Publications

- Main-author papers:

Journal and other refereed papers:

1. Amm, O., Direct determination of the local ionospheric Hall conductance distribution from two-dimensional electric and magnetic field data: Application of the method using models of typical ionospheric electrodynamic situations, J. Geophys. Res., 100, 21473, 1995.
2. Amm, O., Improved electrodynamic modeling of an omega band and analysis of its current system, J. Geophys. Res., 101, 2677, 1996.
   
3. Amm, O., Ionospheric elementary current systems in spherical coordinates and their application, J. Geomagn. Geoelectr., 49, 947, 1997.
4. Amm, O., Method of characteristics in spherical geometry applied to a Harang discontinuity situation, Ann. Geophys., 16, 413, 1998.
   Download PDF file of this paper: Paper_ChMethodSpherical_Journal.pdf
5. Amm, O., Engebretson, M.J., Greenwald, R.A., Lühr, H., and Moretto, T., Direct determination of IMF BY-related cusp current systems, using SuperDARN radar and multiple ground magnetometer data - a link to theory on cusp current origin, J. Geophys. Res., 104, 17187, 1999.
6. Amm, O., and Viljanen, A., Ionospheric disturbance magnetic field continuation from the ground to the ionosphere using spherical elementary current systems, Earth, Planets and Space, 51, 431, 1999.
   Download PDF file of this paper: Paper_SECS1999_Journal.pdf
7. Amm, O., A. Pajunpää, and U. Brändström, Spatial distribution of conductances, currents, and field-aligned currents associated with a north-south auroral structure during a highly disturbed multiple-substorm period, Ann. Geophys., 17, 1385, 1999.
   Download PDF file of this paper: Paper_NSAurora_Journal.pdf
8. Amm, O., P. Janhunen, H.J. Opgenoorth, T.I. Pulkkinen, and A. Viljanen, Ionospheric shear flow situations observed by the MIRACLE network, and the concept of Harang Discontinuity, AGU monograph on magnetospheric current systems, Geophysical Monograph 118, 227, 2000.
9. Amm, O., P. Janhunen, K. Kauristie, H.J. Opgenoorth, T.I. Pulkkinen, and A. Viljanen, Mesoscale ionospheric electrodynamics observed with the MIRACLE network: 1. Analysis of a pseudobreakup spiral, J. Geophys. Res., 106, 24675, 2001.
10. Amm, O., The elementary current method for calculating ionospheric current systems from multi-satellite and ground magnetometer data, J. Geophys. Res., 106, 24843, 2001.
11. Amm, O., and K. Kauristie, Ionospheric signatures of bursty bulk flows, Surv. Geophys., 23, 1, 2002 (invited review paper).
12. Amm, O., The method of characteristics for calculating ionospheric electrodynamics from multi-satellite and ground-based radar data, J. Geophys. Res., 107 (A10), 1270, doi:10.1029/2001JA005077, 2002.
13. Amm, O., M.J. Engebretson, T. Hughes, L. Newitt, A. Viljanen, and J. Watermann, A traveling convection vortex event study: Instantaneous equivalent currents, estimation of field-aligned currents, and the role of induced currents, J. Geophys. Res., 107(A11), 1334, doi:10.1029/2002JA009472, 2002.
14. Amm, O., A. Aikio, J.-M. Bosqued, M. Dunlop, A. Fazakerley, P. Janhunen, K. Kauristie, M. Lester, I. Sillanpää, M. Taylor, A. Vontrat-Reberac, K. Mursula., and M. André, Mesoscale structure of a morning sector ionospheric shear flow region determined by conjugate Cluster II and MIRACLE ground-based observations, Ann. Geophys., 21, 1737, 2003.
15. Amm, O., A. Aksnes, J. Stadsnes, N. Østgaard, R.R. Vondrak, G.A. Germany, G. Lu, and A. Viljanen, Mesoscale  ionospheric electrodynamics of omega bands determined from ground-based electromagnetic and satellite optical observations, Ann. Geophys., 23, 325, 2005.
16. Amm, O., E.F. Donovan, H. Frey, M. Lester, R. Nakamura, J.A. Wild, A. Aikio, M. Dunlop, K. Kauristie, A. Marchaudon, I.W. McCrea, H.J. Opgenoorth, and A. Strømme, Coordinated studies of the Geospace environment using Cluster, satellite and ground-based data: An interim review, Ann. Geophys., 23, 2129, 2005.
17. Amm, O., R. Nakamura, H.U. Frey, Y. Ogawa, M. Kubyshkina, A. Balogh, and H. Rème, Substorm topology in the ionosphere and magnetosphere during a flux rope event in the magnetotail, Ann. Geophys., 24, 735, 2006.
18. Amm, O., and R. Fujii, Separation of Cowling channel and local closure currents in the vicinity of a substorm breakup spiral, J. Geophys. Res., 113, A06304, doi:10.1029/2008JA013021, 2008.
19. Amm, O., A. Aruliah, S.C. Buchert, R. Fujii, J.W. Gjerloev, A. Ieda, T. Matsuo, C. Stolle, H. Vanhamäki, and A. Yoshikawa, Understanding the electrodynamics of the 3-dimensional high-latitude ionosphere: present and future, Ann. Geophys., 26, 3913, 2008.
20. Amm, O., A. Grocott, M. Lester, and T.K. Yeoman, Local determination of ionospheric plasma convection from coherent scatter radar data using the SECS technique, J. Geophys. Res., 115, A03304, doi:10.1029/2009JA014832, 2010.
21. Amm, O., R. Fujii, K. Kauristie, A. Aikio, A. Yoshikawa, A. Ieda, and H. Vanhamäki, A statistical investigation of the Cowling channel efficiency in the auroral zone, J. Geophys, Res., 116, A02304, doi:10.1029/2010JA015988, 2011.
22. Amm, O., R. Nakamura, T. Takada, K. Kauristie, H.U. Frey, C.J. Owen, A. Aikio, and R. Kuula, Observations of an auroral streamer in a double oval configuration, Ann. Geophys., 29, 701, 2011.
    

Proceedings papers:

23. Amm, O. and A. Huuskonen, Two-dimensional monitoring of ionospheric electrodynamics using ground-based measurements, Proc. Third International Conf. on Substorms (ICS-3), Versailles, France, 12-17 May 1996, ESA SP-389.
    Download postscipt file of proceedings paper:  Proc_ICS3.ps    or    View paper in HTML form
24. Amm, O., K. Kauristie, T.I. Pulkkinen, M.J. Engebretson, R.A. Greenwald, H. Lühr, and T. Moretto, Combining multi-point spacecraft and two-dimensional ground-based observations: Theory and example of an IMF BY-related cusp current system, Proc. Cluster II workshop, ESA SP-449, 327, 1999.
    Download postscipt file of proceedings paper:  Proc_ClusterII.ps
25. Amm, O., A. Viljanen, A. Pulkkinen, I. Sillanpää, and H. Vanhamäki, Methods for combined ground-based and space-based analysis of ionospheric current systems, Proc. Fourth Oersted International Science Team Conf., Copenhagen, Denmark, September 23-27, 2002, p. 181ff., 2002.
    Download postscipt file of proceedings paper:  Proc_Oersted2002.ps
26. Amm, O., A. Aksnes, J. Stadsnes, N. Østgaard, R.R. Vondrak, G.A. Germany, and I. Sillanpää, Observations and analysis of ionospheric electrodynamics during a substorm recovery phase using the MIRACLE network, Proc. Seventh International Conf. on Substorms (ICS-7), Levi, Finland, March 21-27,  2004, Finnish Meterological Institute report 2004:5, p. 87-94, 2004.
    Download PDF file of proceedings paper:  Proc_ICS7.pdf
27. Amm, O., R. Nakamura, H.U. Frey, Y. Ogawa, M. Kubyshkina, A. Balogh, and H. Rème, Substorm topology in the ionosphere and magnetosphere during a flux rope event in the magnetotail, Proc. Cluster and Double Star Symposium, ESA SP-598, Noordwijk, The Netherlands, September 19-23, 2005.
    Download PDF file of proceedings paper:  Proc_ClusterDoubleStar2005.pdf
28. Amm, O., L. Juusola, A. Viljanen, and K. Kauristie, MIRACLE and CHAMP: Some results; MIRACLE and SWARM: Some opportunities, Proc. First SWARM International Science Meeting, ESA WPP-261, Nantes, France, May 3-5, 2006.
    Download PDF file of proceedings paper:  Proc_SWARMMeeting2006.pdf

29. Amm, O.: Comment on "A three-dimensional, iterative mapping procedure for the implementation of an ionosphere-magnetosphere anisotropic Ohm's law boundary condition in global magnetohydrodynamic simulations" by Michael L. Goodman, Ann. Geophys., 14, 773, 1996.

- Papers as a co-author:

Journal papers (refereed):

30. Pirjola, R., D. Boteler, A. Viljanen, and O. Amm, Prediction of geomagnetically induced currents in power transmission systems,  Adv. Space Res., 26, 5, 2000.
31. Viljanen, A., R. Pirjola, and O. Amm, Magnetotelluric source effect due to 3D ionospheric current systems using the complex image method for 1D conductivity structures, Earth Planets Space, 51, 933, 1999.
32. Viljanen, A., O. Amm, and R. Pirjola, Modelling geomagnetically induced currents during different ionospheric situations,  J. Geophys. Res., 104, 28059, 1999.
33. Pirjola, R., A. Viljanen, A. Pulkkinen, and O. Amm, Space weather risk in power systems and pipelines, Physics and Chemistry of the Earth, 25, 333, 2000.
34. Janhunen, P., A. Olsson, O. Amm, and K. Kauristie, Characteristics of a stable arc based on FAST and MIRACLE observations, Ann. Geophysicae, 18, 152, 2000.
35. Kosch, M.J., O. Amm, and M.W.J. Scourfield, A plasma vortex revisited: The importance of including ionospheric conductivity measurements, J. Geophys. Res., 105, 24889, 2000.
36. Tanskanen, E.I., A. Viljanen, T.I. Pulkkinen, R. Pirjola, L. Häkkinen, A. Pulkkinen, and O. Amm, At substorm onset, 40% of AL comes from underground, J. Geophys. Res., 106, 13119, 2001.
37. Kosch, M.J., M.W.J. Scourfield, and O. Amm, The importance of conductivity gradients in ground-based field-aligned current studies, Adv. Space Res., Nos 6-7, 1277, 2001.
38. Kauristie, K., M.T. Syrjäsuo, O. Amm, A. Viljanen, T.I. Pulkkinen, and H.J. Opgenoorth, A statistical study of evening sector auroral arcs and electrojets, Adv. Space Res., 28, No. 11, 1605, 2001.
39. Lockwood, M., H. Opgenoorth, A.P. van Eyken, A. Fazarkerley, J.-M. Bosqued, W. Denig, J. Wild, C. Cully, R. Greenwald, G. Lu, O. Amm, A. Strømme, P. Prikryl, M.A. Hapgood, M.N. Wild, R. Stamper, M. Taylor, I. McCrea, K. Kauristie, T. Pulkkinen, F. Pitout, A. Balogh, M. Dunlop, H. Rème, R. Behlke, T. Hansen, G. Provan, P. Eglitis, S.K. Morley, D. Alcaydé, P.-L. Blelly, J. Moen, E. Donavan, M. Engebretson, M. Lester, J. Watermann, and M.F. Marcucci, Coordinated Cluster, ground-based instrumentation and low-altitude satellite observations of transient poleward-moving events in the ionosphere and in the tail lobe, Ann. Geophys., 19, 1589, 2001.
40. Kauristie, K., T. I. Pulkkinen, O. Amm, A. Viljanen, M. Syrjäsuo, P. Janhunen, S. Massetti, S. Orsini, J. Watermann, E. Donovan, P. Prikryl, P. Eglitis, C. Smith, W. F. Denig, I. Mann, H. J. Opgenoorth, M. Lockwood, M. Dunlop, A. Vaivads, M. André, Ground­based and satellite observations of high­latitude auroral activity in the dusk sector of the auroral oval, Ann. Geophys., 19, 1683, 2001.
41. Lockwood, M., A. Fazakerley, H. Opgenoorth, J. Moen, A.P. van Eyken, M. Dunlop, J.-M. Bosqued, G. Lu, C.Cully, P. Eglitis, I.W. McCrea, M.A. Hapgood, M.N. Wild, R. Stamper, W. Denig, M. Taylor, J. Wild, G. Provan, O. Amm, K. Kauristie, T. Pulkkinen, A. Strømme, P. Prikryl, F. Pitout, A. Balogh, H. Rème, R. Behlke, T. Hansen, R. Greenwald, H. Frey, S.K. Morley, D. Alcayde, P.-L. Blelly, E. Donovan, M. Engebretson, M. Lester, J. Watermann, and M.F. Marcucci, Coordinated Cluster and ground-based instrument observations of transient changes in the magnetopause boundary layer during an interval of predominantly northward IMF: relation to reconnection pulses and FTE signatures, Ann. Geophys., 19, 1613, 2001.
42. Opgenoorth, H.J., M. Lockwood, D. Alcaydé, E. Donovan, M. J. Engebretson, A. P. van Eyken, K. Kauristie, M.Lester, J. Moen, J. Waterman, H. Alleyne, M. André, M. W. Dunlop, N. Cornilleau-Wehrlin, P. M. E. Decreau, A. Fazerkerley, H. Reme, R. André, O. Amm, A. Balogh, R. Behlke, P.L. Blelly, H. Boholm, E. Borälv, J.M. Bosqued, S. Buchert, M. Candidi, J.C. Cerisier, Ch. Cully, W.F. Denig, R. Doe, P.Eglitis, R. A. Greenwald, B. Jackal, J. D. Kelly, I. Krauklis, G. Lu, I. R. Mann, M.F. Marcucci, I. W. McCrea, M. Maksimovic, S. Massetti, A. Masson, D. K. Milling, S. Orsini, F. Pitout, G. Provan, J. M. Ruohoniemi, J. C Samson, J. J. Schott, F. Sedgemore-Schulthess, R. Stamper, P. Stauning, A. Strömme, M. Taylor, A. Vaivads, J. P. Villain, I. Voronkov, J. Wild, and M. Wild, Coordinated Ground-Based, Low Altitude Satellite and Cluster Observations on Global and Local Scales During a Transient Postnoon Sector Excursion of the Magnetospheric Cusp, Ann. Geophys., 19, 1367, 2001.
43. Mann, I.R., E. Donavan, M. Dunlop, I. Voronkov, T.K. Yeoman, D.K. Milling, J. Wild, K. Kauristie, O. Amm, S.D. Bale, A. Balogh, A. Viljanen, and H.J. Opgenoorth, Co-ordinated ground-based and Cluster II observations of large amplitude global magnetospheric oscillations during a fast solar wind speed interval, Ann. Geophys., 20, 450, 2002.
44. Pulkkinen, A., O. Amm, A. Viljanen, and BEAR working group, Ionospheric equivalent current distributions determined with the method of spherical elementary current systems, J. Geophys. Res., 108(A2), 1053, doi:10.1029/2001JA005085, 2003.
45. Partamies, N., O. Amm, K. Kauristie, T.I. Pulkkinen, and E. Tanskanen, A pseudo-breakup observation: localised current wedge associated with IMF turning, J. Geophys. Res., 108(A1), 1020, doi:10.1029/2002JA009276, 2003.
46. Kauristie, K., V.A. Sergeev, O. Amm, M.V. Kubyshkina, J. Jussila, E. Donavan, and K. Liou, BBF intrusion to the inner plasma sheet as inferred from auroral observations, J. Geophys. Res., 108(A1), 1040, doi:10.1029/2002JA009371, 2003.
47. Viljanen, A., A. Pulkkinen, O. Amm, R. Pirjola, T. Korja, and BEAR Working Group, Fast computation of the geoelectric field using the method of elementary current systems, Ann. Geophys., 22, 101, 2004.
48. Pulkkinen, A., O. Amm, A. Viljanen, and BEAR Working Group, Separation of the geomagnetic variation field on the ground into external and internal parts using the spherical elementary current system method, Earth Planets Space, 55, 117, 2003.
49. Marchaudon, A., J.-C. Cerisier, O. Amm, M. Lester, C.W. Carlson, and G.K. Parks, Quantitative modelling of the closure of meso-scale parallel currents in the nightside ionosphere, Ann. Geophys., 22, 125, 2004.
50. 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., 22, 417, 2004.
51. Uspensky, M., A. Koustov, P. Janhunen, E. Nielsen, K. Kauristie, O. Amm, R. Pellinen, H. Opgenoorth, and R. Pirjola, STARE velocities: 2. Evening westward electron flow, Ann. Geophys., 22, 1077, 2004.
52. Pirjola, R., A. Viljanen, A. Pulkkinen, S. Kilpua, and O. Amm, Ground effects of Space Weather, in: NATO Science Series Volume "Effects of Space Weather on Technology Infrastructure", Kluwer, edited by Ioannis Daglis, p. 235-256, 2004.
53. Vanhamäki, H., O. Amm, and A. Viljanen, 1-dimensional upward continuation of the ground magnetic field disturbance using spherical elementary current systems, Earth Planets Space, 55, 613, 2003.
54. Aikio, A., K. Mursula, S. Buchert, F. Formé, O. Amm, G. Marklund, M. Dunlop, D. Fontaine, A. Vaivads, and A. Fazakerley, Temporal evolution of two auroral arcs as measured by the Cluster satellite and coordinated ground-based instruments, Ann. Geophys., 22, 4089, 2004.
55. Aksnes, A., O. Amm, J. Stadsnes, N. Østgaard, G.A. Germany, R.R. Vondrak, and I. Sillanpää, Ionospheric conductances derived from satellite measurements of auroral UV and X-ray emissions, and ground-based data: A comparison, Ann. Geophys., 23, 343, 2005.
56. Nakamura, R., O. Amm, H. Laakso, N. Draper, M. Lester, A. Grocott, B. Klecker, I. W. McCrea, A. Balogh, H. Rème, and M. André, Localized fast flow disturbance observed in the plasma sheet and in the ionosphere, Ann. Geophys., 23, 553, 2005.
57. Uspensky, M., A. Koustov, V. Sofieva, O. Amm, K. Kauristie, W. Schmidt, E. Nielsen, T. Pulkkinen, R. Pellinen, S. Milan, and R. Pirjola, Multi-pulse and double-pulse velocities of STARE echoes, Radio Sci., 40, RS3008, doi:10.1029/2004RS003151, 2005.
58. Vanhamäki, H., A. Viljanen, and O. Amm, Induction effects on ionospheric electric and magnetic fields, Ann. Geophys., 23, 1735, 2005.
59. Sergeev, V.A., M.V. Kubyshkina, W. Baumjohann, R. Nakamura, O. Amm, T. Pulkkinen, V. Angelopoulos, S.B. Mende, B. Klecker, T. Nagai, J.-A. Sauvaud, J.A. Slavin, and M.F. Thomsen, Transition from substorm growth to substorm expansion phase as observed with radial configuration of ISTP and Cluster spacecraft, Ann. Geophys., 23, 2183, 2005.
60. Rosenqvist, L., H. Opgenoorth, S. Buchert, I. McCrea, O. Amm, and C. Lathuillere, Extreme solar-terrestrial events of October 2003: High latitude and Cluster observations of the large geomagnetic disturbance on October 30, J. Geophys. Res., 110, A09S23, doi:10.1029/2004JA010927, 2005.
61. Nakamura, R., W. Baumjohann, T.L. Zhang, C.M. Carr, A. Balogh, K.-H. Fornacon, E. Georgescu, H. Rème, I. Dandouras, T. Takada, M. Volwerk, Y. Asano, A. Runov, H. Eichelberger, B. Klecker, C. Mouikis, L.M. Kistler, and O. Amm, Cluster and Double Star observations of dipolarization, Ann. Geophys., 23, 2915, 2005.
62. Juusola, L., O. Amm, and A. Viljanen, One-dimensional spherical elementary current systems and their use for determining ionospheric currents from satellite measurements, Earth Planets Space, 58, 667, 2006.
63. Vanhamäki, H., O. Amm, and A. Viljanen, New method for solving inductive electric fields in the ionosphere, Ann. Geophys., 24, 2573, 2006.
64. Aikio, A.T., T. Pitkänen, A. Kozlovsky, and O. Amm, Method to locate the polar cap boundary in the nightside ionosphere and application to a substorm event, Ann. Geophys., 24, 1905, 2006.
65. Juusola, L., O. Amm, K. Kauristie, and A. Viljanen, A model for estimating the relation between the Hall to Pedersen conductance ratio and ground magnetic data derived from CHAMP satellite statistics, Ann. Geophys., 25, 721, 2007.
66. Keiling, A., M. Fujimoto, H. Hasegawa, F. Honary, V. Sergeev, V.S. Semenov, H.U. Frey, O. Amm, H. Rème, I. Dandouras, and E. Lucek, Association of Pi2 pulsations, auroral breakup and pulsed reconnection: Ground and Cluster observations in the tail lobe at 16 Re, Ann. Geophys., 24, 3433, 2006.
67. Hubert, B., K. Kauristie, O. Amm, S.E. Milan, A. Grocott, S.W.H. Cowley, and T.I. Pulkkinen, Auroral streamers and magnetic flux closure, Geophys. Res. Lett., 34, L15105, doi:10.129/2007GL030580, 2007.
68. Vanhamäki, H., O. Amm, and A. Viljanen, Role of inductive electric fields and currents in dynamical ionospheric situations, Ann. Geophys., 25, 437, 2007.
69. Yordanova, E., D. Sundkvist, S. Buchert, M. André, Y. Ogawa, M. Morooka, O. Marghitu, O. Amm, A.N. Fazakerley, and H. Rème, Energy input from the exterior cusp into the ionosphere: Correlated ground-based and satellite observations, Geophys. Res. Lett., 34, L04102, doi:10.1029/2006GL028617, 2007.
70. Vanhamäki, H., and O. Amm, A new method to estimate ionospheric electric fields and currents using data from a local ground magnetometer network, Ann. Geophys., 25, 1141, 2007.
71. Grocott, A., T.K. Yeoman, S.E. Milan, O. Amm, H.U. Frey, L. Juusola, R. Nakamura, C.J. Owen, H. Rème, and T. Takada, Multi-scale observations of magnetotail flux transport during IMF-northward non-substorm intervals, Ann. Geophys., 25, 1709, 2007.
72. Snekvik, K., S. Haaland, N. Ostgaard, H. Hasegawa, R. Nakamura, T. Takada, L. Juusola, O. Amm, F. Pitout, H. Reme, B. Klecker, and E.A. Lucek, Cluster observations of a field aligned current at the dawn flank of a bursty bulk flow, Ann. Geophys., 25, 1405, 2007.
73. Weygand, J.M., R.L. McPherron, H.U. Frey, O. Amm, K. Kauristie, A. Viljanen, and A. Koistinen, Relation of substorm onset to Harang discontinuity, J. Geophys. Res., 113, A04213, doi:10.1029/2007JA012537, 2008.
    
74. Zong, Q. G., S.Y. Fu, D.N. Baker, M.L. Goldstein, P. Song, J.A. Slavin, T.A. Fritz, J.B. Cao, O. Amm, H. Frey, A. Korth, P.W. Daly, H. Reme, and A. Pedersen, Earthward flowing plasmoid: Structure and its related ionospheric signature, J. Geophys, Res., 112, A07203, doi: 10.1029/2006JA012112, 2007.
75. Runov, A., W. Baumjohann, R. Nakamura, V.A. Sergeev, I. Alexeev, A.N. Fazakerley, C.J. Owen, O. Amm, H. Frey, B. Klecker, I. Dandouras, E. Lucek, A. Vaivads, and M. André, Observations of an active thin current sheet, J. Geophys. Res., 113, A07S27, doi:10.1029/2007JA0126852007, 2008.
    
76. Takada, T., R. Nakamura, L. Juusola, O. Amm, W. Baumjohann, M. Volwerk, A. Matsuoka, K. Snekvik, C.J. Owen, A.N. Fazakerley, H.U. Frey, B. Klecker, H. Rème, E.A. Lucek, and C. Carr, Local field-aligned currents in the magnetotail and ionosphere as observed by a Cluster, DSP, and MIRACLE conjunction, J. Geophys. Res., 113, A07S20, doi:10.1029/2007JA012759, 2008.
    
77. Aikio, A.T., T. Pitkänen, D. Fontaine, I. Dandouras, O. Amm, A. Kozlovsky, A. Vaivads, and A. Fazakerley, EISCAT and Cluster observations in the vicinity of the dynamical polar cap boundary, Ann. Geophys., 26, 87, 2008.
78. Apatenkov, S.V., V.A. Sergeev, O. Amm, W. Baumjohann, R. Nakamura, A. Runov, F. Rich, P. Daly, A. Fazakerley, I. Alexeev, J.A. Sauvaud, and Yu. Chotyaintsev, Conjugate observation of sharp dynamical boundary in the inner magnetosphere by Cluster and DMSP spacecraft and ground network, Ann. Geophys., 26, 2771, 2008.
79. Juusola, L., O. Amm, H.U. Frey, K. Kauristie, R. Nakamura, C.J. Owen, V. Sergeev, J.A. Slavin, and A. Walsh, Ionospheric signatures during a magnetospheric flux rope event, Ann. Geophys., 26, 3967, 2008.
80. Semenova, N.V., A.G. Yahnin, A.N. Vasil’ev, and O. Amm, Specific features of resonance structures in spectra of ULF electromagnetic noise at high latitudes (Barentsburg observatory), Geomagn. and Aeronomy, 48, 36, 2008.
81. Keiling, A., V. Angelopoulos, A. Runov, J. Weygand, S.V. Apatenkov, S. Mende, J. McFadden, D. Larson, O. Amm, K.-H. Glassmeier, and H. U. Auster, Substorm current wedge driven by plasma flow vortices: THEMIS observations, J. Geophys. Res., 114, A00C22, doi:10.1029/2009JA014114, 2009.
82. Nagai, T., H. Tsunakawa, H. Shibuya, F. Takahashi, H. Shimizu, M. Matsushima, M. N. Nishino, Y. Yokota, K. Asamura, T. Tanaka, Y. Saito, and O. Amm, Plasmoid formation for multiple onset substorms: Observations of the Japanese Lunar Mission “Kaguya”, Ann. Geophys., 27, 59, 2009.
83. Juusola, L., K. Kauristie, O. Amm, and P. Ritter, Statistical dependence of auroral ionospheric currents on solar wind and geomagnetic parameters from 5 years of CHAMP data, Ann. Geophys., 27, 1005, 2009.
84. Pitkänen, T., A.T. Aikio, A. Kozlowsky, and O. Amm, Reconnection electric field estimates of high-latitude boundaries during a substorm, Ann. Geophys., 27, 2157, 2009.
    
85. Juusola, L., R. Nakamura, O. Amm, and K. Kauristie, Conjugate ionospheric equivalent currents during bursty bulk flows, J. Geophys. Res., 114, A04313, doi:10.1029/2008JA013908, 2009.
86. Snekvik, K., L. Juusola, N. Østgaard, and O. Amm, Reconnection Hall current system observed in the magnetotail and in the ionosphere, Geophys. Res. Lett., 36, L08104, doi:10.1029/2009GL037239, 2009.
87. Hubert, B., A.T. Aikio, O. Amm, T. Pitkänen, K. Kauristie, S.E. Milan, S.W.H. Cowley, and J.-C. Gérard, Comparison of the open-closed field line boundary location inferred using IMAGE-FUV SI12 images and EISCAT radar observations, Ann. Geophys., 28, 883, 2010.
88. Vanhamäki, H., K. Kauristie, O. Amm, A. Senior, D. Lummerzheim, and S. Milan, Electrodynamics of an omega-band as deduced from optical and magnetometer data, Ann. Geophys., 27, 3367, 2009.
89. Zhou, X.-Y., D.G. Sibeck, O. Amm, and J.M. Ruohoniemi, Interplanetary shock generated ionospheric traveling convection vortex near local noon, Adv. Geosciences, 21, 367, 2010.
90. Juusola, L., K. Andréeova, O. Amm, K. Kauristie, S.E. Milan, M. Palmroth, and N. Partamies, Effects of a solar wind pressure pulse in the magnetosphere and in the ionosphere, Ann. Geophys., 28, 1945, 2010.
91. Frey, H.U., O. Amm, C.C. Chaston, S. Fu, G. Haerendel, L. Juusola, T. Karlsson, B. Lanchester, R. Nakamura, N. Ostgaard, T. Sakanoi, E. Seran , D. Whiter, J. Weygand, K. Asamura, and M. Hirahara, Small and meso-scale properties of a substorm onset auroral arc, J. Geophys. Res., 115, A10209, doi:10.1029/2010JA015537, 2010.
92. Vanhamäki, H., and O. Amm, Analysis of ionospheric electrodynamic parameters on mesoscales - A review of selected techniques using data from ground-based observation networks and satellites, Ann. Geophys., 29, 467, 2011.
93. Nakamura, R., W. Baumjohann, E. Panov, A. A. Petrukovich, V.Angelopoulos, M. Volwerk, W. Magnes, Y. Nishimura, A. Runov, C. T. Russell, J. M. Weygand, O. Amm, H.-U. Auster, J. Bonnell, H. Frey, D. Larson, and J. McFadden, Flux transport, dipolarization and current sheet evolution during a double-onset substorm, J. Geophys. Res., 116, A00I36, doi:10.1029/2010JA015865, 2011.
94. Fujii, R., O. Amm, A. Yoshikawa, A. Ieda, and H. Vanhamäki, Reformulation and energy flow of the Cowling channel, J. Geophys. Res., 116, A02305, doi:10.1029/2010JA015989, 2011.
95. Weygand, J.M., O. Amm, A. Viljanen, V. Angelopoulos, D. Murr, M.J. Engebretson, H. Gleisner, and I. Mann, Application and validation of the spherical elementary currents systems technique for deriving ionospheric equivalent currents with the North American and Greenland ground magnetometer arrays, J. Geophys. Res., 116, A03305, doi:10.1029/2010JA016177, 2011.
96. Pitkänen, T., A.T. Aikio, O. Amm, K. Kauristie, H. Nilsson, and K.U. Kaila, EISCAT-Cluster observations of quiet-time near-Earth magnetotail fast flows and their signatures in the ionosphere, Ann. Geophys., 29, 299, 2011.
97. Yoshikawa, A., A. Nakamizo, O. Amm, H. Vanhamäki, T. Uozumi, Y.-M. Tanaka, R. Fujii, K. Yumoto, and S. Ohtani, Self-consistent formulation for the evolution of ionospheric conductances at the ionospheric E-region within an M-I coupling scheme, J. Geophys. Res., 116, A09223, doi:10.1029/2011JA016449, 2011.
98. Yoshikawa A., O. Amm, H. Vanhamäki, and R. Fujii, A self-consistent synthesis description of M-I coupling and scale-dependent auroral process using shear Alfven wave, J. Geophys. Res., 116, A08218, doi:10.1029/2011JA016460, 2011.
99. Owen, C.J., Amm, O., Bruno, R., De Keyser, J., Dunlop, M., Eastwood, J., Fazakerley, A.N., Fontaine, D., Forsyth, C., Hasegawa, H., Hellinger, P., Hercik,  D., Jacquey, C., Milan, S., Raeder, J., Sibeck, D.G., Stverak, S., Travnicek, P., Walsh, A.P., and Wild, J., IMPALAS: Investigation of MagnetoPause Activity using Longitudinally-Aligned Satellites - a Mission Concept proposed for the ESA M3 2020/2022 Launch, Experimental Astronomy, doi:10.1007/s10686-011-9245-2, 2011.
100. Volwerk, M., J. Berchem, Y. V. Bogdanova, O. D. Constantinescu, M. W. Dunlop, J. P. Eastwood, P. Escoubet, A. N. Fazakerley, H. Frey, H. Hasegawa, B. Lavraud, E. V. Panov, C. Shen, J. K. Shi, M. G. G. T. Taylor, J. Wang, J. A. Wild, Q. H. Zhang, O. Amm, and J. M. Weygand, Interplanetary magnetic field rotations followed from L1 to the ground: The response of the Earth’s magnetosphere as seen by multi-spacecraft and ground-based observations, Ann. Geophys., 29, 1549-1569, 2011.
101. Vanhamäki, H., A. Viljanen, R. Pirjola, and O. Amm, Deriving the geomagnetically induced electric field at the Earth’s surface from the time derivative of the vertical magnetic field, Earth Planets Space, 2011 (submitted).
102. Weygand, J.M., O. Amm, V. Angelopoulos, S. Milan, A. Grocott, H. Gleisner, and C. Stolle, Comparison between SuperDARN flow vectors and equivalent ionospheric currents from ground magnetometer arrays, J. Geophys. Res., 2011 (submitted).
103. Yoshikawa, A., O. Amm, H. Vanhamäki, and R. Fujii, Theory for Cowling channel formation coupling to the field-aligned current system: Conjugate Hall current analysis, J. Geophys. Res., 2012 (submitted).