Substorm-Associated Ionospheric Flow Fluctuations During the 27 March 2017 Magnetic Storm: SuperDARN-Arase Conjunction

T. Hori, N. Nishitani, S. G. Shepherd, J. M. Ruohoniemi, M. Connors, M. Teramoto, S. Nakano, K. Seki, N. Takahashi, S. Kasahara, S. Yokota, T. Mitani, T. Takashima, N. Higashio, A. Matsuoka, K. Asamura, Y. Kazama, S. Y. Wang, Sunny Wing-Yee Tam, T. F. ChangB. J. Wang, Y. Miyoshi, I. Shinohara

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Super Dual Auroral Radar Network (SuperDARN) observations show that ionospheric flow fluctuations of millihertz or lower-frequency range with horizontal velocities of a few hundred meters per second appeared in the subauroral to midlatitude region during a magnetic storm on 27 March 2017. A set of the radars have provided the first ever observations that the fluctuations propagate azimuthally both westward and eastward simultaneously, showing bifurcated phase propagation associated with substorm expansion. Concurrent observations near the conjugate site in the inner magnetosphere made by the Arase satellite provide evidence that multiple drifting clouds of electrons in the near-Earth equatorial plane were associated with the electric field fluctuations propagating eastward in the ionosphere. We interpret this event in terms of mesoscale pressure gradients carried by drifting ring current electrons that distort field lines one after another as they drift through the inner magnetosphere, causing eastward propagating ionospheric electric field fluctuations.

Original languageEnglish
Pages (from-to)9441-9449
Number of pages9
JournalGeophysical Research Letters
Volume45
Issue number18
DOIs
Publication statusPublished - 2018 Sep 28

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radar networks
conjunction
magnetic storms
ionospherics
magnetosphere
electric field
radar
electron
current ring
pressure gradient
magnetospheres
ionosphere
ring currents
electric fields
temperate regions
pressure gradients
ionospheres
electrons
frequency ranges
low frequencies

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Hori, T., Nishitani, N., Shepherd, S. G., Ruohoniemi, J. M., Connors, M., Teramoto, M., ... Shinohara, I. (2018). Substorm-Associated Ionospheric Flow Fluctuations During the 27 March 2017 Magnetic Storm: SuperDARN-Arase Conjunction. Geophysical Research Letters, 45(18), 9441-9449. https://doi.org/10.1029/2018GL079777
Hori, T. ; Nishitani, N. ; Shepherd, S. G. ; Ruohoniemi, J. M. ; Connors, M. ; Teramoto, M. ; Nakano, S. ; Seki, K. ; Takahashi, N. ; Kasahara, S. ; Yokota, S. ; Mitani, T. ; Takashima, T. ; Higashio, N. ; Matsuoka, A. ; Asamura, K. ; Kazama, Y. ; Wang, S. Y. ; Tam, Sunny Wing-Yee ; Chang, T. F. ; Wang, B. J. ; Miyoshi, Y. ; Shinohara, I. / Substorm-Associated Ionospheric Flow Fluctuations During the 27 March 2017 Magnetic Storm : SuperDARN-Arase Conjunction. In: Geophysical Research Letters. 2018 ; Vol. 45, No. 18. pp. 9441-9449.
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abstract = "Super Dual Auroral Radar Network (SuperDARN) observations show that ionospheric flow fluctuations of millihertz or lower-frequency range with horizontal velocities of a few hundred meters per second appeared in the subauroral to midlatitude region during a magnetic storm on 27 March 2017. A set of the radars have provided the first ever observations that the fluctuations propagate azimuthally both westward and eastward simultaneously, showing bifurcated phase propagation associated with substorm expansion. Concurrent observations near the conjugate site in the inner magnetosphere made by the Arase satellite provide evidence that multiple drifting clouds of electrons in the near-Earth equatorial plane were associated with the electric field fluctuations propagating eastward in the ionosphere. We interpret this event in terms of mesoscale pressure gradients carried by drifting ring current electrons that distort field lines one after another as they drift through the inner magnetosphere, causing eastward propagating ionospheric electric field fluctuations.",
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Hori, T, Nishitani, N, Shepherd, SG, Ruohoniemi, JM, Connors, M, Teramoto, M, Nakano, S, Seki, K, Takahashi, N, Kasahara, S, Yokota, S, Mitani, T, Takashima, T, Higashio, N, Matsuoka, A, Asamura, K, Kazama, Y, Wang, SY, Tam, SW-Y, Chang, TF, Wang, BJ, Miyoshi, Y & Shinohara, I 2018, 'Substorm-Associated Ionospheric Flow Fluctuations During the 27 March 2017 Magnetic Storm: SuperDARN-Arase Conjunction', Geophysical Research Letters, vol. 45, no. 18, pp. 9441-9449. https://doi.org/10.1029/2018GL079777

Substorm-Associated Ionospheric Flow Fluctuations During the 27 March 2017 Magnetic Storm : SuperDARN-Arase Conjunction. / Hori, T.; Nishitani, N.; Shepherd, S. G.; Ruohoniemi, J. M.; Connors, M.; Teramoto, M.; Nakano, S.; Seki, K.; Takahashi, N.; Kasahara, S.; Yokota, S.; Mitani, T.; Takashima, T.; Higashio, N.; Matsuoka, A.; Asamura, K.; Kazama, Y.; Wang, S. Y.; Tam, Sunny Wing-Yee; Chang, T. F.; Wang, B. J.; Miyoshi, Y.; Shinohara, I.

In: Geophysical Research Letters, Vol. 45, No. 18, 28.09.2018, p. 9441-9449.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Substorm-Associated Ionospheric Flow Fluctuations During the 27 March 2017 Magnetic Storm

T2 - SuperDARN-Arase Conjunction

AU - Hori, T.

AU - Nishitani, N.

AU - Shepherd, S. G.

AU - Ruohoniemi, J. M.

AU - Connors, M.

AU - Teramoto, M.

AU - Nakano, S.

AU - Seki, K.

AU - Takahashi, N.

AU - Kasahara, S.

AU - Yokota, S.

AU - Mitani, T.

AU - Takashima, T.

AU - Higashio, N.

AU - Matsuoka, A.

AU - Asamura, K.

AU - Kazama, Y.

AU - Wang, S. Y.

AU - Tam, Sunny Wing-Yee

AU - Chang, T. F.

AU - Wang, B. J.

AU - Miyoshi, Y.

AU - Shinohara, I.

PY - 2018/9/28

Y1 - 2018/9/28

N2 - Super Dual Auroral Radar Network (SuperDARN) observations show that ionospheric flow fluctuations of millihertz or lower-frequency range with horizontal velocities of a few hundred meters per second appeared in the subauroral to midlatitude region during a magnetic storm on 27 March 2017. A set of the radars have provided the first ever observations that the fluctuations propagate azimuthally both westward and eastward simultaneously, showing bifurcated phase propagation associated with substorm expansion. Concurrent observations near the conjugate site in the inner magnetosphere made by the Arase satellite provide evidence that multiple drifting clouds of electrons in the near-Earth equatorial plane were associated with the electric field fluctuations propagating eastward in the ionosphere. We interpret this event in terms of mesoscale pressure gradients carried by drifting ring current electrons that distort field lines one after another as they drift through the inner magnetosphere, causing eastward propagating ionospheric electric field fluctuations.

AB - Super Dual Auroral Radar Network (SuperDARN) observations show that ionospheric flow fluctuations of millihertz or lower-frequency range with horizontal velocities of a few hundred meters per second appeared in the subauroral to midlatitude region during a magnetic storm on 27 March 2017. A set of the radars have provided the first ever observations that the fluctuations propagate azimuthally both westward and eastward simultaneously, showing bifurcated phase propagation associated with substorm expansion. Concurrent observations near the conjugate site in the inner magnetosphere made by the Arase satellite provide evidence that multiple drifting clouds of electrons in the near-Earth equatorial plane were associated with the electric field fluctuations propagating eastward in the ionosphere. We interpret this event in terms of mesoscale pressure gradients carried by drifting ring current electrons that distort field lines one after another as they drift through the inner magnetosphere, causing eastward propagating ionospheric electric field fluctuations.

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