IDEX Update event time calculation#2664
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lacoak21 wants to merge 1 commit intoIMAP-Science-Operations-Center:devfrom
Open
IDEX Update event time calculation#2664lacoak21 wants to merge 1 commit intoIMAP-Science-Operations-Center:devfrom
lacoak21 wants to merge 1 commit intoIMAP-Science-Operations-Center:devfrom
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tech3371
reviewed
Feb 5, 2026
| return met_to_ttj2000ns(met) | ||
| if coarse_time_sec2 is not None: | ||
| # Reconstruct the total seconds from the two 16-bit words | ||
| coarse_event_time = 65536 * coarse_time_sec1 + coarse_time_sec2 |
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I am little curious why they want to multiply coarse second time with 65536. I have seen this number is CoDICE and they are doing this:
center_times_seconds = (
acq_start_seconds + acq_start_subseconds / 65536 + (delta_times / 1e9)
)
Can you check with them if 65536 should be applied to fine_time_subs instead?
tech3371
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Feb 5, 2026
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tech3371
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I had one minor question to IDEX team but what you had is good.
p.s. yes, I remember that discussion and I thought I was way off based on response I got. I should have push back more :)
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Change Summary
Overview
The IDEX team realized they were using shcoarse for event time calculation. This was actually the time of the packet calculation and not the time when IDEX triggered.
I think @tech3371 you had this concern in the science team meeting a long time ago but I thought they said we were doing it right! Anyway this is the correct way to do it.
Updated Files
-imap_processing/idex/idex_l1a.py