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Longitude

About: Longitude is a research topic. Over the lifetime, 2260 publications have been published within this topic receiving 54988 citations. The topic is also known as: angle of longitude.


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Journal ArticleDOI
TL;DR: In this paper, the authors present a simple analytical formulation of expected, minimum and maximum winds as a function of altitude to aid spacecraft and instrument design for future exploration, with particular reference to the descent dispersions of the Titan Mare Explorer (TiME) mission concept.

36 citations

Book ChapterDOI
TL;DR: In this paper, the results of a synchronously coupled ocean-atmosphere GCM are presented in comparison with observation, which consists of a six-layer oceanic GCM and a two-layer atmospheric GCM, each with a global horizontal resolution of four degrees latitude and five degrees longitude.

36 citations

Journal ArticleDOI
TL;DR: The longitudinal variation of the vertical upward drift velocity has two maxima in the northern hemisphere; in the southern hemisphere, however, a single maximum occurs at approximately 0600 UT.

36 citations

Journal ArticleDOI
TL;DR: In this paper, the Sq current system was studied for quiet days of 1976 and 1977 for observatories established near 76°degrees]E longitude in the northern hemisphere, and a special sperical harmonic analysis technique was used to separate the internal and external contributions of the quiet field variations and to determine the equivalent external current contours responsible for the sq field variations on the sixth and twenty-first of each month.
Abstract: The Sq current systems for quiet days of 1976 and 1977 were studied for observatories established near 76[degrees]E longitude in the northern hemisphere. A special sperical harmonic analysis technique was used to separate the internal and external contributions of the quiet field variations and to determine the equivalent external current contours responsible for the Sq field variations on the sixth and twenty-first of each month. The average ratio of the external to internal spectral power was 6.7 in 1976 and 7.4 in 1977. Focus positions for the India-Siberia region external Sq current vortex, near 22[degrees] to 29[degrees], were found to be at lower geomagnetic latitudes than for Europe and North America. The usual mid-latitude vortex current, reaching 11.0 to 13.2 [times] 10[sup 4] A in summertime, disappeared completely during winter months in both the years. The Sq current position was affected clearly by the off-spin axis position of the north geomagnetic pole. Throughout the 2 years, the authors also found small current vorticies near 70[degrees] to 80[degrees] geomagnetic latitude, which have been ascribed to auroral region activity on quiet days. 19 refs., 11 figs., 1 tab.

36 citations

Journal ArticleDOI
TL;DR: The number and apparent sizes of icebergs in the South Atlantic Ocean in midwinter were measured by radar and visually from F. S. Polarstern during the 1986 Winter Weddell Sea Project cruise as discussed by the authors.
Abstract: The numbers and apparent sizes of icebergs in the South Atlantic Ocean in midwinter were measured by radar and visually from F. S. Polarstern during the 1986 Winter Weddell Sea Project cruise. Results show that in a heavy sea (sea state 7–8), icebergs have to be at least 115 m in diameter to be detected at all and that detectability falls off severely for all bergs at ranges exceeding 8 n. mi. (15 km); that most bergs had diameters of less than 1 km with a preferred size of 400–500 m; and that a high density of icebergs in the latitude band 53°–56°S at longitude 19°–30°W contrasted with a virtual absence of bergs in the same latitude band at longitude 1°–9°E. The latter effect is ascribed to melt and wave–induced deterioration causing the disappearance of this iceberg population between the two sets of longitudes.

36 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023240
2022432
202142
202042
201960
201851