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| Format: | Preprint |
| Publié: |
2025
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| Accès en ligne: | https://arxiv.org/abs/2511.04850 |
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| _version_ | 1866909891786964992 |
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| author | Podladchikova, Olena |
| author_facet | Podladchikova, Olena |
| contents | Periodic Density Structures (PDS) observed in white-light coronagraphs represent a fundamental challenge to conventional solar wind paradigms. Through systematic analysis of multi-instrument observations and theoretical modeling, we demonstrate that coronal streamers operate as dual-nature systems: magnetohydrodynamic resonators that establish global periodicity through standing waves (122, 61, 41 minutes) and Laval nozzles that generate local flow structures through shock-driven oscillations (93, 47, 31, 23 minutes). The resonant mechanism dominates PDS formation, explaining their universal occurrence across 85\% of streamers, coherence over 10+ cycles, and persistence to 1 AU with only 0.1\% energy loss. Nozzle oscillations, while limited to 35\% of overexpanded streamers and maintaining only 1-2 cycle coherence, play crucial secondary roles in vortex formation and provide the essential converging-diverging geometry for supersonic solar wind acceleration. This dual-mechanism framework resolves longstanding puzzles in solar wind structuring while revealing the hierarchical organization of standing-wave and flow processes in astrophysical plasmas. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_04850 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The Dual Nature of Solar Wind Structuring: Resonant Standing Waves and Laval Nozzle Dynamics in Coronal Streamers Podladchikova, Olena Solar and Stellar Astrophysics 76W05, 85A30, 76E20 J.2 Periodic Density Structures (PDS) observed in white-light coronagraphs represent a fundamental challenge to conventional solar wind paradigms. Through systematic analysis of multi-instrument observations and theoretical modeling, we demonstrate that coronal streamers operate as dual-nature systems: magnetohydrodynamic resonators that establish global periodicity through standing waves (122, 61, 41 minutes) and Laval nozzles that generate local flow structures through shock-driven oscillations (93, 47, 31, 23 minutes). The resonant mechanism dominates PDS formation, explaining their universal occurrence across 85\% of streamers, coherence over 10+ cycles, and persistence to 1 AU with only 0.1\% energy loss. Nozzle oscillations, while limited to 35\% of overexpanded streamers and maintaining only 1-2 cycle coherence, play crucial secondary roles in vortex formation and provide the essential converging-diverging geometry for supersonic solar wind acceleration. This dual-mechanism framework resolves longstanding puzzles in solar wind structuring while revealing the hierarchical organization of standing-wave and flow processes in astrophysical plasmas. |
| title | The Dual Nature of Solar Wind Structuring: Resonant Standing Waves and Laval Nozzle Dynamics in Coronal Streamers |
| topic | Solar and Stellar Astrophysics 76W05, 85A30, 76E20 J.2 |
| url | https://arxiv.org/abs/2511.04850 |