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Hubble Space Telescope
COS Airglow

In the ultraviolet, the sky background contains important contributions from airglow lines, which vary from day to night and as a function of HST orbital position. Airglow lines may be an important consideration for spectroscopic observations at wavelengths near the lines. Both FUSE and HUT observed a variety of FUV airglow lines which may be present in COS data. Please click here to view this list.

Observations

We have received requests for high-S/N observations of the geocoronal Lyman-alpha line profile observed with the G130M and G140L gratings. Such observations would allow users to model and subtract the line wings from their spectra. On this Web page, we provide a listing of both deliberate and serendipitous airglow observations. If you discover any others, please let us know! Email help@stsci.edu To retrieve these datasets please use the HST archive.

Deliberate Airglow Observations

In these programs, COS airglow exposures were taken in parallel with STIS calibration observations.

ProposalAssociationLifetime PositionExposure TimeOptical ElementCentral Wavelength
11860 LB87100601 2800s G140L1105
11999 LBC4020801 1388s G130M1309
11999 LBC4040401 2500s G130M1309
12414 LBN6E10601 0s G130M1309
12414 LBN6E20601 2900s G130M1309
12414 LBN6E30601 2800s G130M1291
12414 LBN6E40601 2800s G140L 1105
12775 LBW3E10601 2800s G130M1291
12775 LBW3E20601 2800s G130M1291
13145 LC4KE20602 2560s G130M 1291
13145 LC4KE40602 2900s G130M1291
13145 LC4KE10602 2900s G130M 1291
13145 LC4KE30602 2900s G130M 1291
12775 LBW3E40602 2800s G140L (more to come)1105

Serendipitous Airglow Observations

Observations will be posted as they are released to the public.

ProposalDatasetExposure TimeOptical Element Central Wavelength
11616LB6B29010954sG130M1291
11616LB6B29020954sG130M1327
11616LB6B29030642sG160M1577
11616LB6B29040642sG160M1600
11616LB6B29050642sG160M1623
12426LBNM010102800sG160M1577
12426LBNM010202850sG160M1589
12426LBNM010302750sG160M1600
12426LBNM010402800sG160M1611
12426LBNM010503350sG160M1623
12275LBH4080101381sG130M1327
12275LBH4080205926sG130M1291
11727LB5B010102070sG130M
11727LB5B010202830sG160M
11522LB62030101150sG130M
11522LB62030201150sG130M
12034LBGH04010810sG130M
12034LBGH04020810sG130M
12034LBGH04030454sG160M
12034LBGH040401280sG160M
12034LBGH040501495sG160M
12870LC1VA80106944sG140L1105
12275 LBH458010 1381s G130M 1327
12275 LBH458020 5926sG130M 1291
12169 LBIYAM010 1460s G130M 1291