TitleA Review of Alfvénic Turbulence in High-Speed Solar Wind Streams: Hints From Cometary Plasma Turbulence
Publication TypeJournal Article
Year of Publication2018
AuthorsTsurutani, BT, Lakhina, GS, Sen, A, Hellinger, P, Glassmeier, K-H, Mannucci, AJ
JournalJournal of Geophysical Research: Space Physics
Volume12377466211188104577680416110767682862528757892365153778347146307616264152061
Issue446A8A12216121922A813731L81204210-11421161-2121262611-12151-
Pagination2458 - 2492
Date PublishedJan-04-2018
KeywordsAlfvén waves; discontinuities; interplanetary turbulence; magnetic decreases; parker solar probe; period doubling; Solar Probe Plus; wave phase-steepening
Abstract

Solar wind turbulence within high-speed streams is reviewed from the point of view of embedded single nonlinear Alfvén wave cycles, discontinuities, magnetic decreases (MDs), and shocks. For comparison and guidance, cometary plasma turbulence is also briefly reviewed. It is demonstrated that cometary nonlinear magnetosonic waves phase-steepen, with a right-hand circular polarized foreshortened front and an elongated, compressive trailing edge. The former part is a form of "wave breaking" and the latter that of "period doubling." Interplanetary nonlinear Alfvén waves, which are arc polarized, have a 180° foreshortened front and with an elongated trailing edge. Alfvén waves have polarizations different from those of cometary magnetosonic waves, indicating that helicity is a durable feature of plasma turbulence. Interplanetary Alfvén waves are noted to be spherical waves, suggesting the possibility of additional local generation. They kinetically dissipate, forming MDs, indicating that the solar wind is partially "compressive" and static. The 2 MeV protons can nonresonantly interact with MDs leading to rapid cross-field ( 5.5% Bohm) diffusion. The possibility of local ( 1 AU) generation of Alfvén waves may make it difficult to forecast High-Intensity, Long-Duration AE Activity and relativistic magnetospheric electrons with great accuracy. The future Solar Orbiter and Solar Probe Plus missions should be able to not only test these ideas but to also extend our knowledge of plasma turbulence evolution

URLhttp://doi.wiley.com/10.1002/jgra.v123.4http://doi.wiley.com/10.1002/2017JA024203https://onlinelibrary.wiley.com/doi/full/10.1002/2017JA024203https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2F2017JA024203
DOI10.1002/jgra.v123.410.1002/2017JA024203
Short TitleJ. Geophys. Res. Space Physics


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