Mesospheric Temperatures over Apache Point Observatory (32°N, 105°W) Derived from Sloan Digital Sky Survey Spectra

We retrieved rotational temperatures from emission lines of the OH airglow (8-3) band in the sky spectra of the Sloan digital\udsky survey (SDSS) for the period 2000-2014, as part of the astronomical observation project conducted at the Apache Point\udobservatory (32°N, 105°W). The SDSS temperatures show a typical seasonal variation of mesospheric temperature: low in\udsummer and high in winter. We find that the temperatures respond to solar activity by as much as 1.2 K ±0.8 K per 100 solar\udflux units, which is consistent with other studies in mid-latitude regions. After the seasonal variation and solar response were\udsubtracted, the SDSS temperature is fairly constant over the 15 year period, unlike cooling trends suggested by some studies.\udThis temperature analysis using SDSS spectra is a unique contribution to the global monitoring of climate change because\udthe SDSS project was established for astronomical purposes and is independent from climate studies. The SDSS temperatures\udare also compared with mesospheric temperatures measured by the microwave limb sounder (MLS) instrument on board the\udAura satellite and the differences are discussed