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| الهيئة العامة للطيران المدني | |
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| Agency overview | |
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| Jurisdiction | UAE |
| Agency executive |
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| Website | www |
The General Civil Aviation Authority (GCAA, Arabic: الهيئة العامة للطيران المدني) is the federal civil aviation authority of the United Arab Emirates. Its headquarters is in Al Rawdah, Abu Dhabi.[1]
The GCAA is the federal responsible authority for the control and regulation of civil aviation in the UAE.
It was established in 1996 by Federal Cabinet Decree (Law 4) to regulate Civil Aviation and provide designated aviation services with emphasis on safety and security and to strengthen the aviation industry within the UAE and its upper airspace. In late 2009, the GCAA opened its new Air Navigation Centre, The Sheikh Zayed Centre, which is considered the largest and busiest air traffic management facility in the Middle East as well as one of the world's most technically advanced centres in terms of its design.[2]
1. Promulgate the general policy for civil aviation and propose laws and regulations which ensure the organization thereof, forming the necessary committees to implement such policies and representing the State in the negotiations on matters involving its functions, and proposing the conclusion of bilateral agreements in the area of civil aviation and aerial meteorology, in accordance with the provisions of the constitution.
2. Promulgate rules related to overflight of the territory of the State, landing and departing from its airports, and the conditions of carriage of passengers, cargo and mail according to the Law, and in coordination with local authorities.
3. Determine areas over which flying is prohibited, restricted or dangerous on coordination with the concerned authorities in the State.
4. Determine aerial navigation routes to be followed on entry, departure or overflight by those aircraft given permission to transit the territory of the State.
5. Determine the condition for the registration of aircraft in the State, the registering and issue of the airworthiness certificates, and the specifications of nationality and registration symbols, and notifying the International Civil Aviation Organization regarding aircraft to which these matters apply and if any changes that may occur thereto.
6. Determine requirements for the appointment of aircraft crew members and issue the necessary licenses and related documents as appropriate.
7. Determine the documents which should be carried on board aircraft in the conduct of and inspect compliance of those aerial navigation aircraft registered in the State.
8. Promulgate the rules which ensure protection of aerial navigation lights and signals, in coordination with the local authorities.
9. Undertake the Air Traffic Control operations in the State.
10. Ensure enforcement of accepted international regulations and standards at airports of the State, including the aviation agreement, and following up their execution in coordination with the local authority.
11. Promulgate and organize training programs as appropriate to various aviation specialties.
12. Supervise the maintenance and repair of aircraft and the extent of conformity of manufacture with international and local specifications, and the locations in which such maintenance and repair are accomplished, and issue the necessary certificates and licenses for conducting such activities.
UAE GCAA organization structure Archived 2014-05-01 at the Wayback Machine
The GCAA headquarters are in Abu Dhabi.[9][10] The headquarters, built after the GCAA's establishment as a former directorate, includes an air traffic control center and supporting facilities. In June 2009, GCAA shifted its Air Navigation Services to the newly built Sheikh Zayed Air Navigation Centre in Abu Dhabi. The Sheikh Zayed Centre is considered the largest and busiest air traffic management facility in the Middle East as well as one of the world's most technically advanced centres in terms of its design. The Air Navigation Centre consists of two main buildings, the Area Control Centre (ACC) and Emergency ACC. It also has four 60 meter masts for communication equipments.[11] In addition to the Abu Dhabi headquarters, the GCAA also has a regional office in Dubai. The facilities of the Dubai offices, established to serve Dubai and the northern emirates, were also constructed after the GCAA was established.
General Civil Aviation Authority 34 Saif Ghobash St - Al Rawdah - W58 - Abu Dhabi
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Sunrise (or sunup) is the moment when the upper rim of the Sun appears on the horizon in the morning,[1] at the start of the Sun path. The term can also refer to the entire process of the solar disk crossing the horizon.
Although the Sun appears to "rise" from the horizon, it is actually the Earth's motion that causes the Sun to appear. The illusion of a moving Sun results from Earth observers being in a rotating reference frame; this apparent motion caused many cultures to have mythologies and religions built around the geocentric model, which prevailed until astronomer Nicolaus Copernicus formulated his heliocentric model in the 16th century.[2]
Architect Buckminster Fuller proposed the terms "sunsight" and "sunclipse" to better represent the heliocentric model, though the terms have not entered into common language.[3][4]
Astronomically, sunrise occurs for only an instant, namely the moment at which the upper limb of the Sun appears tangent to the horizon.[1] However, the term sunrise commonly refers to periods of time both before and after this point:
The stage of sunrise known as false sunrise actually occurs before the Sun truly reaches the horizon because Earth's atmosphere refracts the Sun's image. At the horizon, the average amount of refraction is 34 arcminutes, though this amount varies based on atmospheric conditions.[1]
Also, unlike most other solar measurements, sunrise occurs when the Sun's upper limb, rather than its center, appears to cross the horizon. The apparent radius of the Sun at the horizon is 16 arcminutes.[1]
These two angles combine to define sunrise to occur when the Sun's center is 50 arcminutes below the horizon, or 90.83° from the zenith.[1]
The timing of sunrise varies throughout the year and is also affected by the viewer's latitude and longitude, altitude, and time zone. These changes are driven by the axial tilt of Earth, daily rotation of the Earth, the planet's movement in its annual elliptical orbit around the Sun, and the Earth and Moon's paired revolutions around each other. The analemma can be used to make approximate predictions of the time of sunrise.
In late winter and spring, sunrise as seen from temperate latitudes occurs earlier each day, reaching its earliest time shortly before the summer solstice; although the exact date varies by latitude. After this point, the time of sunrise gets later each day, reaching its latest shortly after the winter solstice, also varying by latitude. The offset between the dates of the solstice and the earliest or latest sunrise time is caused by the eccentricity of Earth's orbit and the tilt of its axis, and is described by the analemma, which can be used to predict the dates.
Variations in atmospheric refraction can alter the time of sunrise by changing its apparent position. Near the poles, the time-of-day variation is extreme, since the Sun crosses the horizon at a very shallow angle and thus rises more slowly.[1]
Accounting for atmospheric refraction and measuring from the leading edge slightly increases the average duration of day relative to night. The sunrise equation, however, which is used to derive the time of sunrise and sunset, uses the Sun's physical center for calculation, neglecting atmospheric refraction and the non-zero angle subtended by the solar disc.
Neglecting the effects of refraction and the Sun's non-zero size, whenever sunrise occurs, in temperate regions it is always in the northeast quadrant from the March equinox to the September equinox and in the southeast quadrant from the September equinox to the March equinox.[6] Sunrises occur approximately due east on the March and September equinoxes for all viewers on Earth.[7] Exact calculations of the azimuths of sunrise on other dates are complex, but they can be estimated with reasonable accuracy by using the analemma.
The figure on the right is calculated using the solar geometry routine in Ref.[8] as follows:
An interesting feature in the figure on the right is apparent hemispheric symmetry in regions where daily sunrise and sunset actually occur.
This symmetry becomes clear if the hemispheric relation in to the sunrise equation is applied to the x- and y-components of the solar vector presented in Ref.[8]
Air molecules and airborne particles scatter white sunlight as it passes through the Earth's atmosphere. This is done by a combination of Rayleigh scattering and Mie scattering.[9]
As a ray of white sunlight travels through the atmosphere to an observer, some of the colors are scattered out of the beam by air molecules and airborne particles, changing the final color of the beam the viewer sees. Because the shorter wavelength components, such as blue and green, scatter more strongly, these colors are preferentially removed from the beam.[9]
At sunrise and sunset, when the path through the atmosphere is longer, the blue and green components are removed almost completely, leaving the longer-wavelength orange and red hues seen at those times. The remaining reddened sunlight can then be scattered by cloud droplets and other relatively large particles to light up the horizon red and orange.[10] The removal of the shorter wavelengths of light is due to Rayleigh scattering by air molecules and particles much smaller than the wavelength of visible light (less than 50 nm in diameter).[11][12] The scattering by cloud droplets and other particles with diameters comparable to or larger than the sunlight's wavelengths (more than 600 nm) is due to Mie scattering and is not strongly wavelength-dependent. Mie scattering is responsible for the light scattered by clouds, and also for the daytime halo of white light around the Sun (forward scattering of white light).[13][14][15]
Sunset colors are typically more brilliant than sunrise colors, because the evening air contains more particles than morning air.[9][10][12][15] Ash from volcanic eruptions, trapped within the troposphere, tends to mute sunset and sunrise colors, while volcanic ejecta that is instead lofted into the stratosphere (as thin clouds of tiny sulfuric acid droplets), can yield beautiful post-sunset colors called afterglows and pre-sunrise glows. A number of eruptions, including those of Mount Pinatubo in 1991 and Krakatoa in 1883, have produced sufficiently high stratospheric sulfuric acid clouds to yield remarkable sunset afterglows (and pre-sunrise glows) around the world. The high altitude clouds serve to reflect strongly reddened sunlight still striking the stratosphere after sunset, down to the surface.
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