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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
01 Jan 1970-Nature
TL;DR: In this article, five new pulsars have been discovered in a systematic search at low galactic latitudes, using the Mark I radio telescope at Jodrell Bank, and a radio frequency of 408 MHz.
Abstract: FIVE new pulsars have been discovered in a systematic search at low galactic latitudes, using the Mark I radio telescope at Jodrell Bank, and a radio frequency of 408 MHz. A total of 431 independent points were observed (many of them more than once) at integral degrees of galactic latitude and longitude, including all such points with latitude −1, 0, and + 1° and longitude 11° ≤l≤ 125°. The beamwidth of the telescope to half power was 0°.8.

24 citations

Journal ArticleDOI
TL;DR: In this article, the authors show that features of the auroral radio absorption move eastward between 00.00 and 14.00 hr L.T. and westward between 14.30 and 24.00 L. T. The typical velocity is 4° of longitude/min.

24 citations

Journal ArticleDOI
TL;DR: Wang et al. as discussed by the authors analyzed the relationship of temperature variability with topography, latitude, and longitude, and found that the rate of temperature change enhanced with the increase of elevation.
Abstract: Using the daily temperature data of 95 meteorological stations from Sichuan-Chongqing Region and its surrounding areas, this paper adopted these methods (e.g., linear regression, trend coefficient, geographical statistics, gray relational analysis and spatial analysis functions of GIS) to analyze the relations of temperature variability with topography, latitude and longitude. Moreover, the rank of gray correlation between temperature variability and elevation, longitude, latitude, topographic position and surface roughness also was measured. These results indicated: (1) The elevation affected temperature variability most obviously, followed by latitude, and longitude. The slope of the linear regression between temperature change rate and elevation, latitude and longitude was 0.4142, 0.0293 and −0.3270, respectively. (2) The rank of gray correlation between temperature change rate and geographic factors was elevation > latitude > surface roughness > topographic position > longitude. The gray correlation degree between temperature change rate and elevation was 0.865, followed by latitude with 0.796, and longitude with 0.671. (3) The rate of temperature change enhanced with the increase of elevation. Especially, the warming trend was significant in the plateau and mountain areas of western Sichuan, and mountain and valley areas of southwestern Sichuan (with the warming rate of 0.74°C/10a during the 1990s). However, there was a weak warming trend in Sichuan Basin and its surrounding low mountain and hilly areas. (4) The effects of latitude on temperature change rate presented the specific regulation, which the warming rate of low-latitude areas was more significant than that of high-latitude areas. However, they were consistent with the regulation that the increasing of low temperature controlled most of the warming trend, due to the effects of terrain and elevation on annual mean temperature. (5) Basically, temperature variability along longitude direction resulted from the regular change of elevation along longitude. It was suggested that, in Sichuan-Chongqing Region, special features of temperature variability largely depended on the terrain complexity (e.g., undulations, mutations and roughness). The elevation level controlled only high or low annual mean temperature and the range of temperature change rate in the macro sense.

24 citations

Journal ArticleDOI
TL;DR: In this article, a linear Boussinesq model with thermal forcing was proposed to reproduce the observed diurnal temperature and pressure oscillations with properly selected parameters, neglecting global effects to focus on a single transect across a single ideal continent.
Abstract: Harmonic analysis of summer Automated Surface Observing System (ASOS) data over North America shows sun-following diurnal temperature and pressure oscillations with amplitudes increasing in the western United States (i.e., 5–8 K and 60–120 hPa, respectively) due to larger sensible heating in the dryer western terrains. The phases of temperature and pressure (i.e., 220° and 110°) are constant with longitude after an interfering eastward propagating wave is subtracted. Tidal amplitudes and phases shift significantly with season. A linear Boussinesq model with thermal forcing can reproduce these observed oscillations with properly selected parameters. The model neglects global effects to focus on a single transect across a single ideal continent. A damping parameter α ranging from 5 × 10−5 to 9 × 10−5 s−1, comparable to the inertia and Coriolis parameters, is needed to explain the temperature phase lag relative to local solar noon (40°–50°C). The phase lag between surface pressure minimum and temper...

24 citations

Journal ArticleDOI
TL;DR: In this paper, the influence of planetary waves on the intensity variations of 557.7-nm airglow emission was investigated using simultaneous measurements at four different stations located between 37°N and 56°N in latitude, 36°E and 3°W in longitude.
Abstract: We provide evidence of the influence of planetary waves on the intensity variations of the 557.7-nm airglow emission. The comparison relies on simultaneous measurements at four different stations located between 37°N and 56°N in latitude, 36°E and 3°W in longitude: meteor wind observations in France and USSR and optical measurements at 557.7 nm in France and Spain, in July 1971. An oscillation of period near 2 days had been identified in the wind data; it is also apparent on the nightglow intensity variations. Its characteristics are well accounted for by the first symmetric mode of the 52- hour period planetary oscillation of horizontal wave number 3, described previously (Glass et al., 1975). A 4±1 hour period gravity wave apparently present in the data of the French stations is discussed.

24 citations


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