Change CDF output variables to UTC string, matching algorithm document#2827
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maxinelasp merged 2 commits intoMar 10, 2026
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Change Summary
Overview
Converts
start_timeandend_timein the GLOWS L2 CDF output from raw J2000nanoseconds to UTC strings, matching the format specified in the algorithm
document. Fixes a CDF writing error caused by mismatched attribute types.
File changes
imap_processing/glows/l2/glows_l2.py: Addedutc_time_variableslist(
start_time,end_time) and a conversion step increate_l2_datasetthatcalls
met_to_utc(ttj2000ns_to_met(value))before writing these fields tothe output dataset.
imap_processing/cdf/config/imap_glows_l2_variable_attrs.yaml: Updatedtime_data_defaultsto use string-compatible CDF attributes (FILLVAL: ' ',FORMAT: A30,VALIDMIN/VALIDMAX: ' '). The previousFILLVAL: 0andFORMAT: I1000caused a cdflibValueErrorwhen writing string data becausecdflib infers CDF_CHAR type from the string data but then fails to convert an
integer FILLVAL to that type.