Near-infrared thermal emissivity from ground-based atmospheric dust measurements at ORM

作者：Lombardi G^*; Zitelli V; Ortolani S; Melnick J; Ghedina A; Garcia A; Molinari E; Gatica C

来源：Monthly Notices of the Royal Astronomical Society, 2011, 416(2): 1585-1590.

DOI：10.1111/j.1365-2966.2011.19152.x

• methods: data analysis
• methods: statistical
• site testing

We present an analysis of the atmospheric content of aerosols measured at Observatorio del Roque de los Muchachos (ORM; Canary Islands). Using a laser diode particle counter located at the Telescopio Nazionale Galileo (TNG) we have detected particles of 0.3, 0.5, 1.0, 3.0, 5.0 and 10.0 mu m size.
The seasonal behaviour of the dust content in the atmosphere is calculated. Spring has been found to be dustier than summer, but dusty conditions may also occur in winter.
A method to estimate the contribution of the aerosols' emissivity to sky brightness in the near-infrared (NIR) is presented. The contribution of dust emission to the sky background in the NIR has been found to be negligible compared to the airglow, with a maximum contribution of about 8-10 per cent in the K-S band in the dusty days.

• 出版日期2011-9