Solar site-testing campaign of JOSO on the Canary Islands in 1979

Details Solar site-testing campaign of JOSO on the Canary Islands in 1979 Solar site-testing campaign of JOSO on the Canary Islands in 1979

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...109...77b&link_type=abstract

Astronomy and Astrophysics, vol. 109, no. 1, May 1982, p. 77-89. Research supported by the Deutsche Forschungsgemeinschaft.

Astronomy and Astrophysics

Astrophysics

17

Astronomical Photography, Site Selection, Solar Granulation, Solar Observatories, Telescopes, Canary Islands, Diurnal Variations, Earth Atmosphere, Electrophotometry, Image Resolution, Scintillation, Test Equipment

Scientific paper

Results of the campaign of testing undertaken by the European JOSO (Joint Organization for Solar Observations) in order to find an excellent site for solar observations are presented. Measurements with telescopes of 40 and 45 cm aperture and photoelectric seeing measurements were made at the sites of Izana and Roche de los Muchachos on the Canary Islands of Tenerife and La Palma, respectively. Observations obtained on 160 days between April and November, 1979 demonstrate the superiority of Izana in the area of image sharpness, although both sites offer an increase of one order of magnitude in the duration of good seeing compared to existing European stations. Photographs of the solar granulation taken from July to November confirm the superiority of Izana, where 4.5% of the exposures exhibit very high quality compared to 1.4% at Roche de los Muchachos. Analysis of meteorological records indicates that Izana is capable of providing 3000 hour/year of usable solar observations, and suggest an explanation for the higher quality of the Izana site.

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