[2] There is a long history of magnetic observations in Borok. Since the establishment of the Borok Geophysical Observatory (BGO) by the Schmidt's Institute of Physics of the Earth of the Russian Academy of Sciences (IPERAS) in 1957, ultra-low-frequency (ULF) geomagnetic pulsations have been recorded in Borok. From 1976 to 2001, a magnetic observatory was in operation on the BGO campus, under the responsibility of the Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation (IZMIRAN). The geomagnetic field was recorded on photographic paper by a three-component Bobrov-type magnetometer. Since 1998, geomagnetic variations have been recorded by a triaxial fluxgate magnetometer belonging to SAMNET, the UK Sub-Auroral Magnetometer Network.
[3] In 2002, IPERAS and BGO started a collaboration with the Institute of Physics of the Earth in Paris (IPGP) to install and operate an INTERMAGNET magnetic observatory in Borok. INTERMAGNET is the global network of digital magnetic observatories adopting modern standard specifications for measuring and recording the Earth's magnetic field variations on long time scales. Data from INTERMAGNET observatories are transmitted in quasi-real time via Geomagnetic Information Nodes to the scientific community and are available at www.intermagnet.org. INTERMAGNET has regularly expanded since its foundation in the late 1980s and now comprises more than hundred observatories throughout the world (107 in 2007). In April 2004, BGO and IPGP installed new magnetometers in Borok, after which the observatory gained official INTERMAGNET magnetic observatory (IMO) status.
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Figure 1 |
[5] The present paper describes the layout and instruments of the Borok INTERMAGNET observatory. It presents the data acquired since 2004 and assesses their quality. Finally, the future of ground magnetic observatories such as Borok in the magnetic satellite era is briefly discussed.
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