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  A LOFAR observation of ionospheric scintillation from two simultaneous travelling ionospheric disturbances

Fallows, R. A., Forte, B., Astin, I., Allbrook, T., Arnold, A., Wood, A., et al. (2020). A LOFAR observation of ionospheric scintillation from two simultaneous travelling ionospheric disturbances. Journal of Space Weather and Space Climate, 10: 10. doi:10.1051/swsc/2020010.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-7A04-D Version Permalink: http://hdl.handle.net/21.11116/0000-0006-7A05-C
Genre: Journal Article

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Fallows, Richard A., Author
Forte, Biagio, Author
Astin, Ivan, Author
Allbrook, Tom, Author
Arnold, Alex, Author
Wood, Alan, Author
Dorrian, Gareth, Author
Mevius, Maaijke, Author
Rothkaehl, Hanna, Author
Matyjasiak, Barbara, Author
Krankowski, Andrzej, Author
Anderson, James M., Author
Asgekar, Ashish, Author
Avruch, I. Max, Author
Bentum, Mark, Author
Bisi, Mario M., Author
Butcher, Harvey R., Author
Ciardi, Benedetta1, Author              
Dabrowski, Bartosz, Author
Damstra, Sieds, Author
de Gasperin, Francesco, AuthorDuscha, Sven, AuthorEislöffel, Jochen, AuthorFranzen, Thomas M.O., AuthorGarrett, Michael A., AuthorGrießmeier, Jean-Matthias, AuthorGunst, André W., AuthorHoeft, Matthias, AuthorHörandel, Jörg R., AuthorIacobelli, Marco, AuthorIntema, Huib T., AuthorKoopmans, Leon V.E., AuthorMaat, Peter, AuthorMann, Gottfried, AuthorNelles, Anna, AuthorPaas, Harm, AuthorPandey, Vishambhar N., AuthorReich, Wolfgang, AuthorRowlinson, Antonia, AuthorRuiter, Mark, AuthorSchwarz, Dominik J., AuthorSerylak, Maciej, AuthorShulevski, Aleksander, AuthorSmirnov, Oleg M., AuthorSoida, Marian, AuthorSteinmetz, Matthias, AuthorThoudam, Satyendra, AuthorToribio, M. Carmen, Authorvan Ardenne, Arnold, Authorvan Bemmel, Ilse M., Authorvan der Wiel, Matthijs H.D., Authorvan Haarlem, Michiel P., AuthorVermeulen, René C., AuthorVocks, Christian, AuthorWijers, Ralph A.M.J., AuthorWucknitz, Olaf, AuthorZarka, Philippe, AuthorZucca, Pietro, Author more..
Affiliations:
1Computational Structure Formation, MPI for Astrophysics, Max Planck Society, ou_2205642              

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 Abstract: This paper presents the results from one of the first observations of ionospheric scintillation taken using the Low-Frequency Array (LOFAR). The observation was of the strong natural radio source Cassiopeia A, taken overnight on 18–19 August 2013, and exhibited moderately strong scattering effects in dynamic spectra of intensity received across an observing bandwidth of 10–80 MHz. Delay-Doppler spectra (the 2-D FFT of the dynamic spectrum) from the first hour of observation showed two discrete parabolic arcs, one with a steep curvature and the other shallow, which can be used to provide estimates of the distance to, and velocity of, the scattering plasma. A cross-correlation analysis of data received by the dense array of stations in the LOFAR “core” reveals two different velocities in the scintillation pattern: a primary velocity of ~20–40 ms−1 with a north-west to south-east direction, associated with the steep parabolic arc and a scattering altitude in the F-region or higher, and a secondary velocity of ~110 ms−1 with a north-east to south-west direction, associated with the shallow arc and a scattering altitude in the D-region. Geomagnetic activity was low in the mid-latitudes at the time, but a weak sub-storm at high latitudes reached its peak at the start of the observation. An analysis of Global Navigation Satellite Systems (GNSS) and ionosonde data from the time reveals a larger-scale travelling ionospheric disturbance (TID), possibly the result of the high-latitude activity, travelling in the north-west to south-east direction, and, simultaneously, a smaller-scale TID travelling in a north-east to south-west direction, which could be associated with atmospheric gravity wave activity. The LOFAR observation shows scattering from both TIDs, at different altitudes and propagating in different directions. To the best of our knowledge this is the first time that such a phenomenon has been reported.

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Language(s): eng - English
 Dates: 2020-03-20
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1051/swsc/2020010
Other: LOCALID: 3235737
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Title: Journal of Space Weather and Space Climate
Source Genre: Journal
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Publ. Info: France : EDP Sciences
Pages: - Volume / Issue: 10 Sequence Number: 10 Start / End Page: - Identifier: ISSN: 2115-7251
CoNE: https://pure.mpg.de/cone/journals/resource/2115-7251