Finnish pulsation magnetometer chain

spaceweb@oulu.fi - last update: 23 November 2004 (RR)

You can find some data plots also in our ftp-server.

The Space Physics Group of Oulu maintains a national chain of search coil magnetometers (0.1 s sampling). These instruments are capable of measuring geomagnetic pulsations (ULF waves) in the whole Pi/Pc - frequency range (from several mHz up to to 4 Hz; cf. to eg. Pc1) with a resolution of 1 pT/s at 1 Hz. In comparison with ordinary magnetometers, pulsation magnetometers provide superior identification of substorm onsets and/or intensification via PiB pulsations. The chain was managed by Dr. Tilmann Bösinger till 1999. Lately the responsibility for the chain was transferred to the Sodankylä Geophysical Observatory, beside a low latitude station in Crete (35.15  N, 25.20 E) which is up to now solely operated by the Space Physics Group.

Some publications by the Oulu group related to the network

• Lukkari, L., J. Kangas, and R.R. Heacock, Simultaneous observations of evening magnetic pulsations and morning electron precipitation events in the auroral-zone during the substorm, J. atmos. terr. Phys., 37, 1305, 1975.
• Kangas, J., L. Lukkari, and R.R. Heacock, Observations of evening magnetic pulsations in the auroral zone during the substorms, J. atmos. terr. Phys., 38, 1177, 1976.
• Lukkari, L. and J. Kangas, Simultaneous ULF-wave and strong riometer absorption events at the plasmapause latitude in the afternoon sector, J. atmos. terr. Phys., 38, 1187, 1976.
• Lukkari, L., J. Kangas, and H. Ranta, Correlated electron precipitation and magnetic IPDP events near the plasmapause, J. Geophys. Res., 82, 4750, 1977.
• Kangas, J., T. Pikkarainen, Yu. Golikov, L. Baransky, V. Sterlikova., and V.A. Troitskaya, Bursts of irregular magnetic pulsations during the substorm, J. Geophys., 46, 237, 1979.
• Bösinger, T., K. Alanko, J. Kangas, H. Opgenoorth, and W. Baumjohann, Correlation between PiB type magnetic pulsations, auroras and equivalent current structures during 2 isolated substorm, J. atmos. terr. Phys., 43, 933, 1981.
• Pikkarainen, T., J. Kangas, B. Kiselev, N. Maltseva, R. Rakhmatulin, and S. Solovjev, Type IPDP magnetic pulsations and the development of their sources, J. Geophys. Res., 88, 6204, 1983.
• Chernouss, S. A., V. R. Tagirov, M. A. Chernouss, J. Kangas, J. Leinonen, and M. Kivinen, Auroral and magnetic pulsations in the morning sector of the auroral zone, Geophysica, 21, 19-37, 1985.
• Kiselev, V., A. Koslovski, and J. Kangas, IPDP type pulsations and the development of disturbances in the evening sector of the magnetosphere, Geomagn. Aeron., 25, 874-876, 1985.
• Maltseva, N. F., L. T. Afanasieva, V. A. Troitskaya, T. Pikkarainen, H. Ranta, A. Ranta, and J. Kangas, On the radial displacement of sources of OPDP (oscillations of decreasing period) and localized outpourings of high-energy electrons, Geomagn. Aeron., 25, 359-, 1985.
• Kangas, J., A. Aikio, and J. V. Olson, Multistation correlation of ULF pulsation spectra associated with sudden impulses, Planet. Space Sci., 34, 543-553, 1986.
• Pikkarainen, T., J. Kangas, H. Ranta, A. Ranta, N. Maltseva, V. Troitskaya and L. Afanasieva, Riometer absorption events in the evening-to-afternoon sector of the auroral and sub-auroral zone and movements of the IPDP source, J. Atmos. Terr. Phys., 48, 585-596, 1986.
• Bösinger, T., and A.G. Yahnin, Pi1B type magnetic pulsations as a high time resolution monitor of substorm development, Ann. Geoph., A5, 231-238, 1987.
• Bösinger, T., and U. Wedeken, Pi1B type magnetic pulsations simultaneously observed at mid and high latitudes, J. Atmos. Terr. Phys., 49, 573-598, 1987.
• Kangas, J., T. Pikkarainen, and J.V. Olson, Simultaneous observations of IPDP type wave events in the evening and morning hours. Planet. Space Sci., 35, 827-832, 1987.
• Pikkarainen, T., Statistical results of IPDP pulsations recorded in Finland during 1975 - 1979, Geophysica, 23, 1-19, 1987.
• Maltseva, N., J. Kangas, T. Pikkarainen, and J. Olson, Solar cycle effects in Intervals of Pulsations of Diminishing Periods pulsation activity, J. Geophys. Res., 93, 5937-5941, 1988.
• Kaila, K., R. Rasinkangas, P. Pollari, R. Kuula, J. Kangas, T. Turunen and T. Bösinger, High resolution measurements of pulsating aurora by EISCAT, optical instruments and pulsation magnetometers, Adv. Space Res., 9, (5)53-(5)56, 1989.
• Bösinger, T., On the spectral index of the Pi1B power spectrum, Ann. Geophys., 7, 375-386, 1989.
• Mursula, K., J. Kangas, T. Pikkarainen and M. Kivinen, Pc 1 micropulsations at a high-latitude station: A study over nearly four solar cycles. J. Geophys. Res., 96, 17651-17661, 1991.
• Mursula, K., J. Kangas, and T. Pikkarainen, Properties of structured and unstructured Pc1 pulsations at high latitudes: Variation over the 21st solar cycle. Solar wind sources of magnetospheric ultra-low-frequency waves, Editors: M.J. Engebretson, K. Takahashi and M. Scholer, AGU Geophys. Monogr., 81, 409-415, 1994.
• Rasinkangas, R., K. Mursula, G. Kremser, H.J. Singer, B.J. Fraser, A. Korth, and W.J. Hughes, Simultaneous occurrence of Pc 5 and Pc 1 pulsations in the dawnside magnetosphere: CRRES observations. Solar wind sources of magnetospheric ultra-low-frequency waves, Editors: M.J. Engebretson, K. Takahashi and M. Scholer, AGU Geophys. Monogr., 81, 417-424, 1994.
• Bösinger, T., K. Kaila, R. Rasinkangas, P. Pollari, J. Kangas, V. Trakhtengerts, A. Demekhov, and T. Turunen, An EISCAT study of a pulsating auroral arc: simultaneous ionospheric electron density, auroral luminosity and magnetic field pulsations, J. Atmos. Terr. Phys., 58, 23-35, 1996.
• Erlandson, R.E., K. Mursula, and T. Bösinger, Simultaneous ground-satellite observations of structured Pc 1 pulsations. J. Geophys. Res., 101, 27,149-27,156, 1996.
• Guglielmi, A., F. Feygin, K. Mursula , J. Kangas, T. Pikkarainen, and A. Kalisher, Fluctuations of the repetition period of Pc1 pearl pulsations, Geophys. Res. Lett., 23, 1041-1044, 1996.
• Guglielmi, A., J. Kangas, K. Mursula, T. Pikkarainen, O. Pokhotelov, and A. Potapov, Pc1 induced electromagnetic lift of background plasma in the magnetosphere, J. Geophys. Res., 101, 21,493-21,500, 1996.
• Kleimenova, N.G., J. Kangas, T. Pikkarainen, and H. Ranta, IPDP geomagnetic pulsations and the main ionospheric trough (English Translation), Geomagn. Aeron., 35, 773-780, 1996.
• Mursula, K., B.J. Anderson, R.E. Erlandson, and T. Pikkarainen, Solar cycle change of Pc1 waves observed by an equatorial satellite and on the ground, Adv. Space Res., 17, (10)51-(10)55, 1996.
• Mursula, K., R. Rasinkangas, T. Bösinger, R.E. Erlandson, and P.-A. Lindqvist: Nonbouncing Pc 1 wave bursts. J. Geophys. Res., 102, 17611-17624, 1997.
• Rasinkangas, R. and K. Mursula, Modulation of magnetospheric EMIC waves by Pc 3 pulsations of upstream origin, Geophys. Res. Lett., 25, 869-872, 1998.

See also:

• Space Physics Group of Oulu Home Page