von Karman Correlation Similarity of the Turbulent Interplanetary Magnetic Field
| Author(s) | Roy, Sohom | |
| Author(s) | Chhiber, R. | |
| Author(s) | Dasso, S. | |
| Author(s) | Ruiz, M. E. | |
| Author(s) | Matthaeus, W. H. | |
| Date Accessioned | 2022-01-26T19:36:29Z | |
| Date Available | 2022-01-26T19:36:29Z | |
| Publication Date | 2021-10-01 | |
| Description | This article was originally published in Astrophysical Journal Letters. The version of record is available at: https://doi.org/10.3847/2041-8213/ac21d2 | en_US |
| Abstract | A major development underlying much of hydrodynamic turbulence theory is the similarity decay hypothesis due to von Karman and Howarth here extended empirically to magnetic field fluctuations in the solar wind. In similarity decay the second-order correlation experiences a continuous transformation based on a universal functional form and a rescaling of energy and characteristic length. Solar wind turbulence follows many principles adapted from classical fluid turbulence, but previously this similarity property has not been examined explicitly. Here we analyze an ensemble of magnetic correlation functions computed from Advanced Composition Explorer data at 1 au, and demonstrate explicitly that the two-point correlation functions undergo a collapse to a similarity form of the type anticipated from von Karman's hypothesis. This provides for the first time a firm empirical basis for employing the similarity decay hypothesis to the magnetic field, one of the primitive variables of magnetohydrodynamics, and one frequently more accessible from spacecraft instruments. This approach is of substantial utility in space turbulence data analysis, and for adopting von Karman-type heating rates in global and subgrid-scale dynamical modeling. | en_US |
| Sponsor | This research supported in part by NASA Heliophysics Supporting Research grants 80NSSC18K1210 and 80NSSC18K1648, NASA Heliophysics Guest Investigator grant 80NSSC19K0284, and the NASA IMAP project under subcontract SUB0000317 from Princeton University, and the NASA PUNCH project under SWRI subcontract N99054DS. SD acknowledges partial support from the Argentinean grants UBACyT (UBA). The ACE magnetic field data were downloaded from https://spdf.gsfc.nasa.gov/pub/data/ace/mag/level_2_cdaweb/mfi_h3. | en_US |
| Citation | Roy, Sohom, R. Chhiber, S. Dasso, M. E. Ruiz, and W. H. Matthaeus. 2021. “Von Karman Correlation Similarity of the Turbulent Interplanetary Magnetic Field.” The Astrophysical Journal Letters 919 (2): L27. https://doi.org/10.3847/2041-8213/ac21d2. | en_US |
| ISSN | 2041-8213 | |
| URL | https://udspace.udel.edu/handle/19716/30122 | |
| Language | en_US | en_US |
| Publisher | Astrophysical Journal Letters | en_US |
| Keywords | Solar wind | en_US |
| Keywords | Interplanetary physics | en_US |
| Keywords | Interplanetary turbulence | en_US |
| Keywords | Plasma astrophysics | en_US |
| Keywords | Magnetohydrodynamics | en_US |
| Title | von Karman Correlation Similarity of the Turbulent Interplanetary Magnetic Field | en_US |
| Type | Article | en_US |
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