Wave-particle energy exchange directly observed in a kinetic Alfvén-branch wave
- Univ. of Maryland, College Park, MD (United States); Department of Astronomy, University of Maryland, College Park, Maryland 20742, USA
- NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
- NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Univ. of Maryland, Baltimore County, MD (United States)
- Univ. of Maryland, College Park, MD (United States); NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
- California Inst. of Technology (CalTech), Pasadena, CA (United States)
- Imperial College, London (United Kingdom)
- Univ. de Toulouse, Toulouse (France); Centre National de la Recherche Scientifique, Toulouse (France)
- NASA Marshall Space Flight Center, Huntsville, AL (United States)
- JAXA Institute of Space and Astronautical Science, Kanagawa (Japan)
- Southwest Research Institute, San Antonio, TX (United States)
- Univ. of Colorado, Boulder, CO (United States)
- Univ. of California, Los Angeles, CA (United States)
- Univ. of New Hampshire, Durham, NH (United States); Southwest Research Institute Durham, Durham, NH (United States)
Alfvén waves are fundamental plasma wave modes that permeate the universe. At small kinetic scales, they provide a critical mechanism for the transfer of energy between electromagnetic fields and charged particles. These waves are important not only in planetary magnetospheres, heliospheres and astrophysical systems but also in laboratory plasma experiments and fusion reactors. Through measurement of charged particles and electromagnetic fields with NASA’s Magnetospheric Multiscale (MMS) mission, we utilize Earth’s magnetosphere as a plasma physics laboratory. Here we confirm the conservative energy exchange between the electromagnetic field fluctuations and the charged particles that comprise an undamped kinetic Alfvén wave. Electrons confined between adjacent wave peaks may have contributed to saturation of damping effects via nonlinear particle trapping. As a result, the investigation of these detailed wave dynamics has been unexplored territory in experimental plasma physics and is only recently enabled by high-resolution MMS observations.
- Research Organization:
- California Inst. of Technology (CalTech), Pasadena, CA (United States); Univ. of Maryland, College Park, MD (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- FG02-04ER54755
- OSTI ID:
- 1361175
- Alternate ID(s):
- OSTI ID: 1574932
- Journal Information:
- Nature Communications, Journal Name: Nature Communications Vol. 8; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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