Lion roars and nonoscillatory drift mirror waves in the magnetosheath

Tsurutani, B T; Smith, E J; Anderson, R R; Ogilvie, K W; Scudder, J D; Baker, D N; Bame, S J

doi:10.1029/JA087iA08p06060

Title: Lion roars and nonoscillatory drift mirror waves in the magnetosheath

Journal Article · Sun Aug 01 00:00:00 EDT 1982 · J. Geophys. Res.; (United States)

DOI:https://doi.org/10.1029/JA087iA08p06060· OSTI ID:6696628

Tsurutani, B T; Smith, E J; Anderson, R R; Ogilvie, K W; Scudder, J D; Baker, D N; Bame, S J

A complete set of ISEE plasma wave, plasma, and field data are used to identify the plasma instability responsible for the generation of extremely low frequency (ELF) electromagnetic lion roars. Lion roars detected close to the magnetopause are generated by the cyclotron instability of anisotropic (T/sup -//sub perpendicular//T/sup -//sub parallel/approx. =1.2) thermal electrons when the local plasma critical energy, E/sub M/ = B/sup 2//8..pi..N, falls to values (E/sub M/ approx.10--30 eV) close to or below the electron thermal energy, 25 eV, as a result of decreases in B. The lion roars are terminated by increases in the ambient magnetic field magnitude and consequential increases in E/sub M/ to values greater than 100 eV. Because there are few resonant particles at these high energies, the growth rate decreases by 3 orders of magnitude and measurable growth ceases. The value of the absolute upper limit of the frequency of unstable waves predicted by theory, ..omega../sub max/ = A/sup -/..cap omega../sup -//(A/sup -/+1), is compared with observations. The predictions and observations are found to be in general, but not exact, agreement. Several possible explanations are explored. The quasi-periodic, approx.20-s magnetic and plasma oscillations which cause the variations in E/sub M/ and hence alternately drive the cyclotron waves unstable and then stable are also investigated.

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Research Organization:: California Institute of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab. (JPL)

OSTI ID:: 6696628

Journal Information:: J. Geophys. Res.; (United States), Vol. 87:A8

Country of Publication:: United States

Language:: English

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Title: Lion roars and nonoscillatory drift mirror waves in the magnetosheath

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