{
  "id": "1011.3687",
  "version": "v1",
  "published": "2010-11-16T13:28:36.000Z",
  "updated": "2010-11-16T13:28:36.000Z",
  "title": "Coronal Mass Ejections - Propagation Time and Associated Internal Energy",
  "authors": [
    "P. K. Manoharan",
    "A. Mujiber Rahman"
  ],
  "comment": "18 pages, 6 figures",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "In this paper, we analyze 91 coronal mass ejection (CME) events studied by Manoharan et al. (2004) and Gopalswamy and Xie (2008). These earth-directed CMEs are large (width $>$160$^\\circ$) and cover a wide range of speeds ($\\sim$120--2400 {\\kmps}) in the LASCO field of view. This set of events also includes interacting CMEs and some of them take longer time to reach 1 AU than the travel time inferred from their speeds at 1 AU. We study the link between the travel time of the CME to 1 AU (combined with its final speed at the Earth) and the effective acceleration in the Sun-Earth distance. Results indicate that (1) for almost all the events (85 out of 91 events), the speed of the CME at 1 AU is always less than or equal to its initial speed measured at the near-Sun region, (2) the distributions of initial speeds, CME-driven shock and CME speeds at 1 AU clearly show the effects of aero-dynamical drag between the CME and the solar wind and in consequence, the speed of the CME tends to equalize to that of the background solar wind, (3) for a large fraction of CMEs (for $\\sim$50% of the events), the inferred effective acceleration along the Sun-Earth line dominates the above drag force. The net acceleration suggests an average dissipation of energy $\\sim$10$^{31-32}$ ergs, which is likely provided by the Lorentz force associated with the internal magnetic energy carried by the CME.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2010-11-16T13:28:36.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "coronal mass ejection",
      "associated internal energy",
      "propagation time",
      "travel time",
      "internal magnetic energy"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1016/j.jastp.2011.01.017",
      "journal": "Journal of Atmospheric and Solar-Terrestrial Physics",
      "year": 2011,
      "month": "Apr",
      "volume": 73,
      "number": "5-6",
      "pages": 671
    },
    "note": {
      "typesetting": "TeX",
      "pages": 18,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 877480,
      "adsabs": "2011JASTP..73..671M"
    }
  }
}