Meteosat
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The Meteosat series of satellites are geostationary meteorological satellites operated by EUMETSAT under the Meteosat Transition Programme (MTP).
The program was established to ensure the operational continuity between the end of the successful Meteosat Operational Programme in 1995 and Meteosat Second Generation (MSG), which came into operation at the start of 2004 using improved satellites. The MTP provides an overlap with MSG by continuing the current Meteosat system until at least the end of the year 2005.
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[edit] First generation
The first generation of Meteosat satellites, Meteosat-1 to Meteosat-7, provide continuous and reliable meteorological observations from space to a large user community. In addition to the provision of images of the Earth and its atmosphere every half-hour in three spectral channels (Visible, Infrared) and Water Vapour, via the Meteosat Visible and Infrared Imager (MVIRI) instrument, a range of processed meteorological products is produced. Meteosat also supports the retransmission of data from data collection platforms in remote locations, at sea and on board aircraft, as well as the dissemination of meteorological information in graphical and text formats.
The satellites were manufactured by a consortium COSMOS, with Aerospatiale in its Cannes Mandelieu Space Center, as Prime, and included Matra, MBB, Selenia Spazio, Marconi Company.
They are 2.1 metres in diameter and 3.195 metres long. Its initial mass in orbit is 282 kg, and in orbit, the satellite spins at 100 rpm around its main axis [1]
[edit] Meteosat Second Generation
The contract for the second generation was awarded to Aerospatiale in its Cannes Mandelieu Space Center (now Thales Alenia Space), with main subcontractors as Matra, Messerschmitt, Alenia.
Meteosat Second Generation was designed in response to user requirements to serve the needs of Nowcasting applications and Numerical Weather Prediction. In addition the GERB instrument provides important data for climate monitoring and research.
The new satellites are spin-stabilised like the previous generation, but with many design improvements. The more frequent and comprehensive data collected by MSG also aids the weather forecaster in the swift recognition and prediction of dangerous weather phenomena such as thunderstorms, fog and explosive development of small but intense depressions which can lead to devastating wind storms.
The MSG satellites are 3.2 m in diameter and 2.4 m high and spins anti-clockwise at 100 RPM[2] at an altitude of 36,000 km[3].
On January 29, 2004 the first Meteosat Second Generation satellite MSG-1, renamed to Meteosat-8, commenced routine operations. In addition to GERB, Meteosat-8 also carries the Spinning Enhanced Visible and Infrared Imager (SEVIRI) instrument.
The launch of Meteosat-9 took place on December 21, 2005.
At the end of June 2007 Meteosat-6, -7, -8 and -9 were all operational. Meteosat-6 and -7 were stationed over the Indian Ocean. Meteosat-8, and -9 were all located over Africa with various differences in operational configuration; Meteosat-6 provided a DCP service and was a backup to Meteosat-7, Meteosat-7 provides the primary imagery coverage over the Indian Ocean, Meteosat-8 was a backup to Meteosat-9 (and Metoesat-8 is also conducting trials of a potential future European 'rapid scan' mode service for the second quarter of 2008 (with images of Europe every 5 minutes)) and Meteosat-9 provides the main imagery service over Europe and Africa.
[edit] Secondary Payloads
MSG-2 carries a Search and Rescue signal Processor (SARP) that detects 406 MHz distress signals from distress radiobeacons. See more under Cospas-Sarsat.
[edit] Space Debris Impact
On Tuesday 22 May 2007 Meteosat-8 experienced a sudden orbit change of about 180 metres which was not the result of a commanded manoeuvre. Extensive investigations by EUMETSAT concluded that this occurred as a result of a collision with either an uncatalogued piece of space-debris or a micro-meteorite. Although there seems to have been some structural damage the imaging system of the satellite appears not to have been affected by the incident and it continues to downlink data as normal.
[edit] See also
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[edit] References
- EUMETSAT
- Perfect day for weather satellite. BBC News (2005). Retrieved on February 6, 2006.
- Update on Meteosat-8 Debris impact. EUMETSAT (2007). Retrieved on August 21, 2007.
Krige, John. "Crossing the Interface from R&D to Operational Use: The Case of the European Meteorological Satellite,” Technology and Culture, Volume 41, Number 1, January 2000, pp. 27-50.
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