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Title: MODELING SUPER-FAST MAGNETOSONIC WAVES OBSERVED BY SDO IN ACTIVE REGION FUNNELS

Recently, quasi-periodic, rapidly propagating waves have been observed in extreme ultraviolet by the Solar Dynamics Observatory/Atmospheric Imaging Assembly (AIA) instrument in about 10 flare/coronal mass ejection (CME) events thus far. A typical example is the 2010 August 1 C3.2 flare/CME event that exhibited arc-shaped wave trains propagating in an active region (AR) magnetic funnel with {approx}5% intensity variations at speeds in the range of 1000-2000 km s{sup -1}. The fast temporal cadence and high sensitivity of AIA enabled the detection of these waves. We identify them as fast magnetosonic waves driven quasi-periodically at the base of the flaring region and develop a three-dimensional MHD model of the event. For the initial state we utilize the dipole magnetic field to model the AR and include gravitationally stratified density at coronal temperature. At the coronal base of the AR, we excite the fast magnetosonic wave by periodic velocity pulsations in the photospheric plane confined to a funnel of magnetic field lines. The excited fast magnetosonic waves have similar amplitude, wavelength, and propagation speeds as the observed wave trains. Based on the simulation results, we discuss the possible excitation mechanism of the waves, their dynamical properties, and the use of the observations formore » coronal MHD seismology.« less
Authors:
 [1] ; ; ;  [2]
  1. Department of Physics, Catholic University of America, Washington, DC 20064 (United States)
  2. Lockheed Martin Solar and Astrophysics Laboratory, Palo Alto, CA 94304 (United States)
Publication Date:
OSTI Identifier:
21565382
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 740; Journal Issue: 2; Other Information: DOI: 10.1088/2041-8205/740/2/L33
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; EXTREME ULTRAVIOLET RADIATION; MAGNETIC FIELDS; MAGNETOACOUSTIC WAVES; MAGNETOHYDRODYNAMICS; MASS; PULSATIONS; SIMULATION; SOLAR CORONA; SOLAR FLARES; THREE-DIMENSIONAL CALCULATIONS ATMOSPHERES; ELECTROMAGNETIC RADIATION; FLUID MECHANICS; HYDRODYNAMICS; HYDROMAGNETIC WAVES; MECHANICS; RADIATIONS; SOLAR ACTIVITY; SOLAR ATMOSPHERE; STELLAR ACTIVITY; STELLAR ATMOSPHERES; STELLAR CORONAE; STELLAR FLARES; ULTRAVIOLET RADIATION