ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • earth atmosphere  (1)
  • modelling  (1)
Collection
Keywords
Publisher
Years
  • 1
    Electronic Resource
    Electronic Resource
    Attempt to assess astronomical “seeing” using a model (1996)
    Springer
    Astrophysics and space science 239 (1996), S. 237-245 
    Details
    ISSN: 1572-946X
    Keywords: Astronomical seeing ; seeing forecast ; modelling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The degradation of astronomic images by optical inhomogeneities in the earth's atmosphere is generally called “seeing”. It represents the angular diameter of the stellar images as seen through a turbulent medium. Several techniques can be used to determine this parameter. The knowledge of the optical strength of atmospheric turbulence, namely, the integrated structure coefficient of the atmospheric refractive index Cn 2 allows to predict the atmospheric optical quality in terms of seeing. We tried in this study to assess an astronomical seeing using a model forecast using meteorological data collected in three stations in Latin America from 1958 to 1991. The efficiency of the model is tested by comparison with simultaneous seeing measurements, at Chiliean astronomical sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00645778
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    A simple flux integration photometer for day time site testing at Oukaimeden (1992)
    Springer
    Experimental astronomy 2 (1992), S. 345-356 
    Details
    ISSN: 1572-9508
    Keywords: Site testing ; photometry ; earth atmosphere ; cloud cover ; extinction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We describe here a simple irradiance photometer built at Astrophysical and Geophysical Laboratory (LAG) for the integrated photometry of sun light at Oukaimeden, a 2700m summit in the Morrocan High Atlas. The solar irradiance measurement is performed simultaneously at three wavelengths to sample different levels of the sky transparency. The total of 1182 days in the data base shows that the number of clear hours is about 3086 per year which represents 65.32% of clear sky. The extinction coefficient is computed to evaluate the quality of the sky transparency at the site. We find that there is a seasonal effect for the sky transparency, and the monthly average of the extinction coefficient has a minimum value of about 0.05 in winter (oct-nov-dec) and a maximum of about 0.15 in summer (jun-jul) at 700 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00395985
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...