{
  "id": "2001.06023",
  "version": "v1",
  "published": "2020-01-16T19:00:45.000Z",
  "updated": "2020-01-16T19:00:45.000Z",
  "title": "The Relationship Between the Turbulence-Driving-Length and the Length-Scale of Density Structures in Magnetohydrodynamic Turbulence",
  "authors": [
    "Shmuel Bialy",
    "Blakesley Burkhart"
  ],
  "comment": "Submitted to ApJ Letters",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "Density fluctuations produced by supersonic turbulence are of great importance to astrophysical chemical models. A property of these density fluctuations is that the two-point correlation function decreases with increasing scale separation. The relation between the density decorrelation length-scale ($L_{\\rm dec}$) and the turbulence driving scale ($L_{\\rm drive}$) determines how turbulence affects the density and chemical structures in the interstellar medium (ISM), and is a key component for using observations of atomic and molecular tracers to constrain turbulence properties. We run a set of numerical simulations of supersonic magnetohydrodynamic turbulence, driven on varying scales from 1/2.5 to 1/7 the box length, and derive the $L_{\\rm dec}-L_{\\rm drive}$ relation as a function of driving-scale and the orientation of the line-of-sight (LOS) in respect to the mean magnetic field. We find that $L_{\\rm drive}$, $L_{\\rm dec}/L_{\\rm drive} = 0.231$ when averaging over all LOS. For LOS parallel to the magnetic field the density structures are statistically smaller and the $L_{\\rm dec}-L_{\\rm drive}$ relation is tighter, with $L_{\\rm dec}/L_{\\rm drive} = 0.129 \\pm 0.011$. We discuss our results in the context of using observations of chemical tracers in the ISM to constrain the dominant turbulence driving scale.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-01-16T19:00:45.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "density structures",
      "density fluctuations",
      "turbulence-driving-length",
      "relationship",
      "two-point correlation function decreases"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}