UK 2009-2010 repeat station report

The British Geological Survey is responsible for conducting the UK geomagnetic
repeat station programme. Measurements made at the UK repeat
station sites are used in conjunction with the three UK magnetic
observatories: Hartland, Eskdalemuir and Lerwick, to produce a regional
model of the local field each year. The UK network of repeat stations comprises
41 stations which are occupied at approximately 3-4 year intervals.
Practices for conducting repeat station measurements continue to evolve as
advances are made in survey instrumentation and as the usage of the data
continues to change. Here, a summary of the 2009 and 2010 UK repeat
station surveys is presented, highlighting the measurement process and
techniques, density of network, reduction process and recent results.