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High-Frequency Wave...
High-Frequency Wave Generation in Magnetotail Reconnection : Linear Dispersion Analysis
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- Burch, J. L. (author)
- Southwest Res Inst, San Antonio, TX 78238 USA
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- Dokgo, K. (author)
- Southwest Res Inst, San Antonio, TX 78238 USA
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- Hwang, K. J. (author)
- Southwest Res Inst, San Antonio, TX 78238 USA
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- Torbert, R. B. (author)
- Southwest Res Inst, San Antonio, TX 78238 USA;Univ New Hampshire, Dept Phys, Durham, NH 03824 USA
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- Graham, Daniel B. (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Webster, J. M. (author)
- Rice Univ, Dept Phys & Astron, Houston, TX USA
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- Ergun, R. E. (author)
- Univ Colorado, LASP, Boulder, CO 80309 USA
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- Giles, B. L. (author)
- NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
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- Allen, R. C. (author)
- Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA
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- Chen, L-J (author)
- NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
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- Wang, S. (author)
- Univ Maryland, Dept Astron, College Pk, MD 20742 USA
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- Genestreti, K. J. (author)
- Univ New Hampshire, Dept Phys, Durham, NH 03824 USA
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- Russell, C. T. (author)
- Univ Calif Los Angeles, Earth & Planetary Sci, Los Angeles, CA USA
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- Strangeway, R. J. (author)
- Univ Calif Los Angeles, Earth & Planetary Sci, Los Angeles, CA USA
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- Le Contel, O. (author)
- Univ Paris Sud, Observ Paris, Sorbonne Univ, Lab Phys Plasmas,CNRS,Ecole Polytech, Paris, France
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(creator_code:org_t)
- AMER GEOPHYSICAL UNION, 2019
- 2019
- English.
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In: Geophysical Research Letters. - : AMER GEOPHYSICAL UNION. - 0094-8276 .- 1944-8007. ; 46:8, s. 4089-4097
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Abstract
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- Plasma and wave measurements from the NASA Magnetospheric Multiscale mission are presented for magnetotail reconnection events on 3 July and 11 July 2017. Linear dispersion analyses were performed using distribution functions comprising up to six drifting bi-Maxwellian distributions. In both events electron crescent-shaped distributions are shown to be responsible for upper hybrid waves near the X-line. In an adjacent location within the 3 July event a monodirectional field-aligned electron beam drove parallel-propagating beam-mode waves. In the 11 July event an electron distribution consisting of a drifting core and two crescents was shown to generate upper-hybrid and beam-mode waves at three different frequencies, explaining the observed broadband waves. Multiple harmonics of the upper hybrid waves were observed but cannot be explained by the linear dispersion analysis since they result from nonlinear beam interactions. Plain Language Summary Magnetic reconnection is a process that occurs throughout the universe in ionized gases (plasmas) containing embedded magnetic fields. This process converts magnetic energy to electron and ion energy, causing phenomena such as solar flares and auroras. The NASA Magnetospheric Multiscale mission has shown that in magnetic reconnection regions there are intense electric field oscillations or waves and that electrons form crescent and beam-like populations propagating both along and perpendicular to the magnetic field. This study shows that the observed electron populations are responsible for high-frequency waves including their propagation directions and frequency ranges.
Subject headings
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Burch, J. L.
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Dokgo, K.
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Hwang, K. J.
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Torbert, R. B.
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Graham, Daniel B ...
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Webster, J. M.
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show more...
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Ergun, R. E.
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Giles, B. L.
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Allen, R. C.
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Chen, L-J
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Wang, S.
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Genestreti, K. J ...
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Russell, C. T.
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Strangeway, R. J ...
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Le Contel, O.
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Fusion Plasma an ...
- Articles in the publication
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Geophysical Rese ...
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Uppsala University