Search Results - "Gjerloev, J."

The SuperMAG data processing technique by Gjerloev, J. W.

“…In this paper I outline the data processing technique which is used in the SuperMAG initiative. SuperMAG is a worldwide collaboration of organizations and…”
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Evaluation of SuperMAG auroral electrojet indices as indicators of substorms and auroral power by Newell, P. T., Gjerloev, J. W.

“…We use magnetometer chains collaborating with SuperMAG to derive SME, a generalization of the auroral electrojet indices calculated from 100 or more sites…”
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Substorm and magnetosphere characteristic scales inferred from the SuperMAG auroral electrojet indices by Newell, P. T., Gjerloev, J. W.

“…A generalization of the traditional 12‐station auroral electrojet (AE) index to include more than 100 magnetometer stations, SME, is an excellent predictor of…”
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AE, DST, and Their SuperMAG Counterparts: The Effect of Improved Spatial Resolution in Geomagnetic Indices by Bergin, A., Chapman, S. C., Gjerloev, J. W.

“…For decades, geomagnetic indices have been used extensively to parameterize space weather events, as input to various models and as space weather…”
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SuperMAG-based partial ring current indices by Newell, P. T., Gjerloev, J. W.

“…Using the extensive set of stations in the SuperMAG collaboration, we introduce partial ring current indices, which provide new insights into ring current…”
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Magnetotail Variability During Magnetospheric Substorms by Kumar, S., Pulkkinen, T. I., Gjerloev, J.

“…In this work, we present a statistical study of substorms covering a five‐year period 2016–2020. Substorm phases were identified from time series of the…”
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A new technique for determining Substorm Onsets and Phases from Indices of the Electrojet (SOPHIE) by Forsyth, C., Rae, I. J., Coxon, J. C., Freeman, M. P., Jackman, C. M., Gjerloev, J., Fazakerley, A. N.

“…We present a new quantitative technique that determines the times and durations of substorm expansion and recovery phases and possible growth phases based on…”
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Extremely intense (SML ≤–2500 nT) substorms: isolated events that are externally triggered? by Tsurutani, B T, Hajra, R, Echer, E, Gjerloev, J W

“…We examine particularly intense substorms (SML –2500 nT), hereafter called "supersubstorms" or SSS events, to identify their nature and their magnetic storm…”
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Solar Cycle and Solar Wind Dependence of the Occurrence of Large dB/dt Events at High Latitudes by Milan, S. E., Imber, S. M., Fleetham, A. L., Gjerloev, J.

“…We investigate sharp changes in magnetic field that can produce Geomagnetically Induced Currents (GICs) which damage pipelines and power grids. We use…”
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The large-scale current system during auroral substorms by Gjerloev, J. W., Hoffman, R. A.

“…We present an empirical model of the equivalent current system in the ionosphere during the peak of a classical bulge-type auroral sub storm. This model is…”
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External and Internal Causes of the Stormtime Intensification of the Dawnside Westward Auroral Electrojet by Ohtani, S., Sorathia, K., Merkin, V. G., Frey, H. U., Gjerloev, J. W.

“…The dawn‐dusk asymmetry of magnetic depression is a characteristic feature of the storm main phase. Recently Ohtani (2021,…”
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Network community structure of substorms using SuperMAG magnetometers by Orr, L., Chapman, S. C., Gjerloev, J. W., Guo, W.

“…Geomagnetic substorms are a global magnetospheric reconfiguration, during which energy is abruptly transported to the ionosphere. Central to this are the…”
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Directed Network of Substorms Using SuperMAG Ground‐Based Magnetometer Data by Orr, L., Chapman, S. C., Gjerloev, J. W.

“…We quantify the spatiotemporal evolution of the substorm ionospheric current system utilizing the SuperMAG 100+ magnetometers. We construct dynamical directed…”
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Height‐Integrated Ionospheric Conductances Parameterized By Interplanetary Magnetic Field and Substorm Phase by Carter, J. A., Milan, S. E., Paxton, L. J., Anderson, B. J., Gjerloev, J.

“…An understanding of ionospheric conductances is important for models of large‐scale dynamics in the Earth's magnetosphere. We parameterize height‐integrated…”
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Global Dynamical Network of the Spatially Correlated Pc2 Wave Response for the 2015 St. Patrick's Day Storm by Chaudhry, S., Chapman, S. C., Gjerloev, J., Beggan, C. D.

“…We show the global dynamics of spatial correlation of Pc2 wave activity can track the evolution of the 2015 St. Patrick's Day geomagnetic storm for an 8 hr…”
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Deriving Global Convection Maps From SuperDARN Measurements by Gjerloev, J. W., Waters, C. L., Barnes, R. J.

“…A new statistical modeling technique for determining the global ionospheric convection is described. The principal component regression (PCR)‐based technique…”
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The Relationship Between Large dB/dt and Field‐Aligned Currents During Five Geomagnetic Storms by Fleetham, A. L., Milan, S. E., Imber, S. M., Bower, G. E., Gjerloev, J., Vines, S. K.

“…During periods of increased geomagnetic activity, perturbations within the terrestrial magnetosphere are known to induce currents within conducting materials,…”
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On the relation between asymmetries in the ring current and magnetopause current by Haaland, S., Gjerloev, J.

“…Motion of charged particles in the Earth's magnetosphere sets up a system of currents. Current continuity requires that these currents are closed, either…”
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Solar Wind‐Magnetosphere Coupling During High‐Intensity Long‐Duration Continuous AE Activity (HILDCAA) by Milan, S. E., Mooney, M. K., Bower, G., Fleetham, A. L., Vines, S. K., Gjerloev, J.

“…High‐Intensity Long‐Duration Continuous AE Activity (HILDCAA) intervals are driven by High Speed solar wind Streams (HSSs) during which the rapidly‐varying…”
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Tracking the Subsolar Bow Shock and Magnetopause: Applying the Magnetosheath Velocity Gradient Method by Silveira, M. V. D., Sibeck, D. G., Cardoso, F. R., Gjerloev, J. W.

“…Both the bow shock and magnetopause move in response to varying solar wind and magnetospheric conditions. Tracking their locations can provide important clues…”
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