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SUMMARY:The response of the coupled magnetosphere-ionosphere-thermosphere 
  system to changes in the dipole moment of the Earth's magnetic field - Dr
  Ingrid Cnossen (NCAR)
DTSTART:20120106T140000Z
DTEND:20120106T150000Z
UID:TALK35108@talks.cam.ac.uk
CONTACT:Dr Scott Hosking
DESCRIPTION:The strength of the Earth’s magnetic field changes over time
 . Over the past 800\,000 years the Earth’s magnetic dipole moment has fl
 uctuated between values of 1e22 Am2 to 10e22 Am2\, with the current value 
 being approximately 7.7e22 Am2. While the present-day magnetic field is re
 latively strong in a geological context\, the dipole moment has been stead
 ily decreasing since ~1840 at a rate of 5-7% per century. If this declinin
 g trend continues\, we can thus expect a considerably weaker magnetic fiel
 d over centuries to come. A change in the magnetic field strength has cons
 equences for the Earth’s magnetosphere\, ionosphere\, and thermosphere. 
 Based on simulations with the Coupled Magnetosphere-Ionosphere-Thermospher
 e (CMIT) model\, I will show how a range of magnetospheric and upper atmos
 pheric variables change as a function of the geomagnetic dipole moment and
  derive scaling relations where possible. The influence of the background 
 solar activity level is also investigated. Finally\, I will discuss to wha
 t extent changes in magnetic field strength may have contributed to observ
 ed long-term trends in the ionospheric F2 layer and the solar quiet (Sq) c
 urrent system.
LOCATION:British Antarctic Survey\, Room 307
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