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.

Observed Dynamic Structure of an Intense Oceanic Cyclone

Abstract: A major extratropical cyclone developed over the East China Sea during the initial phase of the AMTEX'75. Using cross-section analyses the dynamic structure of the cyclone is investigated with an emphasis on obtaining a better understanding of the physical mechanisms controlling the development and maintenance of this intense oceanic system. The dynamic and kinematic variables examined include ageostrophic acceleration, potential and absolute vorticity, and vertical and horizontal motions. During the 24-h period following 1200 UTC 14 February, the surface cyclone moved eastward more than 22° longitude, while the upper-level trough propagated only about 15°. In the same period, the central pressure at the surface dropped more than 20 mb while the areas extent of the closed circulation showed little change. Vertical decoupling of the wave-cyclone system is suggested by this discrepancy in phase speed, and by the temporal evolution of the trough axis and the height fields during the lust 12 h. Laten...

A Large-Scale Longitudinal Variation in Surface Temperature in the North Pacific

Abstract: A large-scale longitudinal variation in surface temperature in the North Pacific is described by an analysis of some existing data and some newer data. When monthly mean surface temperatures are plotted against longitude at mid-latitudes there is nearly always a temperature maximum in the eastern Pacific and a minimum in the central Pacific. Long-term averages of monthly mean temperature data, as well as independent surface temperature data from individual cruises, show a similar maximum and minimum. At 35°N and 40°N the mean positions of the maximum and minimum are further west in summer than in winter, and for a given month are further west at 35°N than at 40°N. The east-west scale of the temperature feature is defined to be the longitudinal distance between the positions of the adjacent temperature extremes and is shown to have an average value of about 2000 km nearly independent of season and latitude. The temperature scale is defined to be the difference between the maximum and minimum tempe...

Combined solution for low degree longitude harmonics of gravity from 12‐ and 24‐hour satellites

Abstract: Combined solution for low degree longitude harmonics of gravity from twelve and twenty-four hour satellites

Probability of occurrence of planetary ionosphere storms associated with the magnetosphere disturbance storm time events

Abstract: . The ionospheric W index allows to distinguish state of the ionosphere and plasmasphere from quiet conditions (W = 0 or ±1) to intense storm (W = ±4) ranging the plasma density enhancements (positive phase) or plasma density depletions (negative phase) regarding the quiet ionosphere. The global W index maps are produced for a period 1999–2014 from Global Ionospheric Maps of Total Electron Content, GIM-TEC, designed by Jet Propulson Laboratory, converted from geographic frame (−87.5:2.5:87.5° in latitude, −180:5:180° in longitude) to geomagnetic frame (−85:5:85° in magnetic latitude, −180:5:180° in magnetic longitude). The probability of occurrence of planetary ionosphere storm during the magnetic disturbance storm time, Dst, event is evaluated with the superposed epoch analysis for 77 intense storms (Dst ≤ −100 nT) and 230 moderate storms (−100