Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh41a1077g&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SH41A-1077
Physics
2730 Magnetosphere: Inner, 2731 Magnetosphere: Outer, 2752 Mhd Waves And Instabilities, 2794 Instruments And Techniques
Scientific paper
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 190o 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.
Chi Peter J.
Gao Ying-Fang
Russell Christopher T.
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