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On the modulation of whistler turbulence by magneto‐acoustic perturbations
Author(s) -
Shukla Padma K.,
Spatschek Karl H.
Publication year - 1976
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/gl003i004p00225
Subject(s) - whistler , physics , instability , magnetosphere , modulation (music) , ultra low frequency , turbulence , wave packet , magneto , computational physics , plasma , quantum electrodynamics , geophysics , mechanics , atomic physics , acoustics , quantum mechanics , power (physics)
It is shown that a gas consisting of random‐phased high‐frequency whistler wave packets can become modulationally unstable with respect to low‐frequency magneto‐acoustic perturbations. The growth rate and threshold of the instability are calculated. The relevance of the instability to ULF emissions in the magnetosphere is discussed.