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Parallel Electrical Conductivity in the Topside Ionosphere Derived From Swarm Measurements
Author(s) -
Giannattasio F.,
De Michelis P.,
Pignalberi A.,
Coco I.,
Consolini G.,
Pezzopane M.,
Tozzi R.
Publication year - 2021
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1029/2020ja028452
Subject(s) - ionosphere , earth's magnetic field , geophysics , space weather , magnetosphere , electrical resistivity and conductivity , field (mathematics) , satellite , computational physics , physics , atmospheric sciences , magnetic field , mathematics , quantum mechanics , pure mathematics , astronomy
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.