Keiji Hayashi

• MHD (magnetohydrodynamic) simulation study of global solar corona and solar wind
• solar photospheric magnetic field data and other solar/interplanetary data as the input for the simulation / analysis
• space weather related issues, such as the global coronal structures, the coronal mass ejection, and the interplanetary disturbance propagation

• My quasi-real time coronal MHD simulation using daily-updated SOHO/MDI data.
• Prediction of solar corona at the total eclipse of 2009 July 22 (with higher-resolution simulation) and 2008 August 1.
• MHD tomography using the solar-wind IPS observation (link to website at Solar Terrestrial Environment Lab. of Nagoya University, Japan).

Recent/Forthcoming Publications/Presentations

• "MHD Simulation of the Solar Corona Driven by the Time-Varying Solar-Surface Boundary Magnetic Field Based on The SOHO/MDI Measurement Data" Keiji Hayashi, AAS/SPD 2009 (#16.06), 14--18 June 2009 / Boulder, CO
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• "Non-dipolar solar wind structure observed in the cycle 23/24 minimum", M. Tokumaru, M. Kojima, K. Fujiki, and K. Hayashi, GRL (2009) Vol.36, L09101, doi:10.1029/2009GL037461 ;
• "Validation of Two MHD Models of the Solar Corona with Rotational Tomography", Alberto M. Vasquez, Richard A. Frazin, Keiji Hayashi, Igor V. Sokolov, Ofer Cohen, Ward B. Manchester IV, and Farzad Kamalabadi, ApJ (2008) Vol.682, 1328-1337
• "MHD Simulations of the Global Solar Corona around the Halloween Event in 2003 Using the Synchronic Frame Format of the Solar Photospheric Magnetic Field", Keiji Hayashi, Xue Pu Zhao, and Yang Liu, JGR (2008) Vol.113, A07104, doi:10.1029/2007JA012814
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  publication/presentation lists
  some of my abstracts to meetings/conferences/workshops

Gallery : movies, plots and brief descriptions of my works and interests

• gallery contents
  • MHD simulation of solar wind / corona
    brief descriptions on other models of solar wind / corona (the Parker solution, and so on)
  • test simulation (Orszag-Tang vortex, shock tube etc.)
  • visualization (contour-surface drawing, volume rendering, and line-of-sight integration of 3D data)
  • java-applet animation
    • Friedrichs diagram (phase velocity of MHD waves)
    • MHD wave propagation in aligned magnetic fields (group velocity)
    • spherical harmonics for calculation of solar surface magnetic field (∼1.6MB).
• sample FORTRAN 77 code for making PPM and BMP format file.

e-mail	:
phone	:
fax	:
postal address :
		Solar Physics Group, Cypress C W. W. Hansen Experimental Physics Laboratory 452 Lomita Mall Stanford University Stanford, CA 94305-4085