Keiji HAYASHI

   Happy Holiday!

My interests in the field of solar physics

• MHD (magnetohydrodynamic) simulation study of global solar corona and solar wind, using the solar magnetic field data taken at SDO/HMI, SOHO/MDI, WSO, GONG, SOLIS and MWO. In addition, the data from IPS measurements, a remote-sensing technique measuring solar wind speed and density, at Nagoya University, Japan, are often used to set further observation-based constraints for retrieving more realistic solar wind solutions. This unique data set allow MHD modelings to numerically reproduce/predict the electromagnetic and plasma conditions in the interplanetary space.
• Space-weather related topics : the global structure of the solar corona, solar wind and heliosphere, dynamic events such as coronal mass ejection, and the interplanetary disturbance propagation.
• Magnetic field and flow data, and data-pipeline processing of SDO/ HMI as a member of Vector Field Team
  • A movie (mpg, 20MB ; mp4, 15MB) shows the three-component magnetic field at and nearby the sunspot region at AR 11057; this active region is the first one the HMI observed since its operation had started. Mind that the movie was made early May 2010, and the analysis and reduction were of preliminary version.
  • Another (mpeg, 115MB ; mp4 44MB) shows the evolution of the field at the east half of the AR 11158. This anaglyph image offers a snapshot of three-dimensional view at a selected instant.

• Our near-real time coronal MHD simulation using daily-updated SDO/HMI (official page)
• MHD-derived/predicted solar corona; to-be-seen at the total eclipse on 2024 Apr. 08, 2023 Apr. 20, 2020 Dec. 14, 2019 Jul. 2, 2017 Aug. 21, 2016 Mar. 09, 2012 Nov. 13, 2010 July 11, 2009 July 22, and 2008 Aug. 1.
• Near real time solar wind maps by MHD tomography (or here) using IPS solar wind plasma data at Nagoya University, Japan, and the HMI solar magnetic field data.

Recent/Forthcoming Publications/Presentations

• publication/presentation lists
• some of my abstracts to meetings/conferences/workshops

Others: movies, plots and brief descriptions of my works and relavant topics

• gallery contents
  • MHD simulation of solar wind / corona
    brief descriptions on other models of solar wind / corona (the Parker solution, and so on)
  • test simulations (Orszag-Tang vortex, shock tube etc.)
  • visualizations (contour-surface drawing, volume rendering and line-of-sight integration of 3D scalar data, line tracing, etc.)
  • AniS java-applet animations (* I disabled jave-applet functionality sometime long ago, and these linked pages contain only links to mpg files)
    • Friedrichs diagram (phase velocity of MHD waves)
    • MHD wave propagation in aligned magnetic fields (group velocity)
    • spherical harmonics (de)composition for solar-surface magnetic field map (synoptic map data)
  • Demonstration of my plays with 3D-modeling language(s) (VRML or OBJ format) at sketchfab website
• sample FORTRAN 77 code for making PPM and BMP format files.

e-mail(*)

: