The solar Ca II K index and the Mg II core-to-wing ratio     

R. F. Donnelly  O. R. White  W. C. Livingston 《Solar physics》1994,152(1):69-76

The 1 index of the solar Ca II K line is compared with the core-to-wing ratio of satellite measurements of the Mg II h and k lines. The correlation coefficient r = 0.976 for the Nimbus-7 Mg II ratio during solar cycle 21 andr = 0.99 for the NOAA9 Mg II ratio in cycle 22. Linear regression analysis for the full dynamic range of both data sets is used to combine the Nimbus-7 and NOAA9 Mg II data. These relations permit the ground-based Ca K index to estimate the solar UV flux.  相似文献   

Shipboard sunphotometer measurements of aerosol optical depth spectra and columnar water vapor during ACE‐2, and comparison with selected land, ship, aircraft, and satellite measurements     

John M. Livingston  Vladimir N. Kapustin  Beat Schmid  Philip B. Russell  Patricia K. Quinn  Timothy S. Bates  Philip A. Durkee  Peter J. Smith  Volker Freudenthaler  Matthias Wiegner  Dave S. Covert  Santiago Gassó  Dean Hegg  Donald R. Collins  Richard C. Flagan  John H. Seinfeld  Vito Vitale  Claudio Tomasi 《Tellus. Series B, Chemical and physical meteorology》2000,52(2):594-619

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A solar granulation spectrogram     

J. G. Kirk  W. Livingston 《Solar physics》1968,3(4):510-512

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Solar rotation: The photospheric height gradient     

W. Livingston  R. Milkey 《Solar physics》1972,25(2):267-273

For selected pairs of Fraunhofer lines the height of formation has been calculated corresponding to that portion of the profile intercepted by the magnetograph exit slits. A photospheric height discrimination of 150–300 km is realized. In 1971 simultaneous measurements of equatorial angular velocity from spectroscopic displacements of these line pairs indicate no height gradient in excess of 1%.The disturbing influence of telluric line blends is analyzed. It is proposed that undetected telluric lines could account, at least in part, for the photospheric height gradient which has been found in a number of photographic investigations.Operated by the Association of Universities for Research in Astronomy, under contract with the National Science Foundation.  相似文献   

Telluric lines in the vicinity of λ5250 and λ6562å     

W. Livingston  L. Ramsey 《Solar physics》1973,31(2):317-318

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Some observations bearing on the problem of the short-period oscillations     

Robert Howard  William C. Livingston 《Solar physics》1968,3(3):434-438

Observations of solar velocity fields made simultaneously at Mount Wilson and at Kitt Peak with the same size aperture (5 arc-sec) and same position on the disk (± 1 arc-sec) are presented. The object is to clarify whether the short-period oscillations (SPO's) previously reported (Howard, 1967), could be caused by local seeing conditions. The time of onset and general character of the SPO's are found to be well correlated for the two sites, a condition that favors a solar origin. However, because correlation in complete detail did not prove possible, some doubt must remain regarding the source of the SPO's.Kitt Peak National Observatory Contribution No. 287.Operated by The Association of Universities for Research in Astronomy, Inc., under contract with the National Science Foundation.  相似文献   

Including predation mortality in stock assessments: a case study for Gulf of Alaska walleye pollock   总被引：1，自引：1，他引：0  

Hollowed  Anne Babcock; Ianelli  James N.; Livingston  Patricia A. 《ICES Journal of Marine Science》2000,57(2):279-293

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Sun as a star: Rotation rates from the Ca K-index     

Jagdev Singh  W. C. Livingston 《Solar physics》1987,109(2):387-391

Daily measurements for 18 months made at Tucson of the Ca K-index in integrated sunlight have been used to derive solar rotation rates. Power spectral analysis shows that one can obtain a well defined value of solar rotation rate in a period of six months, provided the data are fairly continuous. One might suppose it is possible to study the variation of solar (or stellar) rotation rate with time, a variation arising from a combination of differential rotation and shifts in the active latitude. A comparison between our observed rates and the prevailing dominant activity zones does not support this supposition, at least for the interval studied. Rather, our rates seem to depend on the circumstances of sampling and active region birth and decay.Operated by the Association of Universities for Research in Astronomy, Inc., under contract with the National Science Foundation.  相似文献   

Observational evidence for quantization in photospheric magnetic flux     

W. Livingston  J. Harvey 《Solar physics》1969,10(2):294-296

Observations are presented which suggest that away from sunspots photospheric magnetic flux is quantized. Assuming the elemental area of a magnetic region to be 1 (arc-sec)² the elemental field strength is 525 G.Kitt Peak National Observatory Contribution No. 501.Operated by the Association of Universities for Research in Astronomy, Inc., under contract with the National Science Foundation.  相似文献   

NGOs as intelligence agencies: The empowerment of transnational advocacy networks and the media by commercial remote sensing in the case of the Iranian nuclear program     

Sean Aday  Steven Livingston   《Geoforum》2009,40(4):514-522

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