SMILE Simulations

Orbits, Fields-Of-View & Target Observabilities

  • Selected Simulations
  • Description of Simulator Output
  • Selected Presentations


  • Selected Simulations (most recent first)

  • Single Soyuz orbit with new MHD simulation (green), and RASS point sources (circles) [just FOV window (hi-res, and enhanced)] :       Movie
  • 48 hour orbit, single test orbit from late January 2022, hi-res graphics :       Movie      Movie (reversed colours)     
  • 48 hour orbit, with results of GUMICS MHD simulation (green), and RASS point sources (circles) :       Movie     
  • Full year (2022) simulation at half-hour resolution, lo-res graphics, orbit MO3 :       Movie (large)      Final single frame     



    Brief Description of Main Simulator Output

  • (i) Orbit windows (top-left): Single example orbit (white curve), extracted from a full SMILE mission, in three planes [L to R] GSE-X-Y, GSE-X-Z and GSE-Y-Z (units are in Earth radii, RE). The Earth is at [0,0,0] and the (Earth-sized) North cusp (red circle), South cusp (pink circle) and magnetopause nose (orange circle) are shown, together with a sketch of the magnetopause and bowshock (orange curves). The cross indicates the SXI aim-point, and dotted lines indicate the SXI (white) and UVI (yellow) aiming directions. The Sun lies at large +ve X [Y=0, Z=0]. The green box shows the spacecraft position which moves along the orbit, synchronized with the other windows.
  • (ii) Angle window (bottom-left): Curves depict angles (y-axis, degrees) away from the SMILE SXI aim-point, of the Sun (yellow), Earth (blue), nose (orange) and North cusp (red) for the orbit. The dashed yellow horizontal line shows the Sun avoidance angle. Horizontal lines of dots at top and bottom show good observability times (object is in the SXI FOV) for nose (N, orange), North cusp (C, red) & South cusp (K, pink). Bar A (top, light blue) shows when the Earth is in the UVI FOV, bar B (dark blue) when the Earth is fully outside the SXI baffle, and bar S (yellow) when the Sun is outside of the Sun avoidance angle. Bar M (when white) indicates times when the spacecraft is outside of the magnetopause (and [when yellow] outside of the bowshock). These observability fractions are given numerically in the window centre. Angular diametres (degrees) of Earth, Nose, North and South cusp are also given (left), and various other parameters (e.g. slew speeds and line-of-sight [LOS] length through the magnetosheath) are also given. The SXI and UVI are turned off during the time bordered by the two vertical bars.
  • (iii) FOV window (right): Field-Of-View (FOV) of what is visible from the spacecraft position. The projection can be very wide and is 'North-up' with the x-axis parallel to the ecliptic. Features include: the SXI aim-point (cross at [0,0]), the Earth, the magnetopause nose (small orange/yellow oval, an Earth-sized disk in the GSE-Y-Z plane) and the North and South Cusps (red and pink Earth-sized spheres), the magnetopause (blue/green grid, Shue-model [alpha=0.6]), the Sun (yellow spot, radius=0.25 deg, off-image in the example above) and the Sun angle constraint (large yellow oval). A more realistic cusp shape has also been introduced that uses three magnetic field lines at 10, 12 and 14 H MLT (shown by the red [north] and pink [south] lines) that change position with the dipole and the season. The SXI FOV is shown by the large white rectangular box, with the SXI baffled area shown dashed orange. The UVI FOV is shown by the smaller dashed yellow box. Various data regarding positions, angles, times etc., are also shown in the window. The results of separate MHD simulations, modelling the magnetospheric X-ray emission, can also be plotted, as can the positions of cosmic X-ray sources.



    Selected Presentations (most recent first)

  • SMILE SST #10/ Consortium #4 17/10/17
  • SMILE SST #9 18/05/17
  • SMILE SXI FOVs
  • SMILE SST 16/09/16
  • Single page synopsis 25/07/16
  • ISSI-BJ China 07/07/16
  • Leicester 03/02/16



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  • This page is maintained by Andy Read (email, website) and was last updated on