New daytime observations of the OH Meinel bands and the Oxygen InfraRed Atmospheric band with the OSIRIS Imager

The InfraRed Imager (IRI) component of the OSIRIS instrument onboard the Odin satellite uses a two-dimensional tomographic technique to measure the Oxygen InfraRed Atmospheric (OIRA) and the Meinel OH band volume emission rate profiles, in the mesosphere, as a function of altitude and distance along the orbit track. This tomographic technique provides measurements contained in grid cells that have dimensions of one and twenty kilometers in the vertical and horizontal respectively. In this paper the relationship between the two band measurements is discussed and it is shown that there is a dayglow emission enhancement that starts near noon at high latitude and extends to the low latitude evening twilight. The peaks of these enhanced layers, as seen in both the OIRA and OH bands measurements, rise in altitude as they extend to lower latitudes. The two band emissions are used to infer the mesospheric atomic hydrogen profile during the daytime.