[PIPE2D-356] Model time-variability in background from darks Created: 14/Feb/19  Updated: 18/Mar/21

Status: Open
Project: DRP 2-D Pipeline
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Task Priority: Normal
Reporter: hassan Assignee: arnaud.lefur
Resolution: Unresolved Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Attachments: PNG File Background_with_time_split_with_sign.png     PNG File FluxInReducedData.png    
Story Points: 8

 Description   

Following a recent analysis of LAM dark frames, it has been determined that the light source is variable.

We therefore need to model the time variability in the background from darks, using a representative set of LAM data.

The accuracy for the model is to be determined.

 Comments   
Comment by ncaplar [ 14/Feb/19 ]

I just added one figure (FluxInReducedData.png) to illustrate the issue better, showing the structure and level of the background in the defocused data (exposure time = 297 sec). hassan recommended to add the figure "Background_with_time_split_with_sign.png" which shows that the mean background estimated via sigma clipping 1. is mainly a function of exposure time, 2. is different on two sides of defocus (W_ENFCAX is the header keyword used to described defocus).

Comment by hassan [ 18/Mar/21 ]

May already be addressed. arnaud.lefur?

Comment by arnaud.lefur [ 18/Mar/21 ]

mmmh surprising.
Is that scattered light from the room ? must be, that's 180 counts/hour, dark current should be around ~5-6 .

ncaplar any insight ?

Comment by ncaplar [ 18/Mar/21 ]

I dont know - this was maybe only case for some LAM data? Could we just verify that this is not the case with Subaru data now? If everything looks ok, this could be closed.

Generated at Sat Feb 10 15:51:45 JST 2024 using Jira 8.3.4#803005-sha1:1f96e09b3c60279a408a2ae47be3c745f571388b.