There are many satellites measuring the solar flux in EUV and X-ray at 1 AU (Ex: SDO, SOHO, etc). In the case of Mars: MAVEN looking sun in a small band of EUV and X-ray at Mars. Is there any approach, that I can use measurement at 1AU (Because they have a wideband of observations) and extrapolate to Mars and beyond?.

Thank You


1 Answer 1


For spacecraft/astrodynamics modeling, the acceleration due to the solar radiation pressure is specified in units of the solar flux: Watt per square meter as measured at 1 AU. As derived in the MathSpec of Nyx, to calculate the solar flux at any other point, simply divide the solar flux at 1 AU (which was about 1367 some years ago) by the norm squared of the vector from Mars (in your case) to the sun.

  • $\begingroup$ The page (link) is not opening!!. $\endgroup$
    – Martian
    Mar 19, 2021 at 9:03
  • $\begingroup$ @Martian that's odd, it works for me... $\endgroup$
    – ChrisR
    Mar 19, 2021 at 17:07

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