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LOFAR Observations of Substructure Within a Traveling Ionospheric Disturbance at Mid‐Latitude

Space Weather American Geophysical Union (AGU) 21:1 (2023) e2022SW003198

Authors:

Gareth Dorrian, Richard Fallows, Alan Wood, David R Themens, Ben Boyde, Andrzej Krankowski, Mario Bisi, Bartosz Dąbrowski, Christian Vocks

Abstract:

AbstractThe large scale morphology and finer sub‐structure within a slowly propagating traveling ionospheric disturbance (TID) are studied using wide band trans‐ionospheric radio observations with the LOw Frequency ARray (LOFAR; van Haarlem et al., 2013, https://doi.org/10.1051/0004-6361/201220873). The observations were made under geomagnetically quiet conditions, between 0400 and 0800 on 7 January 2019, over the UK. In combination with ionograms and Global Navigation Satellite System Total Electron Content anomaly data we estimate the TID velocity to ∼60 ms−1, in a North‐westerly direction. Clearly defined substructures with oscillation periods of ∼300 s were identified within the TID, corresponding to scale sizes of 20 km. At the geometries and observing wavelengths involved, the Fresnel scale is between 3 and 4 km, hence these substructures contribute significant refractive scattering to the received LOFAR signal. The refractive scattering is strongly coherent across the LOFAR bandwidth used here (25–64 MHz). The size of these structures distinguishes them from previously identified ionospheric scintillation with LOFAR in Fallows et al. (2020), https://doi.org/10.1051/swsc/2020010, where the scale sizes of the plasma structure varied from ∼500 m to 5 km.
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Generic Axion Maxwell Equations: Path Integral Approach

Annalen Phys. 536 (2023) 1, 2300112

Authors:

Anton V. Sokolov, Andreas Ringwald

Abstract:

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Searching for GUT-scale QCD axions and monopoles with a high-voltage capacitor

Phys.Rev.D 108 (2023) 3, 035024

Authors:

Michael E. Tobar, Anton V. Sokolov, Andreas Ringwald, Maxim Goryachev

Abstract:

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A New Task: Deriving Semantic Class Targets for the Physical Sciences

ArXiv 2210.1476 (2022)

Authors:

Micah Bowles, Hongming Tang, Eleni Vardoulaki, Emma L Alexander, Yan Luo, Lawrence Rudnick, Mike Walmsley, Fiona Porter, Anna MM Scaife, Inigo Val Slijepcevic, Gary Segal
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Search and identification of transient and variable radio sources using MeerKAT observations: a case study on the MAXI J1820+070 field

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 517:2 (2022) 2894-2911

Authors:

A Rowlinson, J Meijn, J Bright, AJ van der Horst, S Chastain, S Fijma, R Fender, I Heywood, RAMJ Wijers, PA Woudt, A Andersson, GR Sivakoff, E Tremou, LN Driessen
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