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Advances in the global geomagnetic observatory network

Advances in the global geomagnetic observatory network. Jürgen Matzka DTU Space, Technical University of Denmark with contributions from Ellen Clarke & Susan Macmillan, BGS; B. Veenadhari , IIG Roman Krasnoperov & Anatoly Soloviev , GC RAS; Bill Worthington, USGS

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Advances in the global geomagnetic observatory network

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  1. Advances in the global geomagnetic observatory network Jürgen Matzka DTU Space, Technical University of Denmark with contributions from Ellen Clarke & Susan Macmillan, BGS; B. Veenadhari, IIG Roman Krasnoperov& Anatoly Soloviev, GC RAS; Bill Worthington, USGS Xavier Lalanne, IPGP; Jean-Michel Léger, Leti Laszlo Hegymegi, MinGeo Achim Linthe, GFZ

  2. My background: DTU Space geomagneticobservatories(THL, GDH, NAQ, BFE, TDC)and 15 variometer stations, most of them in Greenland.

  3. Geomagneticobservatoriesworldwide CourtesyMacmillan

  4. Instruments for geomagneticobservatories. Variometer DI-flux to measure directionabsolutely.

  5. New development: Optical system to controldeclination baseline of a dIdD instrument. Courtesy Hegymegi

  6. Based on an 4He atomic resonance SCALAR magnetometer superposition of 3 AC modulations along 3 orthogonal directions Real time analysis of the scalar output Absolutevector magnetometer for observatories based on Swarm ASM-V. Courtesy Léger

  7. Hyderabad geomagneticobservatory, NGRI, India

  8. Hornsund, Polish geomagneticobservatory on Spitsbergen

  9. Geomagnetic storm recorded at variouslatitudes • Observatories: • Long term record of spaceweather -> spaceclimate • Data selectioncriteria • Temporal correction of survey data • Long period EM induction • Part of thiscouldbe done by variometer stations.

  10. Quiet time geomagnetic variations

  11. Secular variation time series

  12. Global organization of observatories • IAGA • Support to observatoriesthroughtraining, instrument comparisons, resolutions. • Requiresabsolutemeasurements, approves station code, onlyinterested in definitive data. Data quality is operators responsibility. • WDC and new WDS • Wish to provide data and metadata also to geomagnetic non-experts. • For example to GEOSS ‘Global Earth Observation System of Systems’. GEOSS provides decision-support tools to a wide variety of users. • Intermagnet (consortium of observatory operators) • Checks quality of observatories and data (definitive) • Near real time and definitive data • Watch out for 1-second and Quasidefinitve data.

  13. Quiet time geomagnetic variations

  14. Regional Networks CourtesyVeenadhari

  15. Indian geomagneticobservatoriessortedafter dip latitude. CourtesyVeenadhari

  16. Approved and potential places for new observatories in Russia. CourtesyKrasnoperov

  17. Total fieldgrid and azimuth determination, Russia CourtesyKrasnoperov

  18. New repeat station network, new method in France CourtesyLalanne

  19. Baselines for College, Alaska: 2 differentmethodscompared Courtesy Worthington

  20. Quality check of observatory data • In preparation for the Swarm mission files of good quality observatory hourly means in a particular format and updated once every 3 months are required. These data should • contain minimal measurement noise • be as complete as possible (no data gaps in time) • be corrected to absolute values over multi-year periods, i.e. drift-free • be without discontinuities • be in geocentric coordinate frame and time- and position-stamped • To meet these requirements misfits of spherical harmonic models can be inspected in temporal and spatial domains. Pre-processing removes all known signals, i.e. core, crust and quiet-time ionosphere, and the modelling fits most of the remaining coherent field on an hourly basis. The misfits mainly represent measurement artefacts on the 0-10 nT scale (Macmillan and Olsen, 2013). CourtesyMacmillan

  21. Quality check of observatory data CourtesyMacmillan

  22. Digititalcapture of magnetograms, BGS 472 years >300,000 magnetograms Courtesy Clarke

  23. Digitization of geomagnetic storms Courtesy Clarke

  24. Baselines Qeqertarsuaq, Greenland, from 29/9-2010 to 3/8-2012 blue: before time correction red: after time correction x : absolutes by Jürgen Matzka x

  25. Increase global cooperation, decreaseobservatorysize CourtesyLinthe

  26. Thule Air Base (TAB), Greenland, variometer established JUN 2013 variometer hut: electronicshut:

  27. Variometer hut Thule Air Base Variometer hut inside: Sensor heating ca. 40 cm distance

  28. Thanks to the contributors. Thank you for your attention. Photo: Stefan Christmann, Neumayer Station, Antarctica

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