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Quiet-time magnetic variations at high latitude observatories


The quiet-time geomagnetic variations at high latitudes have not been systematically studied so far. Here we present quiet-time variation results from more than two years of continuous magnetic observations in Fennoscandia and Svalbard using the IMAGE magnetometer network. The CHAMP CO2 model is found to yield an excellent secular variation correction with a simple linear trend. The effect of the magnetospheric ring current on the quiet-time field values for each component is presented with the coefficients for the expected linear correlation with the DST index. A general trend for these coefficients is found for the CGM latitudes from 54 to 68 degrees. In this area the diurnal variation is well in accordance with the expected seasonal Sq behaviour. North of the Fennoscandian mainland the DST coefficients and the diurnal variations show an unexpected behaviour and additional current systems are presented as a likely cause. An objective, automated baseline method used in this study is also introduced as a method useful for various applications.


  • Cafarella, L., A. Meloni, and P. Palangio, Solar cycle 22 control on daily geomagnetic variation at Terra Nova Bay (Antarctica), Annali di Geofisica, 41, 805–811, 1998.

    Google Scholar 

  • Campbell, W. H., The regular geomagnetic field variations during quiet solar conditions, in Geomagnetism, edited by J. A. Jacobs, Vol. 3, pp. 385–460, 1989.

    Google Scholar 

  • Campbell, W. H., Introduction to Geomagnetic Fields, pp. 62–102, Cambridge University Press, 1997.

    Google Scholar 

  • Chapman, S. and J. Bartels, Geomagnetism, Clarendon Press, Oxford, 1940.

    Google Scholar 

  • Detrick, D. L. and L. J. Lanzerotti, Geomagnetic quiet-time (Sq) variations at high latitudes, Geophys. Res. Lett., 28, 2581–2584, 2001.

    Article  Google Scholar 

  • Friis-Christensen, E. and J. Wilhjelm, Polar cap currents for different directions of the interplanetary magnetic field in the Y-Z plane, J. Geophys. Res., 80, 1248–1260, 1975.

    Article  Google Scholar 

  • Hibberd, F. H., The geomagnetic Sq variation—annual, semiannual and solar cycle variations and ring current effects, J. Atmos. Terres. Phys., 47, 341–352, 1985.

    Article  Google Scholar 

  • Holme, R., N. Olsen, M. Rother, and H. Lühr, CO2—A CHAMP magnetic field model, in First CHAMP Mission Results for Gravity, Magnetic and Atmospheric Studies, edited by C. Reigber, H. Lühr, and P. Schwintzer, pp. 220–225, Springer, 2003.

    Google Scholar 

  • Kauristie, K., T. I. Pulkkinen, R. J. Pellinen, and H. J. Opgenoorth, What can we tell about global auroral-electrojet activity from a single meridional magnetometer data?, Ann. Geophys., 14, 1177–1185, 1996.

    Article  Google Scholar 

  • Lühr, H., A. Aylward, S. C. Bucher, A. Pajunpää, K. Pajunpää, T. Holmboe, and S. M. Zalewski, Westward moving dynamic substorm features observed with the IMAGE magnetometer network and other ground-based instruments, Ann. Geophys., 16, 425–440, 1998.

    Article  Google Scholar 

  • Matsushita, S., Solar quiet and lunar daily variation fields, in Physics of Geomagnetic Phenomena—International Geophysics Series, Vol. 11-I, edited by S. Matsushita and W. H. Campbell, pp. 301–424, 1967.

    Google Scholar 

  • Nagata, T. and S. Kokubun, An additional geomagnetic daily variation field (S pq -field) in the polar region on geomagnetically quiet day, Rept. Ionosph. Space Res. Japan, 16, 256–274, 1962.

    Google Scholar 

  • Ritter, P., H. Lühr, A. Viljanen, O. Amm, A. Pulkkinen, and I. Sillanpää, Ionospheric currents estimated simultaneously from CHAMP satellite and IMAGE ground based magnetic field measurements: a statistical study at auroral latitudes, Ann. Geophys., 2004 (in press).

  • Viljanen, A. and L. Häkkinen, IMAGE magnetometer network, in Satellite-Ground Based Coordination Sourcebook, edited by M. Lockwood, M. N. Wild, and H. J. Opgenoorth, ESA publications SP-1198, p. 111–117, 1997.

  • Xu, W.-Y., Polar region Sq, in Quiet Daily Geomagnetic Fields, edited by W. H. Campbell, pp. 317–393, Birkhäuser Verlag, Basel, 1989.

    Google Scholar 

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Correspondence to I. Sillanpää.

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Sillanpää, I., Lühr, H., Viljanen, A. et al. Quiet-time magnetic variations at high latitude observatories. Earth Planet Sp 56, 47–65 (2004).

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