Bibcode
Gonzalez, R); Saa, O; Solis, H; Duhalde, O; Palle, P. L.; Sanchez-Martinez, F.; Kadiri, S; Benkhaldoun, Z; Abdulsamad, MS; Alkhashlan, AS; Ambastha, A; Bhatnagar, A; Sumin, X; Zhen, H; Cole, DG; Kennewell, JA; Yasukawa, EA; Garcia, GJ; Sousa, EM; Lu, WMT; Labonte, BJ; Hieda, LS; Webster, L; Ulrich, RK; Zirin, H; Libbrecht, KG; Ingram, RL; Clay, Donald W.; Stebbins, Robin T.; Kupke, Renate; Jones, Patricia B.; Jones, Harrison P.; Leibacher, John W.; Grier, Jennifer; Forgach, Suzanne; Fischer, George; Hill, Frank
Bibliographical reference
Solar Physics, vol. 152, no. 2, p. 351-379
Advertised on:
7
1994
Journal
Citations
44
Refereed citations
36
Description
The Global Oscillation Network Group (GONG) Project will place a network
of instruments around the world to observe solar oscillations as
continuously as possible for three years. The Project has now chosen the
six network sites based on analysis of survey data from fifteen sites
around the world. The chosen sites are: Big Bear Solar Observatory,
California; Mauna Loa Solar Observatory, Hawaii; Learmonth Solar
Observatory, Australia; Udaipur Solar Observatory, India; Observatorio
del Teide, Tenerife; and Cerro Tololo Interamerican Observatory, Chile.
Total solar intensity at each site yields information on local cloud
cover, extinction coefficient, and transparency fluctuations. In
addition, the performance of 192 reasonable networks assembled from the
individual site records is compared using a statistical principal
components analysis. An accompanying paper descibes the analysis methods
in detail; here we present the results of both the network and
individual site analyses. The selected network has a duty cycle of
93.3%, in good agreement with numerical simulations. The power spectrum
of the network observing window shows a first diurnal sidelobe height of
3 x 10-4 with respect to the central component, an
improvement of a factor of 1300 over a single site. The background level
of the network spectrum is lower by a factor of 50 compared to a
single-site spectrum.