English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The location of an astronomical observatory is a key factor that affects itsscientific productivity. The best astronomical sites are generally those foundat high altitudes. Several such sites in western China and the Tibetan plateauare presently under development for astronomy. One of these is Ali, which atover 5000 m is one of the highest astronomical sites in the world. In order tofurther investigate the astronomical potential of Ali, we have installed alunar scintillometer, for the primary purpose of profiling atmosphericturbulence. This paper describes the instrument and technique, and reportsresults from the first year of observations. We find that ground layer (GL)turbulence at Ali is remarkably weak and relatively thin. The median seeing,from turbulence in the range 11- 500 m above ground is 0.34 arcsec, with seeingbetter than 0.26 arcsec occurring 25 per cent of the time. Under medianconditions, half of the GL turbulence lies below a height of 62 m. Theseinitial results, and the high altitude and relatively low temperatures, suggestthat Ali could prove to be an outstanding site for ground-based astronomy.

Optical turbulence at Ali, China -- Results from the first year of lunar scintillometer observations