HR: 13:40h
AN: U42A-01 INVITED     [PDF]
TI: Investigating the Nature of the Current Decrease of the Earth's Magnetic Dipole Moment
AU: * Hulot, G
EM: hulot@kasei.gsfc.nasa.gov, gh@ipgp.jussieu.fr
AF: NAS/NRC at GSFC/NASA, Geodynamics Branch, Code 921, Greenbelt, MD 20771 United States
AU: * Hulot, G
EM: hulot@kasei.gsfc.nasa.gov, gh@ipgp.jussieu.fr
AF: IPGP/CNRS, 4, Place Jussieu, BP89, Paris, 75005 France
AU: Langlais, B
EM: langlais@ltpmail.gsfc.nasa.gov
AF: NAS/NRC at GSFC/NASA, Geodynamics Branch, Code 921, Greenbelt, MD 20771 United States
AB: The Earth's dipole moment is currently decreasing fast, at a much faster pace than the one it would experience were this pace due to a free diffusive dipole decay mode. This suggests that an active process is going on that is responsible for this current decay. In this paper we will briefly review various aspects of the present field behavior, which could be related to this fast decay of the dipole and which could thus provide us with some information about the processes that could be responsible for it. Of particular interest is the fact that both the field and its secular variation display a strong hemispheric Pacific/Atlantic asymmetry. Also of interest is the amount of diffusion involved in the process. All those issues will be discussed in view of recent satellite data.
DE: 1507 Core processes (8115)
DE: 1555 Time variations--diurnal to secular
DE: 1560 Time variations--secular and long term
SC: U
MN: 2003 Fall Meeting