Simulations for Testing Farside Imaging


These data are freely available. We reserve the right to update it at any time. If you use the data or some product based on the data in a published paper, please include the following acknowledgment:

The simulations were performed by Thomas Hartlep and Nagi Mansour of NASA Ames Research Center. Their work was supported by NASA Living With a Star program, and the NASA Postdoctoral Program administered by Oak Ridge Associated Universities under contract with NASA.
and cite their relevant paper:
Hartlep, T., Zhao, J., Mansour, N. N., & Kosovichev, A. G. 2008, ApJ, 689, 1373
For further information, please contact Thomas Hartlep, the simulator of the data, at
thomas.hartlep at
or Junwei Zhao, the preparer of this website, at
junwei at

Description of the Data

Simulated datasets for farside imaging tests are available in FITS format. Data are obtained at 300km above the solar photosphere from a whole global simulation (a paper on the simulation under preparation, one copy will be given here once it is available) with 1-min cadence, and contain only radial velocities. Data containing the other two velocity components are available upon requests. For each dataset, the first two dimensions are for space domain along longitudinal and latitudinal, respectively, with a uniform grid size of 0.703125 heliographic degrees. The third dimension is time, and the time duration is 1024 minutes. Sound speed profile was modified to be in accordant with time-distance inversion results in solar active regions.

Four different datasets are available for testing farside imaging: three simulations with a single spot at the image center but with different spot sizes, and one simulation with two spots with 150 degrees apart. The radii for three different spots are 180 Mm, 90 Mm and 45 Mm for the large, medium and small spots, respectively. The spots for two spots simulations have same medium size. A paper on these simulated data and time-distance farside imaging of these tests is also under preparation, and will be placed here once it is available.


One Large Spot
One Medium Size Spot
One Small Spot
Two Medium Size Spots