A netcdf-formatted file containing the original binned data (described in Shore et al ), in their state before they were subjected to EOF analysis.
These have had additional processing applied to the SuperMAG data (publically available at http://supermag.jhuapl.edu/) in the form of sampling them to the centroid of the bins, thus they are worth providing here despite the large file size (approximately 12GB).
To conserve file space, we have removed empty bins, thus the temporal and spatial basis for these data are provided for each filled bin element. Please note that the binned data had not had the temporal mean values (described in Shore et al , and available in the Supporting Information) removed when they were stored in this netcdf file.
The file contains 144 (monthly) sets of 8 variables.
Variables 5 and 6 are the co-latitude and longitude coordinates of each filled bin element.
The 5-minute-mean epoch of each filled bin element, with columns in the order: year, month, day, hour, minute, second).
A set of fiducial values describing how the sparse elements of the 1D vector of filled bin values relate to the fiducials of the (transposed!) EOF prediction a 2D matrix product of the spatial and temporal eigenvectors with values in every bin.
An example of the usage of these data is given in the MATLAB program Shore-ms01.m, provided in the Supporting Information of Shore et al .
***** PLEASE BE ADVISED TO USE VERSION 2.0 DATA *****
The VERSION 2.0 data set has been corrected for a bug which led to the bins which span the local midnight meridian having fewer samples than they should. The data density in these bins is now in-line with the rest of the polar coverage. Apart from that change, the original and updated data sets are the same.
Shore, R.M; Freeman, M.P.; Wild, J.A.; Gjerloev, J.W. (2017). A high resolution model of the external and induced magnetic field at the Earth's surface in the Northern Hemisphere. J.Geophys. Res. Space Physics, 122, 2440-2454. doi:10.1002/2016JA023682
Data Set Creator
Shore, R.M; Freeman, M.P.; Gjerloev, J.W.
Data Set Title
An empirical orthogonal function reanalysis of the northern polar external and induced magnetic field during solar cycle 23 - VERSION 2.0