On the Heating of the Slow Solar Wind by Imbalanced Alfvén-wave Turbulence from 0.06 to 1 au: Parker Solar Probe and Solar Orbiter Observations
In this work we analyze plasma and magnetic field data provided by the Parker Solar Probe and Solar Orbiter missions to investigate the radial evolution of the heating of Alfvénic slow wind by imbalanced Alfvén-wave (AW) turbulent fluctuations from 0.06 to 1 au. in our analysis we focus on slow sola...
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| Language: | English |
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IOP Publishing
2024-01-01
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| Series: | The Astrophysical Journal Letters |
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| Online Access: | https://doi.org/10.3847/2041-8213/ad3805 |
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| author | Sofiane Bourouaine Jean C. Perez Benjamin D. G. Chandran Vamsee K. Jagarlamudi Nour E. Raouafi Jasper S. Halekas |
| author_facet | Sofiane Bourouaine Jean C. Perez Benjamin D. G. Chandran Vamsee K. Jagarlamudi Nour E. Raouafi Jasper S. Halekas |
| author_sort | Sofiane Bourouaine |
| collection | DOAJ |
| description | In this work we analyze plasma and magnetic field data provided by the Parker Solar Probe and Solar Orbiter missions to investigate the radial evolution of the heating of Alfvénic slow wind by imbalanced Alfvén-wave (AW) turbulent fluctuations from 0.06 to 1 au. in our analysis we focus on slow solar-wind intervals with highly imbalanced and incompressible turbulence (i.e., magnetic compressibility C _B = δ B / B ≤ 0.25, plasma compressibility C _n = δ n / n ≤ 0.25, and normalized cross helicity σ _c ≥ 0.65). First, we estimate the AW turbulent dissipation rate from the wave energy equation and find that the radial profile trend is similar to the proton heating rate. Second, we find that the scaling of the empirical AW turbulent dissipation rate Q _W obtained from the wave energy equation matches the scaling from the phenomenological AW turbulent dissipation rate Q _CH09 (with Q _CH09 ≃ 1.55 Q _W ) derived by Chandran & Hollweg based on the model of reflection-driven turbulence. Our results suggest that, as in the fast solar wind, AW turbulence plays a major role in the ion heating that occurs in incompressible slow-wind streams. |
| format | Article |
| id | doaj-art-11938667d30743f8ad12b6e82266d9b9 |
| institution | Kabale University |
| issn | 2041-8205 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal Letters |
| spelling | doaj-art-11938667d30743f8ad12b6e82266d9b92025-02-03T11:37:03ZengIOP PublishingThe Astrophysical Journal Letters2041-82052024-01-019672L1910.3847/2041-8213/ad3805On the Heating of the Slow Solar Wind by Imbalanced Alfvén-wave Turbulence from 0.06 to 1 au: Parker Solar Probe and Solar Orbiter ObservationsSofiane Bourouaine0https://orcid.org/0000-0002-2358-6628Jean C. Perez1https://orcid.org/0000-0002-8841-6443Benjamin D. G. Chandran2https://orcid.org/0000-0003-4177-3328Vamsee K. Jagarlamudi3https://orcid.org/0000-0001-6287-6479Nour E. Raouafi4https://orcid.org/0000-0003-2409-3742Jasper S. Halekas5https://orcid.org/0000-0001-5258-6128Department of Aerospace, Physics and Space Sciences, Florida Institute of Technology , Melbourne, FL 32901, USA ; sbourouaine@fit.eduDepartment of Aerospace, Physics and Space Sciences, Florida Institute of Technology , Melbourne, FL 32901, USA ; sbourouaine@fit.eduSpace Science Center, University of New Hampshire , Durham, NH 03824, USAJohns Hopkins University Applied Physics Laboratory , Laurel, MD 20723, USAJohns Hopkins University Applied Physics Laboratory , Laurel, MD 20723, USADepartment of Physics and Astronomy, University of Iowa , Iowa City, IA 52242, USAIn this work we analyze plasma and magnetic field data provided by the Parker Solar Probe and Solar Orbiter missions to investigate the radial evolution of the heating of Alfvénic slow wind by imbalanced Alfvén-wave (AW) turbulent fluctuations from 0.06 to 1 au. in our analysis we focus on slow solar-wind intervals with highly imbalanced and incompressible turbulence (i.e., magnetic compressibility C _B = δ B / B ≤ 0.25, plasma compressibility C _n = δ n / n ≤ 0.25, and normalized cross helicity σ _c ≥ 0.65). First, we estimate the AW turbulent dissipation rate from the wave energy equation and find that the radial profile trend is similar to the proton heating rate. Second, we find that the scaling of the empirical AW turbulent dissipation rate Q _W obtained from the wave energy equation matches the scaling from the phenomenological AW turbulent dissipation rate Q _CH09 (with Q _CH09 ≃ 1.55 Q _W ) derived by Chandran & Hollweg based on the model of reflection-driven turbulence. Our results suggest that, as in the fast solar wind, AW turbulence plays a major role in the ion heating that occurs in incompressible slow-wind streams.https://doi.org/10.3847/2041-8213/ad3805Slow solar windInterplanetary turbulenceAlfvén waves |
| spellingShingle | Sofiane Bourouaine Jean C. Perez Benjamin D. G. Chandran Vamsee K. Jagarlamudi Nour E. Raouafi Jasper S. Halekas On the Heating of the Slow Solar Wind by Imbalanced Alfvén-wave Turbulence from 0.06 to 1 au: Parker Solar Probe and Solar Orbiter Observations The Astrophysical Journal Letters Slow solar wind Interplanetary turbulence Alfvén waves |
| title | On the Heating of the Slow Solar Wind by Imbalanced Alfvén-wave Turbulence from 0.06 to 1 au: Parker Solar Probe and Solar Orbiter Observations |
| title_full | On the Heating of the Slow Solar Wind by Imbalanced Alfvén-wave Turbulence from 0.06 to 1 au: Parker Solar Probe and Solar Orbiter Observations |
| title_fullStr | On the Heating of the Slow Solar Wind by Imbalanced Alfvén-wave Turbulence from 0.06 to 1 au: Parker Solar Probe and Solar Orbiter Observations |
| title_full_unstemmed | On the Heating of the Slow Solar Wind by Imbalanced Alfvén-wave Turbulence from 0.06 to 1 au: Parker Solar Probe and Solar Orbiter Observations |
| title_short | On the Heating of the Slow Solar Wind by Imbalanced Alfvén-wave Turbulence from 0.06 to 1 au: Parker Solar Probe and Solar Orbiter Observations |
| title_sort | on the heating of the slow solar wind by imbalanced alfven wave turbulence from 0 06 to 1 au parker solar probe and solar orbiter observations |
| topic | Slow solar wind Interplanetary turbulence Alfvén waves |
| url | https://doi.org/10.3847/2041-8213/ad3805 |
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