Low-frequency waves associated with Langmuir waves in solar wind

Autor: R. G. Stone, Donat G. Wentzel, G. Thejappa
Rok vydání: 1995
Předmět:
Zdroj: Journal of Geophysical Research: Space Physics. 100:3417-3426
ISSN: 0148-0227
DOI: 10.1029/94ja03237
Popis: The Ulysses spacecraft has detected several events of low-frequency electromagnetic waves in association with Langmuir waves in the solar wind. The high time resolution observations show that the Langmuir waves are very intense and occur as broad peaks superposed by collapsing millisecond spikes. The low-frequency waves are identified as electromagnetic lower hybrid waves. The observed energy densities of these waves often exceed the strong turbulence thresholds. It is shown that none of the parametric decay instabilities involving Langmuir and low-frequency waves are energetically favorable to explain the present observations. The low-frequency waves are proposed to arise from currents associated with gradients in the electron beam originating at sites where Langmuir waves scatter the beam electrons.
Databáze: OpenAIRE
Pro tento záznam nejsou dostupné žádné jednotky.