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Nonlinear two‐stream instabilities as an explanation for auroral bipolar wave structures
Author(s) -
Goldman M. V.,
Oppenheim M. M.,
Newman D. L.
Publication year - 1999
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl900435
Subject(s) - whistler , ionosphere , physics , earth's magnetic field , geophysics , electron , plasma , computational physics , nonlinear system , transverse plane , coherence (philosophical gambling strategy) , magnetic field , quantum mechanics , structural engineering , engineering
The evolution of two counter‐streaming electron beams is shown by means of 2‐D kinetic simulations to lead to electron distributions and coherent localized bipolar plasma wave structures with features similar to those measured by the FAST satellite in the auroral ionosphere. Electrostatic whistler waves are generated at later times when the bipolar structures begin to lose coherence and break up in the dimension transverse to the geomagnetic field.