Navigation Links
GOCE's electric ion propulsion engine switched on
Date:4/6/2009

GOCE's sophisticated electric ion propulsion system has been switched on and confirmed to be operating normally, marking another crucial milestone in the satellite's post-launch commissioning phase.

The success of GOCE's ultra-sensitive gravity measurements depends on finely controlling the satellite's orbit and speed. The push from the thruster must be just enough to compensate for the tiny amount of drag generated by the few wisps of atmosphere at GOCE's orbital height. No normal jet engine could do this, but GOCE's sophisticated electric ion propulsion system can.

This cutting-edge system does not burn fuel like a regular rocket motor. Instead, it is supplied with xenon from a 40-kg tank, which is converted to fast-moving ions - naked xenon atoms that have had some of their electrons stripped away by an electric discharge generated from solar energy. The ions are ejected toward the rear, giving a very gentle, steady and smooth thrust.

The electric ion propulsion system comprises two redundant thruster units mounted externally on the last panel of the satellite. The thrusters can be throttled between 1 and 20 millinewtons (mN), which will be set automatically, depending on the actual real time drag that the satellite experiences once GOCE is in routine operations.

This is a fantastically small force - a thrust of a few mN is similar to the weight of a few drops of water on Earth. Yet, by thrusting continuously during GOCE's routine operations, it is sufficient to maintain a 'freefall' orbit.

"On Tuesday last week, we fired the B-unit of the electric ion propulsion, stepping it through 1, 3 and 8.3 mNs of thrust. On Thursday, we fired the A-unit. Both are performing nominally," said Spacecraft Operations Manager Juan Pieiro, speaking at, ESA's European Space Operations Centre (ESOC) in Darmstadt, Germany.

"Next comes the 'wake up' for the instruments, which puts us in the position to start operating
'/>"/>

Contact: Robert Meisner
robert.meisner@esa.int
39-069-418-0874
European Space Agency
Source:Eurekalert

Page: 1 2

Related biology news :

1. Clemson physicist addresses international forum on thermoelectric energy
2. Portable electricity, life-like prosthetics on the way
3. CSIC and UAB will build the most advanced superconductor cable for electricity network
4. Penn engineers create carbon nanopipettes that are smaller than cells and measure electric current
5. U of Minnesota researchers discover key for converting waste to electricity
6. Carnegie Mellon researchers urge development of low carbon electricity
7. Cow power could generate electricity for millions
8. Coating improves electrical stimulation therapy used for Parkinsons, depression, chronic pain
9. Greenhouse gas auction revenues can help cut Md. electric use significantly, says study
10. California study shows shade trees reduce summertime electricity use
11. UCLA stem cells scientists make electrically active motor neurons from iPS cells
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:12/19/2014)... Dec. 18, 2014   LaunchKey , the first decentralized ... and Internet of Things era, today announced the close ... round was led by Metamorphic Ventures with participation from ... VegasTechFund, and others.  LaunchKey has raised $4 million to ...
(Date:12/17/2014)... Dec. 16, 2014 Research and Markets ( ... "Global Chemical Sensor Market 2015-2019" report to their ... One major trend upcoming in this market is ... Chemical sensors help in recording of patient data for ...
(Date:12/11/2014)... blood pressure plays a role in human health has been ... for high blood pressure – was first described as a ... used in measuring blood pressure was invented in 1896. ... its triggers and its effects. In fact, recent findings have ...
Breaking Biology News(10 mins):LaunchKey Raises $3 Million in Additional Funding Led by Metamorphic Ventures 2LaunchKey Raises $3 Million in Additional Funding Led by Metamorphic Ventures 3Global Chemical Sensor Market 2015-2019: Key Vendors are Abbott Laboratories, Bayer, Hoffmann La-Roche, Johnson & Johnson, NGK Spark Plugs and Robert Bosch 2Research points to need for new approaches to treatment of high blood pressure 2Research points to need for new approaches to treatment of high blood pressure 3Research points to need for new approaches to treatment of high blood pressure 4
... provoke allergic reactions? A new study in the February ... some of the blame on bioactive molecules that are ... and cause them to launch a typical allergy-promoting immune ... more of these allergy-provoking compounds than do pollen from ...
... can lead to urinary tract infections in women, according ... that UTIs may be caused by ingesting food contaminated ... Gastroenteric Disease Center. Previously, this link was not established, ... University of California-Berkeley, found that E.coli strains isolated from ...
... against insect pests, new research indicates that it may ... group of Rockefeller University scientists who had previously identified ... in fruit flies now shows that this gene's function ... species. , Research by Leslie Vosshall's laboratory had previously ...
Cached Biology News:Bacteria collection sheds light on urinary tract infections 2Ancient olfaction protein is shared by many bugs, offering new pest control target 2
(Date:1/22/2015)... , 22 de enero de 2015  El Dr. ... su llamada a nominaciones para 2015. Este prestigioso premio ... o tiene el potencial para hacer, contribuciones destacadas para ... aceptarán hasta el 15 de marzo de 2015 a ...
(Date:12/25/2014)... 2014 The report “Service Quality Management ... & Provider Type - Global Advancements, Worldwide Forecasts & ... in-depth analysis and forecasting of revenues. , Browse ... pages and in-depth TOC on “Service Quality Management (SQM) ...
(Date:12/24/2014)... 2014 “Preparative & Process Chromatography ... Consumables (Columns, Solvents, Buffers, Valves, Guages, Seals), Accessories, ... - Forecasts to 2019” provides a detailed overview ... market trends, and strategies impacting the preparative and ...
(Date:12/24/2014)... 2014 According to Ross Selinger, President of ... ITRA Global, the national office market continues to be strong, ... is evidenced by the third quarter’s surprising 3.9% GDP, unemployment ... energy costs have held inflation down and the Fed is ...
Breaking Biology Technology:El Dr. Paul Janssen Award for Biomedical Research emite su llamada a los nominados para 2015 2El Dr. Paul Janssen Award for Biomedical Research emite su llamada a los nominados para 2015 3El Dr. Paul Janssen Award for Biomedical Research emite su llamada a los nominados para 2015 4Service Quality Management Market worth $2.1 Billion & Telco Customer Experience Management Market worth $2.3 Billion by 2019 – New Report by MarketsandMarkets 2Service Quality Management Market worth $2.1 Billion & Telco Customer Experience Management Market worth $2.3 Billion by 2019 – New Report by MarketsandMarkets 3Service Quality Management Market worth $2.1 Billion & Telco Customer Experience Management Market worth $2.3 Billion by 2019 – New Report by MarketsandMarkets 4Preparative and Process Chromatography Market is expected to reach $9 billion by 2019 - New Report by Marketsandmarkets 2Preparative and Process Chromatography Market is expected to reach $9 billion by 2019 - New Report by Marketsandmarkets 3Preparative and Process Chromatography Market is expected to reach $9 billion by 2019 - New Report by Marketsandmarkets 4ITRA Global Reports Long Island Is Out of Sync With The National Office Market 2ITRA Global Reports Long Island Is Out of Sync With The National Office Market 3
... to record the electrophysiology of sleep in a wild ... hours per day6 hours less than captive sloths did, ... Smithsonian Tropical Research Institutes Barro Colorado Island in Panama., ... than others. If we can determine the reasons for ...
... Portfolio of Advanced Flow Cytometry Platforms, FRANKLIN LAKES, ... BDX ) announced today that it has acquired ... Washington,corporation based in Seattle that develops and markets advanced ... transaction were not disclosed. The acquisition,is not expected to ...
... Md., May 13 /Xinhua-PRNewswire/ -- Chindex International,Inc. (Nasdaq: ... services and products in the People,s Republic of China,announced ... the,Securities and Exchange Commission (SEC) that, if declared effective ... time to time, up to $100 million,of its common ...
Cached Biology Technology:First electrophysical recording of sleep in a wild animal 2BD Announces Acquisition of Cytopeia 2BD Announces Acquisition of Cytopeia 3Chindex International Announces Shelf Registration, Related Strategy and Guidance 2Chindex International Announces Shelf Registration, Related Strategy and Guidance 3Chindex International Announces Shelf Registration, Related Strategy and Guidance 4Chindex International Announces Shelf Registration, Related Strategy and Guidance 5
... The Luminex 100 IS System is a compact ... that integrates lasers, optics, fluidics, a controller, advanced ... This powerful, compact lab analysis system includes the ... Also, it has a DMF file at the ...
... ideal for routine binary separations. Excellent detection ... 4201 UV-Visible variable wavelength detector. Ultra-fine control ... two highly accurate and precise, high pressure ... pumps., Chromatograms may be plotted on a printer ...
... were cultured in Minimum Essential Medium (Eagle) with ... phase of growth. In order to keep ... fixed in acetone-methanol. The cells are arrayed ... with each wells surface specifically treated to enhance ...
... cultured in RPMI 1640 with 2 mM L-glutamine ... In order to keep the antigens in ... The cells are arrayed on a 12-well ... surface specifically treated to enhance cellular attachment and ...
Biology Products: