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RHESSI: allow SUMFLAG=0 for single-detector files #304

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RHESSI: allow SUMFLAG=0 for single-detector files #304

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9cc738f
RHESSI: allow SUMFLAG=0 for single-detector files
settwi Aug 12, 2026
505fed5
pr 304 changelog
settwi Aug 12, 2026
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1 change: 1 addition & 0 deletions changelog/304.bugfix.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Allow loading of RHESSI fits files with `SUMFLAG=0` which only contain data from one detector.
8 changes: 3 additions & 5 deletions sunkit_spex/extern/rhessi.py
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Expand Up @@ -677,8 +677,9 @@ def load_spectrum(spec_fn: str):
"""
with fits.open(spec_fn) as spec:
rate_dat = spec["RATE"]
if rate_dat.header["SUMFLAG"] != 1:
raise ValueError("Cannot perform spectroscopy on un-summed RHESSI data.")
num_dets_used = str(rate_dat.header["DETUSED"]).count("|") + 1
if (rate_dat.header["SUMFLAG"] != 1) and (num_dets_used > 1):
raise ValueError("Cannot load RHESSI FITS files with >1 detector per file")

# Note that for rate, the units are per detector, i.e. counts sec-1 detector-1.
# https://hesperia.gsfc.nasa.gov/rhessi3/software/spectroscopy/spectrum-software/index.html
Expand Down Expand Up @@ -807,9 +808,6 @@ def load_srm(srm_file: str):
# handle attenuated responses and `None` simultaneously
all_srms = srm_options_by_attenuator_state(srm_file_dat)

if not all(h["header"]["SUMFLAG"] for h in all_srms.values()):
raise ValueError("SRM SUMFLAG's must be 1 for RHESSI spectroscopy")

sample_key = list(all_srms.keys())[0]
sample_srm = all_srms[sample_key]["data"]
low_photon_bins = sample_srm["ENERG_LO"]
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