IGRF candidate models at times of rapid changes in core field acceleration

Details IGRF candidate models at times of rapid changes in core field acceleration IGRF candidate models at times of rapid changes in core field acceleration

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ep%26s...62..753t&link_type=abstract

Earth, Planets and Space, Volume 62, Issue 10, p. 753-763.

Computer Science

2

Scientific paper

We submit three candidate models following the call for IGRF-11. We apply a simple modeling approach in spherical harmonics based on a quadratic Taylor expansion for the internal field time variations. We use the Dst magnetic index as a proxy for the external field variations. In order to compensate for the limitations incurred by such a conventional approach, we focus on the optimal selection of satellite data in space and time. We also show that some a priori knowledge about the core field state helps us to avoid the pitfall encountered in the case of rapid changes of core field accelerations. Indeed, various acceleration events of relevance for the IGRF 11th occurred between 2003 and 2010, one of them being a geomagnetic jerk. They could entail disagreements between IGRF candidate models for the secular variation (SV) if data prior to 2008 are used. Our SV and main field (MF) candidate models have a root mean square uncertainty less than 6 nT/yr and 8 nT, respectively, with respect to the modeled magnetic field contributions. These values correspond to the intrinsic error associated with truncating SV and MF models to spherical harmonic degree 8 and 13, respectively, as requested for IGRF models.

Affiliated with

Also associated with

No associations

Rating

IGRF candidate models at times of rapid changes in core field acceleration 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 IGRF candidate models at times of rapid changes in core field acceleration, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and IGRF candidate models at times of rapid changes in core field acceleration will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1230815