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NOAA GOES-14 & 15 went very recently in storage mode. With those also went the solar X-ray imagers (SXI), as GOES-16 & 17 do not have such instruments on board. Hence, my question:

Are there still any active solar X-ray imagers of other space agencies orbiting the Earth?

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The Hinode satellite has an active x-ray telescope that is routinely used to image the sun. And the NuSTAR extreme x-ray telescope can also be used for sun imaging (although its main job is looking for black holes)

Here is the latest XRT image of Hinode

There are also Extreme Ultraviolet telescopes (at 171Å that is less than an octave away from the conventional lower end of X-rays at 100Å) SDO. Stereo (Ahead) and SOHO all have EUV telescopes. The Atmospheric Imaging Assembly on the SDO satellite has sensors for wavelengths as short as 94Å, conventionally classed as X-rays

https://www.nasa.gov/jpl/nustar/searing-sun-seen-in-x-rays

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    $\begingroup$ Here is the latest XRT image of Hinode that I was looking for. Thanks! $\endgroup$
    – Serge Stroobandt
    Commented Apr 11, 2020 at 13:05
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    $\begingroup$ Thanks, I'll incorporate your suggestion. $\endgroup$
    – James K
    Commented Apr 11, 2020 at 13:13

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