Lensing from small-scale travelling ionospheric disturbances observed using LOFAR

Ben Boyde, Alan Wood*, Gareth Dorrian, Richard A. Fallows, David Themens, Jens Mielich, Sean Elvidge, Maaijke Mevius, Pietro Zucca, Bartosz Dabrowski, Andrzej Krankowski, Christian Vocks, Mario M. Bisi

*Corresponding author for this work

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Abstract

Observations made using the LOw-Frequency ARray (LOFAR) between 10:15 and 11:48 UT on the 15th of September 2018 over a bandwidth of approximately 25–65 MHz contain discrete pseudo-periodic features of ionospheric origin. These features occur within a period of approximately 10 min and collectively last roughly an hour. They are strongly frequency dependent, broadening significantly in time towards the lower frequencies, and show an overlaid pattern of diffraction fringes. By modelling the ionosphere as a thin phase screen containing a wave-like disturbance, we are able to replicate the observations, suggesting that they are associated with small-scale travelling ionospheric disturbances (TIDs). This modelling indicates that the features observed here require a compact radio source at a low elevation and that the TID or TIDs in question have a wavelength
Original languageEnglish
Article number34
Number of pages13
JournalJournal of Space Weather and Space Climate
Volume12
DOIs
Publication statusPublished - 12 Oct 2022

Keywords

  • Small-scale travelling ionospheric disturbance
  • phase screen
  • ionospheric physics

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