UTC Coordinated Universal

More recent procednres of objective analysis practiced at most of the operational forecasting centers consist of the steps schematically described in Fig. 2. Most observed data are collected worldwide every 6 hours, say 00,06,... UTC (Coordinated Universal Time), and are blended into forecast values appropriate to the map time by the process referred to as data assimilation. The basic process of data assimilation, indicated by the boxenclosed by dashed lines in Fig. 2, consists of two steps One is objective analysis and the other is called initialization, which will be detailed in the next subsection. 

NIST F-l, which is now the official clock in the United States, provides the extremely accurate timekeeping necessary for modern technology-based operations. NIST F-l is also in the pool of atomic clocks used to define Coordinated Universal Time (known as UTC), the official world time. ... 

Coordinated Universal Time (UTC) follows International Atomic Time (TAl) exactly except for an integral number of seconds, presently 32. These leap seconds are inserted on the advice of the International Earth Rotation Service (lERS) to ensure that, on average over the years, the sun is overhead within 0.9 s of 12 00 00 UTC on the meridian of Greenwich. UTC is thus the modern successor of Greenwich Mean Time, GMT, which was used when the unit of time was the mean solar day. 

Coordinated Universal Time (UTC) UTC, an atomic time scale, is the basis for civil time. It is occasionally adjusted by one-second increments to ensure that the difference between the uniform time scale, defined by atomic clocks, does not differ from the earth s rotation by more than 0.9 sec. Differential A technique used to improve radionavigation system accuracy by determining positioning error at a known location and subsequently transmitting the determined error, or corrective factors, to users of the same radionavigation system, operating in the same area. 

Coordinated Universal Time (UTC) The time scale, maintained by the BIH (Bureau International de I Heure), that forms the basis of a coordinated dissemination of standard frequencies and time signals. 

Coordinated Universal Time (UTC) runs at the same rate as TAI. However, it differs from TAI by an integral number of seconds. This difference increases when leap... 

In the tables above and below, d, h, m indicate day, hour, minute, respectively, in "Universal Coordinated Time" (abbreviated UTC). To adjust for your particular time zone, first determine how many hours ahead or behind of UTC your time zone is, and then make the corresponding adjustment to the times shown above. Go here to determine the current UTC and find you relationship to it. 

Profiles of averaged factor scores for alertness (arbitrary units) for the outgoing flight and the homegoing flight (UTC Universal Time Coordinates). 

Profiles of three parameters for the EEG alpha band (alpha broadband power, alpha desynchronization index and alpha peak frequency) for the outgoing flight and the homegoing flight. One star denotes an error probability of less than 5%, two stars of less than 1% for the contrasts in the interaction of the factors "time of day" and "flight" (UTC Universal Time Coordinates). 

The exact time of occurrence of the accident was 8 15 a.m. UTC (Universal Time Coordinated), March 20, 1989. All times given in this chapter are expressed as UTC. Intensive evaporation of the liquid pool lasted for up to about eight hours, and the fire was totally extinguished by 5 00 p.m. on March 22 (Lithuanian State Committee for Environmental Protection, 1989). The fire also resulted in releases of nitrogen oxides, fluoride, and chlorine into the air and escape of liquid pollutants into a nearby river. However, because their released amounts have not been quantitatively estimated in the available references, we address only the dispersion of ammonia in the air in this chapter. We also do not address the ammonia releases from the fire. 

The Research Development and Technology Office (RDT) http //www.rita.dot.gov/rdt/ (accessed September 14, 2010) coordinates research across different offices and agencies, which includes overseeing the University Transportation Centers (UTC) program http // utc.dot.gov/ (accessed September 14, 2010). The UTC program focuses on transportation research and education at centers at more than 30 universities across the United States. 

Since the velocity of light is about 3.0 X 10 m/s, for instance, 3 m error corresponds to 10 ns. So, in this case, the receiver is able to synchronize to the GPS system time with an accuracy of about 10 ns. The GPS system time is derived from the atomic clocks which are implemented in the GPS ground control stations and the GPS satellites. The GPS Navigation Message included in the GPS signals contains parameters that allow the receiver to calculate the correction time from the GPS system time to the UTC (Universal Time Coordinated) with the accuracy of sub-microsecond order (Dana 1997). Therefore, the GPS receiver for time synchronization provides the precise UTC time. 

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