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First observation of rising-tone magnetosonic waves
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
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2014 (English)In: Geophysical Research Letters, ISSN 0094-8276, Vol. 41, no 21, 7419-7426 p.Article in journal (Refereed) Published
Abstract [en]

Magnetosonic (MS) waves are linearly polarized emissions confined near the magnetic equator with wave normal angle near 90 degrees and frequency below the lower hybrid frequency. Such waves, also termed equatorial noise, were traditionally known to be "temporally continuous" in their time-frequency spectrogram. Here we show for the first time that MS waves actually have discrete wave elements with rising-tone features in their spectrogram. The frequency sweep rate of MS waves, similar to 1 Hz/s, is between that of chorus and electromagnetic ion cyclotron (EMIC) waves. For the two events we analyzed, MS waves occur outside the plasmapause and cannot penetrate into the plasmasphere; their power is smaller than that of chorus. We suggest that the rising-tone feature of MS waves is a consequence of nonlinear wave-particle interaction, as is the case with chorus and EMIC waves.

Place, publisher, year, edition, pages
2014. Vol. 41, no 21, 7419-7426 p.
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URN: urn:nbn:se:uu:diva-240101DOI: 10.1002/2014GL061867ISI: 000345518300002OAI: oai:DiVA.org:uu-240101DiVA: diva2:775924
Available from: 2015-01-05 Created: 2015-01-05 Last updated: 2015-01-05Bibliographically approved

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Khotyaintsev, Yuri V.Taubenschuss, Ulrich
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Swedish Institute of Space Physics, Uppsala Division
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