Detection of langmuir solitons: implications for type III burst emission mechanisms at 2ωₚₑ

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https://link.springer.com/article/10.1007/BF00644054

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https://doi.org/10.1007/BF00644054
 http://hdl.handle.net/11603/30576

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UMBC Goddard Planetary Heliophysics Institute (GPHI)

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https://orcid.org/0000-0002-5317-988X

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1996-03

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journal articles
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Thejappa, G., Stone, R.G. & Goldstein, M.L. Detection of langmuir solitons: implications for type III burst emission mechanisms at 2ωₚₑ . Astrophys Space Sci 243, 195–198 (1996). https://doi.org/10.1007/BF00644054

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract

We present the experimental verification of existing theoretical models of emission mechanisms of solar type III bursts at the second harmonic of the plasma frequency, ω ₚₑ . This study is based on the detection of Langmuir and envelope solitons by the Ulysses spacecraft inside three type III burst source regions. We show that the oscillating-two-stream instability, coherent radiation by Langmuir solitons and stochastic phase mixing of the Langmuir waves in the strong turbulence regime are the appropriate emission mechanisms at 2ω ₚₑ .