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  1. No Access

    Article

    On the Usage of Geomagnetic Indices for Data Selection in Internal Field Modelling

    We present a review on geomagnetic indices describing global geomagnetic storm activity (Kp, am, Dst and dDst/dt) and on indices designed to characterize high latitude currents and substorms (PC and AE-indices an...

    K. Kauristie, A. Morschhauser, N. Olsen, C. C. Finlay… in Space Science Reviews (2017)

  2. No Access

    Article

    The dawn and dusk electrojet response to substorm onset

    We have investigated the time delay between substorm onset and related reactions in the dawn and dusk ionospheric electrojets, clearly separated from the nightside located substorm current wedge by several hou...

    E. Borälv, P. Eglitis, H. J. Opgenoorth, E. Donovan, G. Reeves… in Annales Geophysicae (2000)

  3. No Access

    Article

    Multi-instrument observations of the electric and magnetic field structure of omega bands

    High time resolution data from the CUTLASS Finland radar during the interval 01:30–03:30 UT on 11 May, 1998, are employed to characterise the ionospheric electric field due to a series of omega bands extending...

    J. A. Wild, T. K. Yeoman, P. Eglitis, H. J. Opgenoorth in Annales Geophysicae (1999)

  4. No Access

    Article

    Auroral precipitation fading before and at substorm onset: ionospheric and geostationary signatures

    Rapid fading of auroral activity a few minutes before substorm breakup has earlier been analyzed in case-studies. Here we report on a study in which all-sky camera (ASC) and magnetic data over 3 years were exa...

    K. Kauristie, T. I. Pulkkinen, A. Huuskonen, R. J. Pellinen… in Annales Geophysicae (1997)

  5. No Access

    Article

    What can we tell about global auroral-electrojet activity from a single meridional magnetometer chain?

    The AE indices are generally used for monitoring the level of magnetic activity in the auroral oval region. In some cases, however, the oval is either so expanded or contracted that the latitudinal coverage of th...

    K. Kauristie, T. I. Pulkkinen, R. J. Pellinen, H. J. Opgenoorth in Annales Geophysicae (1997)

  6. No Access

    Article

    OPPORTUNITIES FOR MAGNETOSPHERIC RESEARCH WITH COORDINATED CLUSTER AND GROUND-BASED OBSERVATIONS

    ESA's first multi-satellite mission Cluster is unique in its concept of 4 satellites orbiting in controlled formations. This will give an unprecedented opportunity to study structure and dynamics of the magnet...

    H. J. Opgenoorth, M. Lockwood in Space Science Reviews (1997)

  7. No Access

    Chapter

    Opportunities for Magnetospheric Research with Coordinated Cluster and Ground-Based Observations

    ESA’s first multi-satellite mission Cluster is unique in its concept of 4 satellites orbiting in controlled formations. This will give an unprecedented opportunity to study structure and dynamics of the magnet...

    H. J. Opgenoorth, M. Lockwood in The Cluster and Phoenix Missions (1997)