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Mercury mission MESSENGER's %(MErcury Surface, Space ENvironment,GEochemistry, and Ranging Solar Assembly for X-rays (SAX) observed almost 700solar flares between May 28, 2007 and August 19, 2013, as cataloged by\citet{dennisSOLARFLAREELEMENT2015}. The SAX instrument, part of the X-raySpectrometer (XRS), operated at 1 -- 10 keV, partially overlapping the energyrange of the GOES X-ray spectrometers. SAX provides viewing angles differentfrom the Earth-Sun line and can therefore be used as a GOES proxy for partiallyor fully occulted flares as seen from Earth. For flares with GOES classes aboveC2 seen on-disk for both instruments, we found an empirical relationshipbetween the soft X-ray (SXR) fluxes measured by both SAX and GOES. Due to thedifferent energy response of the two SXR instruments, individual events candeviate on average by about a factor of two from the empirical relationship,implying that predictions of the GOES class of occulted flares from SAX dataare therefore accurate to within the same factor.  The distinctive GOES energy response in combination with the multithermalnature of flares makes it difficult for any instrument, even other soft X-rayspectrometers, to provide a GOES proxy more accurate than a factor of two.

GOES class estimation for behind-the-limb solar flares using MESSENGER SAX