Improved Geomagnetic Referencing in the Arctic Environment (Russian)

Poedjono, Benny; Beck, Nathan; Buchanan, Andrew; Borri, Luca; Maus, Stefan; Finn, C.; Worthington, E. William; White, T.

doi:10.2118/166850-ru

Cited by 8 publications

(1 citation statement)

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“…For example, ground‐based systems may be subject to peaky induced geoelectric fields and associated currents (Boteler & Pirjola, 2017; Boteler et al., 1998). On the other hand, geomagnetic field disturbances caused by strong ionospheric currents may affect the positioning and navigation systems (Poedjono et al., 2013). The intensification of plasma streams may also contribute to increase the atmospheric drag acting on low‐Earth‐orbit satellites, thus resulting in the lowering of the flight altitude (Liu & Lühr, 2005; Pirjola et al., 2005).…”

Section: Introductionmentioning

confidence: 99%

Parallel Electrical Conductivity in the Topside Ionosphere Derived From Swarm Measurements

et al. 2021

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Our knowledge of the physical properties of the topside ionosphere is still incomplete. A key point still not fully understood is how field‐aligned currents are generated, evolve and dissipate in the ionosphere. Answering to this question is fundamental for a better understanding of the mechanisms regulating the coupling between magnetosphere and ionosphere and to shed light on the physical processes inherent to space weather events occurring in the Earth's ionosphere. In this framework a relevant role is played by the ionospheric conductivity. The purpose of this study is to analyze the main properties of the electrical conductivity parallel to the geomagnetic field from a climatological point of view. The statistical study of the electrical conductivity is proposed using four years of in‐situ electron density and temperature measurements at 1 Hz acquired by the European Space Agency's Swarm A satellite. Variations due to seasonal effects are also investigated. Finally, starting from observations and comparing our results with those obtained using International Reference Ionosphere model, we give a first estimation of the conductivity mainly due to particle precipitation.

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Section: Introductionmentioning

confidence: 99%

Parallel Electrical Conductivity in the Topside Ionosphere Derived From Swarm Measurements

et al. 2021

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Determining polar ionospheric electrojet currents from Swarm satellite constellation magnetic data

2016

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We determine the strength and location of the ionospheric currents responsible for the polar electrojets from magnetic data collected by the Swarm satellite constellation on an orbit-by-orbit basis. The ionospheric currents are modelled using a simple, yet robust, method by a series of line currents at 110 km altitude (corresponding to the ionospheric E-layer) perpendicular to the satellite orbit, separated by 1 • (about 113 km). We assess the reliability of our method, with the aim of a possible near-real-time application. A study of the effect of different regularization methods is therefore carried out. An L 1 model regularization of the second-order spatial differences, and robust treatment of the data (to account for non-Gaussian error distributions), yields the most encouraging results. We apply our approach to two three-weekly data periods in March 2014 (geomagnetic quiet conditions) and March 2015 (more disturbed conditions), respectively. Our orbit-by-orbit approach also allows the temporal evolution of the polar electrojets to be investigated. We find remarkable agreement of the ionospheric activity in Northern and Southern polar regions, with correlation exceeding 0.9 for periods longer than two days. Reliability of the approach is shown by three key results: (1) a common regularization parameter for all orbits with enough data coverage, (2) 0.95 squared coherence with the Auroral Electrojet index, and (3) 0.97 squared coherence is found between the side-by-side flying satellites, Alpha and Charlie, indicating a method invariant to small changes in data input. All these results indicate a possible automated near-real-time application.

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Some Challenges of Geomagnetism Addressed with the Use of Ground and Satellite Observations

Soloviev

2023

Russian Geology and Geophysics

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—Continuous growth of geomagnetic observations requires adequate methods for their processing and analysis. However, many studies in the field of geomagnetism require accurate and reliable measurements performed on the ground and in outer space. Mathematical methods of geoinformatics can provide a solution to these problems. The article describes the progress made in the field of intellectual analysis of geomagnetic data continuously recorded by magnetic observatories and low-orbit satellites, demonstrates the results in the study of rapid variations of the Earth’s core magnetic field associated with the deep processes of the Earth, and presents the investigation of near-Earth electromagnetic dynamics. The applied value of the obtained results is shown.

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Improved Geomagnetic Referencing in the Arctic Environment (Russian)

Cited by 8 publications

References 0 publications

Parallel Electrical Conductivity in the Topside Ionosphere Derived From Swarm Measurements

Parallel Electrical Conductivity in the Topside Ionosphere Derived From Swarm Measurements

Determining polar ionospheric electrojet currents from Swarm satellite constellation magnetic data

Some Challenges of Geomagnetism Addressed with the Use of Ground and Satellite Observations

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