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ongoing Run 1.1 has revealed a background issue with phoSim.  A summary from Rachael Mandelbaum in the slack desc-dc2 channel (2 Mar 2018, 09:21am Pacific):\r\n\r\n```\r\nFor those who did not see all this traffic, a comparison between HSC data and the PhoSim run 1.1\r\nimages showed quite different levels of structure in the sky background.  In particular, PhoSim images\r\nseem to have an excess of small-scale structure.  The reason this is a problem is that if you have to\r\nratchet up the complexity of the background model in DM, then it can complicate measurements related\r\nto individual objects (e.g., galaxy photometry).  In other words: if the sky does not have strong\r\nfluctuations on small scales, the combined background + object modeling problem is quite different from\r\nthe case where it does have strong fluctuations on small scales.  So -- there is a concern that the\r\nPhoSim sky background may be turning this into an unrealistically complex problem.  This then leads to\r\nthe question of what to do about the rest of run 1.1, and what to do about actual DC2.\r\n```\r\n\r\nThis issue will define the phoSim tests to be done (scope and configuration) and their results.  These tests will aim to change phoSim configuration settings in a controlled way to observe the differences in resultant images.\r\n\r\n-------\r\n\r\nTable of tests\r\n\r\nTest(stream)|Changes to phoSim command file\r\n-----|-----\r\nRun1.1|backalpha 0.1 (airglowvariation not specified, default=1.0)\r\n000000|airglowvariation 0.0\r\n000001|backalpha 0.05\r\n000002   | airglowvariation 0.0 & backalpha 0.01\r\n000003   | airglowvariation 0.2\r\n000004   | airglowvariation 0.2 & backalpha 0.05\r\n000005   | airglowvariation 0.2 & backalpha 0.01\r\n\r\n-----\r\n\r\nLocation of images (at NERSC):\r\n```\r\n/global/projecta/projectdirs/lsst/production/DC2/DC2-phoSim-test_WFD-r/output/<stream>\r\n```"},"comment":{"url":"https://api.github.com/repos/LSSTDESC/DC2_Repo/issues/comments/370948730","html_url":"https://github.com/LSSTDESC/DC2_Repo/issues/140#issuecomment-370948730","issue_url":"https://api.github.com/repos/LSSTDESC/DC2_Repo/issues/140","id":370948730,"user":{"login":"rmandelb","id":1454906,"avatar_url":"https://avatars3.githubusercontent.com/u/1454906?v=4","gravatar_id":"","url":"https://api.github.com/users/rmandelb","html_url":"https://github.com/rmandelb","followers_url":"https://api.github.com/users/rmandelb/followers","following_url":"https://api.github.com/users/rmandelb/following{/other_user}","gists_url":"https://api.github.com/users/rmandelb/gists{/gist_id}","starred_url":"https://api.github.com/users/rmandelb/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/rmandelb/subscriptions","organizations_url":"https://api.github.com/users/rmandelb/orgs","repos_url":"https://api.github.com/users/rmandelb/repos","events_url":"https://api.github.com/users/rmandelb/events{/privacy}","received_events_url":"https://api.github.com/users/rmandelb/received_events","type":"User","site_admin":false},"created_at":"2018-03-06T22:16:18Z","updated_at":"2018-03-06T22:16:18Z","author_association":"CONTRIBUTOR","body":"John, regarding this:\r\n\r\n> IR bands can look like that\r\n\r\nThis is r-band.  So at minimum there seems to be some incorrect wavelength dependence of the airglow variation.\r\n"}}
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