismic studies are limited in magnetic latitude. Because ground FLR signatures are often observed in the daytime, the reliance of the North American and European networks implies that there are roughly 4 hours per day when no FLR-inferred density can be estimated because neither network is located in the daytime. In addition, plasma density can have a strong dependence on local time, and the spatiotemporal distribution of the density cannot possibly be resolved by one or two meridian chains. Here we present a proposal of a new magnetometer chain that can provide the magnetoseismic data in the East Asia region. The project is an extension of the Sino-Magnetic Array at Low Latitudes (SMALL) magnetometer network that consists of 12 high-resolution UCLA fluxgate magnetometers. The existing SMALL stations are supplemented by new stations along the $190^\circ$ magnetic meridian to make possible the gradient analysis for identifying FLR frequencies. Both existing and new systems are equipped with GPS to ensure proper synchronization across the stations. The new magnetoseismic chain in East Asia will nicely complement the North American and European magnetoseismic chains as the difference in local time from either chain would be roughly 8 hours. The data provided by new magnetometers would also be valuable resources for a variety of research subjects of magnetospheric physics.
DE: 2730 Magnetosphere--inner
DE: 2731 Magnetosphere--outer
DE: 2752 MHD waves and instabilities
DE: 2794 Instruments and techniques
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2004 AGU Fall Meeting