CHAOS-2-a geomagnetic field model derived from one decade of continuous satellite data

Details CHAOS-2-a geomagnetic field model derived from one decade of continuous satellite data CHAOS-2-a geomagnetic field model derived from one decade of continuous satellite data

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009geoji.179.1477o&link_type=abstract

Geophysical Journal International, Volume 179, Issue 5628, pp. 1477-1487.

Astronomy and Astrophysics

Astronomy

20

Magnetic Anomalies: Modelling And Interpretation, Rapid Time Variations, Satellite Magnetics, Core, Outer Core And Inner Core

Scientific paper

We have derived a model of the near-Earth's magnetic field using more than 10 yr of high-precision geomagnetic measurements from the three satellites Ørsted, CHAMP and SAC-C. This model is an update of the two previous models, CHAOS (Olsen et al. 2006) and xCHAOS (Olsen & Mandea 2008). Data selection and model parameterization follow closely those chosen for deriving these models. The main difference concerns the maximum spherical harmonic degree of the static field (n = 60 compared to n = 50 for CHAOS and xCHAOS), and of the core field time changes, for which spherical harmonic expansion coefficients up to n = 20 are described by order 5 splines (with 6-month knot spacing) spanning the years from 1997.0 to 2009.5.
Compared to its predecessors, the temporal regularization of the CHAOS-2 model is also modified. Indeed, second and higher order time derivatives of the core field are damped by minimizing the second time derivative of the squared magnetic field intensity at the core-mantle boundary. The CHAOS-2 model describes rapid time changes, as monitored by the ground magnetic observatories, much better than its predecessors.

Affiliated with

Also associated with

No associations

Rating

CHAOS-2-a geomagnetic field model derived from one decade of continuous satellite data does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with CHAOS-2-a geomagnetic field model derived from one decade of continuous satellite data, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and CHAOS-2-a geomagnetic field model derived from one decade of continuous satellite data will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1887682