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Titolo:
Three-dimensional numerical simulation of MHD waves observed by the Extreme Ultraviolet Imaging Telescope
Autore:
Wu, ST; Zheng, HN; Wang, S; Thompson, BJ; Plunkett, SP; Zhao, XP; Dryer, M;
Indirizzi:
Univ Alabama, Ctr Space Plasma & Aeron Res, Huntsville, AL 35899 USA Univ Alabama Huntsville AL USA 35899 Aeron Res, Huntsville, AL 35899 USA Univ Alabama, Dept Mech Engn, Huntsville, AL 35899 USA Univ Alabama Huntsville AL USA 35899 Mech Engn, Huntsville, AL 35899 USA Univ Sci & Technol China, Dept Earth & Space Sci, Hefei 230026, Anhui, Peoples R China Univ Sci & Technol China Hefei Anhui Peoples R China 230026 oples R China NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA NASA Greenbelt MDUSA 20771 ard Space Flight Ctr, Greenbelt, MD 20771 USA Univ Space Res Assoc, Washington, DC USA Univ Space Res Assoc Washington DC USA ace Res Assoc, Washington, DC USA Stanford Univ, Hansen Expt Phys Lab, Stanford, CA 94305 USA Stanford UnivStanford CA USA 94305 Expt Phys Lab, Stanford, CA 94305 USA NOAA, SEC, Boulder, CO 80305 USA NOAA Boulder CO USA 80305NOAA, SEC, Boulder, CO 80305 USA Explorat Phys Int Inc, Milford, NH USA Explorat Phys Int Inc Milford NH USA lorat Phys Int Inc, Milford, NH USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
fascicolo: A11, volume: 106, anno: 2001,
pagine: 25089 - 25102
SICI:
0148-0227(20011101)106:A11<25089:TNSOMW>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
CORONAL MASS EJECTION; EULERIAN FICE SCHEME; SOHO/EIT OBSERVATIONS; TRANSIENT; FLOWS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Wu, ST Univ Alabama, Ctr Space Plasma & Aeron Res, Huntsville, AL 35899 USA Univ Alabama Huntsville AL USA 35899 Res, Huntsville, AL 35899 USA
Citazione:
S.T. Wu et al., "Three-dimensional numerical simulation of MHD waves observed by the Extreme Ultraviolet Imaging Telescope", J GEO R-S P, 106(A11), 2001, pp. 25089-25102

Abstract

We investigate the global large amplitude waves propagating across the solar disk as observed by the SOHO/Extreme Ultraviolet Imaging Telescope (EIT). These waves appear to be similar to those observed in H-alpha in the chromosphere and which are known as "Moreton waves," associated with large solar flares [Moreton, 1960, 1964]. Uchida [1968] interpreted these Moreton waves as the propagation of a hydromagnetic disturbance in the corona with itswavefront intersecting the chromosphere to produce the Moreton wave as observed in movie sequences of H-alpha images. To search for an understanding of the physical characteristics of these newly observed EIT waves, we constructed a three-dimensional, time-dependent, numerical magnetohydrodynamic (MHD) model. Measured global magnetic fields, obtained from the Wilcox SolarObservatory (WSO) at Stanford University, are used as the initial magneticfield to investigate hydromagnetic wave propagation in a three-dimensionalspherical geometry. Using magnetohydrodynamic wave theory together with simulation, we are able to identify these observed EIT waves as fast mode MHDwaves dominated by the acoustic mode, called magnetosonic waves. The results to be presented include the following: (1) comparison of observed and simulated morphology projected on the disk and the distance-time curves on the solar disk; (2) three-dimensional evolution of the disturbed magnetic field lines at various viewing angles; (3) evolution of the plasma density profile at a specific location as a function of latitude; and (4) computed Friedrich's diagrams to identify the MHD wave characteristics.

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Documento generato il 27/10/20 alle ore 10:57:41