Fix esa_step dimension mismatch in CoDICE-Lo processing

[Copilot]

Change Summary

Overview

CoDICE-Lo processing fails in AWS with dimension mismatch error when LUT contains ESA sweep configurations with 104 steps instead of the hardcoded 128:

# Before: Hardcoded 128 steps
esa_steps = constants.NUM_ESA_STEPS  # Always 128
l1a_dataset["esa_step"] = xr.DataArray(np.arange(128), dims=("esa_step",))

# After: Derive from actual voltage data
voltage_data = sci_lut_data["esa_sweep_tab"][f"{esa_table_number}"]
esa_steps = len(voltage_data)  # 104 or 128 depending on configuration
l1a_dataset["esa_step"] = xr.DataArray(np.arange(esa_steps), dims=("esa_step",))

New Dependencies

None

New Files

None

Deleted Files

None

Updated Files

• imap_processing/codice/codice_l1a_lo_species.py

  • Derive esa_steps from voltage_data length instead of constant
  • Slice acquisition_time_per_step to match actual dimensions
  • Move voltage_data retrieval before esa_steps usage

• imap_processing/codice/codice_l1a_lo_angular.py

  • Apply same voltage_data-driven esa_steps logic
  • Reorder voltage_data retrieval before data reshaping

• imap_processing/codice/codice_l1a_lo_priority.py

  • Replace NUM_ESA_STEPS constant with dynamic sizing
  • Slice acquisition time array appropriately

• imap_processing/codice/codice_l1a_lo_counters_aggregated.py

  • Derive esa_step variable from voltage_data length
  • Remove hardcoded 128 assumption

• imap_processing/codice/codice_l2.py

  • Update compute_geometric_factors() to detect dataset esa_step dimension and slice lookup tables accordingly
  • Replace hardcoded 128 in energy validation with len(esa_kev)

Testing

Logic verified with unit tests for array slicing. Changes are backward compatible with existing 128-step configurations.

Warning

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• api.dev.imap-mission.com
  • Triggering command: /usr/bin/python python -m pytest imap_processing/tests/ialirt/unit/test_process_codice.py::test_create_xarray_dataset_basic -xvs (dns block)

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Original prompt

I have this error for codice_lo when I run the code in AWS. Where is this message in the repo?

[ERROR] 2026-01-13T20:09:42.512Z 0e6dc884-c62f-447b-8668-26bc51d00b82 Error processing codice_lo: cannot reindex or align along dimension 'esa_step' because of conflicting dimension sizes: {104, 128} (note: an index is found along that dimension with size=128)

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