The Correlation Between Speed of Flare Ribbon and the Normal Component of Magnetic Field

ORAL

Abstract

In a simplified two-ribbon flare model, the expansion speed of flare ribbons V$_{\mathrm{r}}$ and the normal component of magnetic field B$_{\mathrm{n}}$ swept by the flare ribbons are two contributing factors in deriving the local magnetic reconnection rate, i.e., E$_{\mathrm{rec}} \quad =$ V$_{\mathrm{r}}$B$_{\mathrm{n}}$. In this project, I investigate the correlation between V$_{\mathrm{r}}$ and B$_{\mathrm{n}}$ in a case study of a two-ribbon M6.5 flare (SOL2015-06-22T18:23). The morphology and evolution of one ribbon of this flare were well captured by exceptionally high resolution H-alpha images from the Visible Imaging Spectrometer (VIS) at the 1.6 m New Solar Telescope (NST), with which I am able to track the ribbon motion and calculate V$_{\mathrm{r}}$. The photospheric line-of-sight (LOS) magnetograms, obtained with the Goode Solar Telescope(GST), are used as an approximation of B$_{\mathrm{n}}$. Based on a sample of four sections of the ribbon, a moderate negative correlation is found between V$_{\mathrm{r}}$ and B$_{\mathrm{n}}$This result suggests a tendency for flare ribbons to slow down in strong magnetic field regions.

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Authors

  • Yuqian Wei

    New Jersey Inst of Tech

  • Debbie Andres

    Department of Applied Physics and Department of Physics, Columbia University, Istituto Italiano di Tecnologia, Graphene Labs, Italy, Department of Physics and Astronomy, Purdue University, Department of Electrical Engineering, Princeton University, Department of Applied Physics and Applied Mathematics, Columbia University, NJIT, New Jersey Inst of Technology, New Jersey Inst of Tech, New Jersey Institute of Technology, Center for Advanced Radiation Sources, University of Chicago, High Pressure Science and Technology Advanced Research, State University of New York at Stony Brook, Rutgers University, NIST, Brookhaven National Laboratory, University of Chicago, University of South Florida, ETH Zurich, Max Planck POSTECH/Korea Research Initiative, University of Virginia, Rutgers University - Camden, New Jersey Institute of technology, Shaanxi Normal University, Pohang Science and Technology University, Sungkyunkwan University, Northern Illinois University and Argonne National Laboratory, Beijing National Laboratory for Condensed Matter Physics , and Institute of Physics, Chinese Academy of Sciences, Rutgers U., Orsova Engineers, U.S. Naval Research Laboratory, Center for Space Science and Engineering Research, Virginia Tech, Virginia., Princeton University, NASA Goddard Space Flight Center, Villanova University, SOFIA/USRA, Jet Propulsion Laboratory, Hudson Regional Health Commision, Rutgers University, College of William & Mary, Department of Physics, Drexel University, Drexel University, Drexel Universty, University of Massachusetts Amherst, Pohang Institue of Science and Technology, Indiana University - Purdue University Indianapolis, Department of Physics, University of Maryland, Naval Research Laboratory, Towson Univ, Rice University, Independence Blue Cross Cardiovascular Research Center, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, Department of Physics, Temple University, PulseTorr LLC, Department of Chemistry, West Chester University, Department of Physics, West Chester University, College of William and Mary Dept. of Physics, University of Virginia Dept. of Materials Science and Engineering, United States Naval Academy, Rutgers The State University of New Jersey, Univ of Maryland-College Park, Los Alamos National Laboratory, POSTECH, New Jersey Institute of Technology, Department of Electrical and Computer Engineering, HamSCI/ARRL, Virginia Tech, Rutgers University-Camden, University of Washington, Rutgers, The State University of New Jersey