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Multiradar observations of substorm-driven ULF waves

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journal contribution
posted on 2016-08-31, 15:03 authored by Matthew K. James, T. K. Yeoman, P. N. Mager, D. Yu Klimushkin
A recent statistical study of ULF waves driven by substorm-injected particles observed using Super Dual Auroral Radar Network (SuperDARN) found that the phase characteristics of these waves varied depending on where the wave was observed relative to the substorm. Typically, positive azimuthal wave numbers, m, were observed in waves generated to the east of the substorms and negative m to the west. The magnitude of m typically increased with the azimuthal separation between the wave observation and the substorm location. The energies estimated for the driving particles for these 83 wave events were found to be highest when the waves were observed closer to the substorm and lowest farther away. Each of the 83 events studied by James et al. (2013) involved just a single wave observation per substorm. Here a study of three individual substorm events are presented, with associated observations of multiple ULF waves using various different SuperDARN radars. We demonstrate that a single substorm is capable of driving a number of wave events characterized by different azimuthal scale lengths and wave periods, associated with different energies, W, in the driving particle population. We find that similar trends in m and W exist for multiple wave events with a single substorm as was seen in the single wave events of James et al. (2013). The variety of wave periods present on similar L shells in this study may also be evidence for the detection of both poloidal Alfvén and drift compressional mode waves driven by substorm-injected particles.

History

Citation

Journal of Geophysical Research: Space Physics, 2016, 121 (6), pp. 5213-5232

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

  • VoR (Version of Record)

Published in

Journal of Geophysical Research: Space Physics

Publisher

American Geophysical Union (AGU)

issn

2169-9402

Acceptance date

2016-05-11

Copyright date

2016

Available date

2016-08-31

Publisher version

http://onlinelibrary.wiley.com/doi/10.1002/2015JA022102/full

Language

en

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