This dataset includes 5-second resolution ground magnetometer data from the York and Glenmore Lodge stations of the UK Sub-Auroral Magnetometer Network (SAMNET) between 12-14 March 1989.

Until 31st March 2003 SAMNET was operated by the University of York. SAMNET is currently operated by the Space and Planetary Physics group, Department of Physics, Lancaster University (https://www.lancaster.ac.uk/physics/research/astrophysics/space-and-planetary-physics/). It is also part of the international SuperMAG consortium. Stations are equipped with fluxgate magnetometers which continuously record natural variations in the Earth's magnetic field. The magnetometer data contains information about the complex interactions within the coupled Solar Wind-Magnetosphere-Ionosphere system.

Station locations in geographic coordinates:
Glenmore: lat 57.16N, long 356.32E
York: lat 53.95N, long358.95E

Each station records the magnetic field in three orthogonal components: H, D and Z, these being Horizontal Magnetic Northwards, Horizontal Magnetic Eastwards and vertically downwards.

The data format is as follows:

Headers: one per hour.
structure: SSDD/MM/YYYY hhmmss rr gggg
(fortran format: 2A1,I2.2,'/',I2.2,'/',I4.4,1X,3(I2.2),1X,I2.2,1X,4A1)
(c format: %c%c%2.2d/%2.2d/%4.4d %2.2d%2.2d%2.2d %2.2d %4.4x)
SS=station code
DD=day of month
MM=month
YYYY=year
hh=hour
mm=minute
ss=second
rr=resolution (05 second)
gggg=placeholder for gps information (not used in this format,
contact us for further information)
Data: 3 columns, Geomagnetic H, D, Z components (all in nT)
structure: hhhh.hh dddd.dd zzzz.zz
(fortran format: F7.2,1X,F7.2,1X,F7.2)
(c format: %7.2f %7.2f %7.2f)
hhhh.hh=geomagnetic northward component, nT
dddd.dd=geomagnetic eastward component, nT
zzzz.zz=vertically downward component, nT

The missing data value is 9999.9

The data is freely available for bona-fide research purposes. Please acknowledge usage with "The Sub-Auroral Magnetometer Network (SAMNET) data is provided by Lancaster University (UK) and we acknowledge the PI, Prof. Farideh Honary."

Queries can be directed to the SAMNET PI, Prof Farideh Honary (f.honary@lancaster.ac.uk.)