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Hi L1B - updates to gaint test filtering and geometric factor lookup #3391

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@tmplummer

Note: This work has been split into two sub-issues for review — see below.

Algorithm Description:

In a Hi tag-up meeting, Paul pointed out the problem with my implementation in recent PR that added gain test filtering and geometric factor lookup to L1B DE/ L1C (#3358).

  • Update to gain tests logic:
    • Don't use lookup table
    • look at voltages for first HVSCI (first ~3 packets), anything away from these voltages is gain test and should be removed. Can hard code delta values in the existing Hi utils.py where constants like this are defined.
  • Geometric factor update:
    • use time and voltages to lookup geometric factor. Time b/c we may have time dependent geometric factors. Note that existing implementation of ancillary files allows for time dependent factors already.
    • Key values for geometric factor lookup are difference between front and back detector voltages + tof. HV variables: tof_v, mcp_f_v, mcp_b_v, cem_f_v, cem_bk_a_v, cem_bk_b_v

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Ins: HiRelated to the IMAP-Hi instrumentLevel: L1Level 1 processing

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