Blar i Bergen Open Research Archive på forfatter "Gjerløv, Jesper"
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Solar Cycle and Solar Wind Dependence of the Occurrence of Large dB/dt Events at High Latitudes
Milan, Stephen Eric; Imber, S.M.; Fleetham, A.L.; Gjerløv, Jesper (Journal article; Peer reviewed, 2023)We investigate sharp changes in magnetic field that can produce Geomagnetically Induced Currents (GICs) which damage pipelines and power grids. We use one-minute cadence SuperMAG observations to find the occurrence ... -
Solar illumination dependence of the auroral electrojet intensity: Interplay between the solar zenith angle and dipole tilt
Ohtani, Shinici; Gjerløv, Jesper; Johnsen, Magnar Gullikstad; Yamauchi, Masatoshi; Brändström, Urban; Lewis, Andrew M. (Peer reviewed; Journal article, 2019-08)The present study investigates the dependence of the local auroral electrojet (AEJ) intensity on solar illumination by statistically examining northward geomagnetic disturbances in the auroral zone in terms of the solar ... -
Spatial Variation in the Responses of the Surface External and Induced Magnetic Field to the Solar Wind
Shore, R.M; Freeman, MP; Coxon, John C.; Thomas, EG; Gjerløv, Jesper; Olsen, N. (Peer reviewed; Journal article, 2019-07-05)We analyze the spatial variation in the response of the surface geomagnetic field (or the equivalent ionospheric current) to variations in the solar wind. Specifically, we regress a reanalysis of surface external and induced ... -
Temporal characteristics and energy deposition of pulsating auroral patches
Humberset, Beate Krøvel; Gjerløv, Jesper; Samara, Marilla; Michell, Robert; Mann, Ian R. (Peer reviewed; Journal article, 2016-07-23)We present a careful statistical analysis of pulsating aurora (PA) using all-sky green line (557.7 nm) images obtained at 3.3 Hz. Six well-defined individual PA patches are identified and extracted using a contouring ... -
Toward a Next Generation Particle Precipitation Model: Mesoscale Prediction Through Machine Learning (a Case Study and Framework for Progress)
McGranaghan, Ryan M.; Ziegler, Jack; Bloch, Téo; Hatch, Spencer Mark; Camporeale, Enrico; Lynch, Kristina; Owens, Mathew; Gjerløv, Jesper; Zhang, Binzheng; Skone, Susan (Journal article; Peer reviewed, 2021)We advance the modeling capability of electron particle precipitation from the magnetosphere to the ionosphere through a new database and use of machine learning (ML) tools to gain utility from those data. We have compiled, ... -
What is the appropriate coordinate system for magnetometer data when analyzing ionospheric currents?
Laundal, Karl Magnus; Gjerløv, Jesper (Peer reviewed; Journal article, 2014-10)In this paper we investigate which coordinate representation is most appropriate when analyzing ground magnetometer data in terms of ionospheric currents, in particular the westward electrojet. The AL and the recently ...