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Dayside Field‐Aligned Current Impacts on Ionospheric Irregularities
Author(s) -
Fæhn Follestad A.,
Herlingshaw K.,
Ghadjari H.,
Knudsen D. J.,
McWilliams K. A.,
Moen J. I.,
Spicher A.,
Wu J.,
Oksavik Kjellmar
Publication year - 2020
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2019gl086722
Subject(s) - ionosphere , gnss applications , context (archaeology) , earth's magnetic field , physics , satellite , geophysics , phase (matter) , spacecraft , electron precipitation , geodesy , magnetosphere , atmospheric sciences , plasma , geology , magnetic field , astronomy , paleontology , quantum mechanics
Global Navigation Satellite Systems (GNSS) are subject to disturbances caused by plasma irregularities in the ionosphere. Studies have suggested that in addition to the gradient drift and Kelvin‐Helmholtz instabilities, electron precipitation may be important for phase scintillations in the dayside auroral region. This study combines in situ Swarm data with ground GNSS observations to investigate the potential role of filamentary field‐aligned currents (FACs) on phase scintillations in the dayside auroral region by analyzing 22 events with phase scintillations exceeding 0.45 radians. We observe colocation between regions of severe phase scintillations and highly filamented FACs with fluctuations measured in the spacecraft frame of the order of 20 Hz. The observations indicate that filamentary FACs are crucial drivers for irregularities responsible for creating severe phase scintillations measured in the dayside auroral region and are thus of significant importance in the context of space weather impact on satellite communication.