Zobrazeno 1 - 10
of 25
pro vyhledávání: '"G. S. Downs"'
Publikováno v:
Nature. 297:546-550
Ancient slope directions in the Martian Tharsis region are compared with new earth-based radar observations in an effort to detect tectonic deformations. Data were taken from 20-150 pixel/m Viking Orbiter images and from 200 m orthophotomosaics prepa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5fdfb6265b72e5709594f81183ee12b0
https://doi.org/10.1038/297546a0
https://doi.org/10.1038/297546a0
Autor:
Raymond F. Jurgens, L. Robinett, C. R. Franck, G. S. Downs, S. Brokl, M. A. Slade, K. H. Farazian, G. A. Morris, Frandics P. Chan
Publikováno v:
Geophysical Research Letters. 15:577-580
The Goldstone Deep Space Station ground-based synthetic aperture radar system has been used to obtain radar images of Venus with resolutions of close to 1.3 km. Observations were made at 12.5 cm wavelength using circular polarization. From 12 days of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::be6ea3a233d856adefc1f8a5198f2740
https://doi.org/10.1029/gl015i006p00577
https://doi.org/10.1029/gl015i006p00577
Publikováno v:
Radio Science. 5:475-478
Mars radar results during 1969 opposition, presenting elevation and radar brightness as function of longitude
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::acd0374520617b6bfb5dafd99bf76565
https://doi.org/10.1029/rs005i002p00475
https://doi.org/10.1029/rs005i002p00475
Publikováno v:
Science (New York, N.Y.). 193(4255)
Radar observations of Mars at centimeter wavelengths in May, June, and July 1976 provided estimates of surface roughness and reflectivity in three potential landing areas for Viking 1. Surface roughness is characterized by the distribution of surface
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8b00509de98b2cc20583ddfa566dec63
https://pubmed.ncbi.nlm.nih.gov/17747788
https://pubmed.ncbi.nlm.nih.gov/17747788
Autor:
G. S. Downs
Publikováno v:
Pulsars ISBN: 9789401179140
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5fb22934a16d873941ec23cf28465bda
https://doi.org/10.1007/978-94-011-7912-6_45
https://doi.org/10.1007/978-94-011-7912-6_45
Publikováno v:
Science (New York, N.Y.). 174(4016)
Radar observations of a narrow belt of the surface of Mars, centered at 16 degrees south latitude, show a very rugged terrain, with elevation differences greater than 13 kilometers from peak to valley. For nearby points, the relative altitude is meas
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::622f077fdfab68c31e5a7173cf310d2d
https://pubmed.ncbi.nlm.nih.gov/17801894
https://pubmed.ncbi.nlm.nih.gov/17801894
Autor:
G. S. Downs
Publikováno v:
Symposium - International Astronomical Union. 95:277-278
Eleven years of arrival time data for PSR 0833–45 collected at Goldstone, CA were analysed by fitting a simple model of the pulse period to the data in a least-squares sense. Four large jumps δP in period P of δP/P ~ −2 × 10−6 have occurred
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8a0653d018db0512676869358392bf52
https://doi.org/10.1017/s0074180900093025
https://doi.org/10.1017/s0074180900093025
Publikováno v:
Nature. 222:1257-1258
Pulsars observed for average energies at centimeter wavelengths, using azimuth elevation antenna
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e8169f243507141c310f3c741bd92718
https://doi.org/10.1038/2221257a0
https://doi.org/10.1038/2221257a0
Autor:
G. S. Downs, P. E. Reichley
Publikováno v:
Nature. 222:229-230
Pulsar PSR 0833-45 period decrease and rate of change in period increased between 24 February-3 March 1969, discussing contraction explanation
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c2b3c7d72b5632cd82c5c11d07e14477
https://doi.org/10.1038/222229a0
https://doi.org/10.1038/222229a0
Autor:
G. S. Downs, J. Krause-Polstorff
Publikováno v:
The Astrophysical Journal Supplement Series. 62:81
Previously published tables of geocentric arrival times for 24 pulsars covering a 12 year span are extended here to 14.5 years. The list of pulsars is extended by nine, most of which were observed for about 4 years. Known positins of these new object
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5fdb13f1620eb2e062368068c046dc71
https://doi.org/10.1086/191134
https://doi.org/10.1086/191134