Overview:
- look-up tables for 6 confidence levels difficult to implement in error models
• tables are for BGGM only
• using the 95.4% table
- for declination investigate revising error terms AZ (constant) and DBH (H dependent)
- provide 1 table that contains appropriate 1-sigma values for error propagation purposes and multiplying up for confidence of upwards of 95%
Global Data Gathering Efforts - Ground
• BGS part of the new ICSU Interdisciplinary Body, the World Data System
• BGS has lead role in INTERMAGNET
• Currently there are ~160 observatories, in 2011 more than 100 are members of INTERMAGNET
Global Statistics
- Conclusion: prediction of SF almost as good (on average) as the
current method over two years
- Caveats: BGGM prediction has acceleration, SF does not yet
- Next step: include acceleration into flow models
....
View the entire Presentation:
Recent Development in Geomagnetic Referencing
Susan Macmillan, Brian Hamilton and Ciaran Beggan - British Geological Survey