RHESSI software changes

Tolbert, Kim kim.tolbert at nasa.gov
Fri Mar 3 19:59:56 MST 2017


Dear RHESSI software users,

On Friday, March 3, we put some new RHESSI data accumulation software 
online in the SSW hessi atest directory.  For the most part, the changes 
should be transparent to almost every user.  The main changes are

  * Since January 2014, electronic errors in the detectors moved some
    events to energies up to 100-150 keV higher than their actual
    energy. These events are now identified and removed. This effect was
    getting worse with time. If you found higher energy emission than
    expected, you should look again with this new software.
  * Livetime accumulations at very small time bins (<512 binary
    microseconds)  were not being reported correctly.  Fine time bins of
    that order are generally only necessary for real spatial structure
    on the order of a few arcseconds.  If you were imaging sources far
    from the spin axis with Grid 1 this might have affected your results.
  * Accumulations across packet bunch boundaries were occasionally
    problematic. (The software can't process the full data request at
    once - it reads and processes groups or bunches of packets
    sequentially to accomplish that.)  The effect was minor - an
    extremely short time interval of incorrect data at the boundary. 
    Packet boundaries are now handled correctly.

More detail is provided at this link 
https://hesperia.gsfc.nasa.gov/ssw/hessi/doc/software/changes/sw_3-mar-2017.htm

(the full software change history is here: 
https://hesperia.gsfc.nasa.gov/ssw/hessi/doc/software/changes/sw_changes.html)

Richard and Kim
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