8/10/2023 0 Comments Sun corona clipart![]() The daily quasi-real-time simulation shown above assumesįixed density and temperature at the coronal hole base The simulation scheme here is based on the Lax-Friedrichs method that isĪ simplified version of the TVD Roe/Godunov method. Time-dependent three-dimensional MHD model is used toįrom PFSS-based initial state to steady state of the sub/trans-alfvénic solar corona. The spherical harmonics decomposition up to the 5th order is used to calculate PFSS solution. The boundary and three-dimensional initial value of the magnetic fieldĪre then calculated with the potential-field source-surface (PFSS) model. initial and boundary values of magnetic field :.Our correction is based on the spline extrapolation with respect to both time and space, proposed and tested by X. The polar field correction is needed to improve model outputs and enhance our understandings on the solar corona and solar wind. Measurement of polar field is generally of low quality. *) Definitive version of input synoptic or synchronic frame maps of solar-surface magnetic fieldĪnd MHD output data are generated when all calibrations are applied, usually a month after observations. Simulations with definitive synoptic map dataĭefinitive once-a-Carrington-Rotation data (a) Polar-field correction was applied to the input MDI synoptic map data, except for a few earliest weeks. (b) SOHO/MDI daily-updated synoptic maps were used until the end of 2010. (c) Transition of input data, from MDI to HMI. (d) SDO/HMI daily synoptic maps have been regularly generated at JSOC, and used in this daily-MHD model, from July 1. (*) Many movie frames are missing because of disk failutre. Please mind that the format and specifications of this FITS file are different from those at JSOC database. The second to eighth 80-layer blocks are respectivelyįor the temperature (in MK), V_r, V_theta, V_phi (in km/s), B_r, B_theta and B_phi (in Gauss). The first 80-layer block, (*,*,0:79), is for the density (in count/cc) at heights of (1.01 + i * 0.05) Rs, i.e., from 1.01 Rs to 4.96 Rs with a fixed equi-radius interval of 0.05Rs. The size of this cubic data is 32 x 64 x 640. This single FITS file contains all eight simulated MHD variables, from 1.01 to 4.96 Rs. In CSV (Comma Separated Values plain text) formatĪ cubic data containing all eight MHD variables : Latest data files *Please contact us for details of the simulation and data. NRT daily simulation data generated through automated JSOC data pipeline are found at The elapsed time depends upon primarily the largest absolute eigen values of the hyperbolic equation system, or roughly the largest value of the magnetic field strength (the CFL condition). Plots of PFSS calculations above are updated usually around 10:30AM PT.Ī daily MHD real-time low-resolution simulation is completed around 11:30 AM to 12:30PM PT. Left : field lines and bases of open fieldĪround 14:00 UT (7 or 8AM PT) everyday, a latest daily-updated synoptic map is generated in JSOC data pipeline.Īt 10 AM PT, the coronal MHD module loads the latest map and start a time-relaxation simulation. Input NRT Synchronic-Frame Map of Solar-Surface Magnetic Field : Input data and initial PFSS magnetic fieldĭetails of this simulation is described inįor information about instruments, data, and the status of data processing, please visit Using SDO/HMI magnetic-field synoptic data ![]() Of HMI daily-MHD model.ĭerived with time-dependent three-dimensional MHD simulation
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