The evolution of compressible solar wind turbulence in the inner heliosphere: PSP, THEMIS and MAVEN observations
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N. Andrés, F. Sahraoui et al.,The evolution of compressible solar wind turbulence in the inner heliosphere: PSP, THEMIS and MAVEN observations,https://arxiv.org/abs/2102.11781
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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.
Public Domain Mark 1.0
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
The first computation of the compressible energy transfer rate from ∼ 0.2 AU up to ∼ 1.7 AU is obtained using PSP, THEMIS and MAVEN observations. The compressible energy cascade rate εC is computed for hundred of events at different heliocentric distances, for time intervals when the spacecraft were in the pristine solar wind. The observational results show moderate increases of εC with respect to the incompressible cascade rate εI. Depending on the level of compressibility in the plasma, which reach up to 25 % in the PSP perihelion, the different terms in the compressible exact relation are shown to have different impact in the total cascade rate εC. Finally, the observational results are connected with the local ion temperature and the solar wind heating problem.