Method of characteristics in spherical geometry applied to a Harang-discontinuity situation

by O. Amm
Published 1998-04-01

A new method to estimate ionospheric electric fields and currents using data from a local ground magnetometer network

by H. Vanhamäki, O. Amm
Published 2007-06-01

Induction effects on ionospheric electric and magnetic fields

by H. Vanhamäki, A. Viljanen, O. Amm
Published 2005-07-01

Spatial distribution of conductances and currents associated with a north-south auroral form during a multiple-substorm period

by O. Amm, A. Pajunpää, U. Brandström
Published 1999-11-01

New method for solving inductive electric fields in the non-uniformly conducting ionosphere

by H. Vanhamäki, O. Amm, A. Viljanen
Published 2006-10-01

Role of inductive electric fields and currents in dynamical ionospheric situations

by H. Vanhamäki, O. Amm, A. Viljanen
Published 2007-03-01

Analysis of ionospheric electrodynamic parameters on mesoscales – a review of selected techniques using data from ground-based observation networks and satellites

by H. Vanhamäki, H. Vanhamäki, O. Amm
Published 2011-03-01

Corrigendum to "Reconnection electric field estimates and dynamics of high-latitude boundaries during a substorm" published in Ann. Geophys., 27, 2157–2171, 2009

by T. Pitkänen, A. T. Aikio, A. Kozlovsky, O. Amm
Published 2009-08-01

Reconnection electric field estimates and dynamics of high-latitude boundaries during a substorm

by T. Pitkänen, A. T. Aikio, A. Kozlovsky, O. Amm
Published 2009-05-01

Statistical dependence of auroral ionospheric currents on solar wind and geomagnetic parameters from 5 years of CHAMP satellite data

by L. Juusola, K. Kauristie, O. Amm, P. Ritter
Published 2009-03-01

Characteristics of a stable arc based on FAST and MIRACLE observations

by P. Janhunen, A. Olsson, O. Amm, K. Kauristie
Published 2000-02-01

A model for estimating the relation between the Hall to Pedersen conductance ratio and ground magnetic data derived from CHAMP satellite statistics

by L. Juusola, O. Amm, K. Kauristie, A. Viljanen
Published 2007-03-01

Method to locate the polar cap boundary in the nightside ionosphere and application to a substorm event

by A. T. Aikio, T. Pitkänen, A. Kozlovsky, A. Kozlovsky, O. Amm
Published 2006-08-01

Electrodynamics of an omega-band as deduced from optical and magnetometer data

by H. Vanhamäki, K. Kauristie, O. Amm, A. Senior, D. Lummerzheim, S. Milan
Published 2009-09-01

IMF effect on the polar cap contraction and expansion during a period of substorms

by A. T. Aikio, T. Pitkänen, I. Honkonen, I. Honkonen, M. Palmroth, O. Amm
Published 2013-06-01

EISCAT-Cluster observations of quiet-time near-Earth magnetotail fast flows and their signatures in the ionosphere

by T. Pitkänen, A. T. Aikio, O. Amm, K. Kauristie, H. Nilsson, K. U. Kaila
Published 2011-02-01

Ionospheric currents estimated simultaneously from CHAMP satelliteand IMAGE ground-based magnetic field measurements: a statisticalstudy at auroral latitudes

by P. Ritter, H. Lühr, A. Viljanen, O. Amm, A. Pulkkinen, I. Sillanpää
Published 2004-01-01

Fast computation of the geoelectric field using the method of elementary current systems and planar Earth models

by A. Viljanen, A. Pulkkinen, O. Amm, R. Pirjola, T. Korja, T. Korja, BEAR Working Group
Published 2004-01-01

Quantitative modelling of the closure of meso-scale parallel currents in the nightside ionosphere

by A. Marchaudon, J.-C. Cerisier, O. Amm, M. Lester, C. W. Carlson, G. K. Parks
Published 2004-01-01

Substorm topology in the ionosphere and magnetosphere during a flux rope event in the magnetotail

by O. Amm, R. Nakamura, H. U. Frey, Y. Ogawa, M. Kubyshkina, A. Balogh, H. Rème
Published 2006-03-01