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Low and high frequency waves generated by gyrophase bunched ions at oblique shocks
Author(s) -
Gurgiolo C.,
Wong H. K.,
Winske D.
Publication year - 1993
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 - 10.1029/93gl00854
Subject(s) - whistler , physics , ion , shock wave , computational physics , oblique case , bow wave , magnetohydrodynamics , bow shock (aerodynamics) , atomic physics , solar wind , mechanics , plasma , nuclear physics , linguistics , philosophy , quantum mechanics
The interaction of the solar wind with gyrophase bunched ions reflected at an oblique (Θ Bn = 45°) shock ( M A =8) is simulated using a 1D hybrid code. These ions are unstable to low frequency hydromagnetic waves as well as whistler waves. At some point in the hydromagnetic wave growth ion trapping occurs which restricts the local distribution in gyrophase to a higher degree than the input distribution. Given the growth rate of the MHD waves, gyrophase mixing is ineffective in isotropising the ions, except at the leading edge of the injected distribution.