VII: CLOSING SESSION: GOCE: ESA's First Earth Explorer Core Mission

Drinkwater, Mark R.; Floberghagen, Rune; Haagmans, Roger; Muzi, D.; Popescu, Alexandru

doi:10.1023/a:1026104216284

Cited by 128 publications

(64 citation statements)

References 4 publications

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“…Explorer (Drinkwater et al, 2003), was launched on 17 March 2009 and reentered the atmosphere on 11 November 2013. The…”

Section: Gravity Field Solutionsmentioning

confidence: 99%

Crustal Thickness of Antarctica estimated using data from gravimetric satellites

Llubes¹,

Seoane²,

Bruinsma³

et al. 2017

Preprint

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Abstract. Computing a better crustal thickness model is still a necessary improvement in Antarctica. In this far continentwhere almost all the rocky surface is covered by the ice sheet, seismic investigations do not reach a sufficient spatial resolution 10 for geological and geophysical purposes. Here, we computed a global map of Antarctic crustal thicknesses based on space gravity observations. The DIR5 gravity field model, built from GOCE and also GRACE gravimetric data, is inverted with the Parker-Oldenburg's iterative algorithm. The BEDMAP products are used to estimate the gravity effect of the ice and the rocky surface. Our result is compared to crustal thickness provided by seismological studies, CRUST1.0 and AN1 models. Although CRUST1.0 shows a very good agreement with our model, the spatial resolution is smaller with gravimetric data. Finally, we 15 adjust the crust/mantle density contrast considering the Moho depth from CRUST1.0 model. In East Antarctica, the density contrast clearly shows higher values than in West Antarctica.

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“…Explorer (Drinkwater et al, 2003), was launched on 17 March 2009 and reentered the atmosphere on 11 November 2013. The…”

Section: Gravity Field Solutionsmentioning

confidence: 99%

Crustal Thickness of Antarctica estimated using data from gravimetric satellites

Llubes¹,

Seoane²,

Bruinsma³

et al. 2017

Preprint

View full text Add to dashboard Cite

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“…This assumes negligible spacecraft jitter and that no other noise sources (phase-meter noise, sideband noise, thermal noise) limit the sensitivity, which at this frequency band would behave differently than in the LISA band. In fact, the GOCE mission [26] has already demonstrated such acceleration noise levels at mHz frequencies [27], and therefore this seems a rather modest requirement at OGO frequencies. We therefore see that such a short-arm-length OGO would actually only be a more complicated alternative to other feasible mission designs.…”

Section: General Performance Of the Dfi Schemementioning

confidence: 99%

Octahedron configuration for a displacement noise-cancelling gravitational wave detector in space

Wang

Keitel²,

Babak³

et al. 2013

Phys. Rev. D

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We study for the first time a three-dimensional octahedron constellation for a space-based gravitational wave detector, which we call the Octahedral Gravitational Observatory (OGO). With six spacecraft the constellation is able to remove laser frequency noise and acceleration disturbances from the gravitational wave signal without needing LISA-like drag-free control, thereby simplifying the payloads and placing less stringent demands on the thrusters. We generalize LISA's time-delay interferometry to displacement-noise free interferometry (DFI) by deriving a set of generators for those combinations of the data streams that cancel laser and acceleration noise. However, the threedimensional configuration makes orbit selection complicated. So far, only a halo orbit near the Lagrangian point L1 has been found to be stable enough, and this allows only short arms up to 1400 km. We derive the sensitivity curve of OGO with this arm length, resulting in a peak sensitivity of about 2×10−23 Hz −1/2 near 100 Hz. We compare this version of OGO to the present generation of ground-based detectors and to some future detectors. We also investigate the scientific potentials of such a detector, which include observing gravitational waves from compact binary coalescences, the stochastic background and pulsars as well as the possibility to test alternative theories of gravity. We find a mediocre performance level for this short-arm-length detector, between those of initial and advanced ground-based detectors. Thus, actually building a space-based detector of this specific configuration does not seem very efficient. However, when alternative orbits that allow for longer detector arms can be found, a detector with much improved science output could be constructed using the octahedron configuration and DFI solutions demonstrated in this paper. Also, since the sensitivity of a DFI detector is limited mainly by shot noise, we discuss how the overall sensitivity could be improved by using advanced technologies that reduce this particular noise source.

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“…Precise measurement of inertial (non-gravitational) acceleration is vital to many spaceborne science missions, including satellite geodesy (Reigber 2002;Tapley 2004;Drinkwater 2003), fundamental physics experiments (Touboul 2001;Everitt 2011) and gravitational wave observation (Danzmann 2003). The most precise accelerometers manufactured to date are the electrostatic accelerometers (EA) produced by ONERA, which are capable of measuring spacecraft non-gravitational acceleration to ∼10 −11 m s −2 Hz −1/2 from roughly 1 mHz to 1 Hz (Touboul 2012).…”

Section: Introductionmentioning

confidence: 99%

“…The most precise accelerometers manufactured to date are the electrostatic accelerometers (EA) produced by ONERA, which are capable of measuring spacecraft non-gravitational acceleration to ∼10 −11 m s −2 Hz −1/2 from roughly 1 mHz to 1 Hz (Touboul 2012). These accelerometers have been recently used for low-low satellite-to-satellite tracking missions including GRACE (Tapley 2004) and for the gravity gradiometer mission, GOCE (Drinkwater 2003).…”

Section: Introductionmentioning

confidence: 99%

“…The spacecraft acceleration measurement is still limited by voltage reference stability, but the nominal voltage applied to the housing electrodes to keep the test mass centered is reduced, and therefore the electrostatic force noise is also reduced. Both the Gravity Probe B (Everitt 2011) and GOCE (Drinkwater 2003) missions are operated in accelerometer-mode drag-free. Using this approach, Gravity Probe B reduced the electrostatic suspension force noise to an equivalent acceleration of 4 × 10 −11 m/s 2 Hz 1/2 Bencze (2006) and GOCE achieved a differential acceleration noise between test masses of ∼ 10 −12 m s −2 Hz −1/2 in the 1 mHz to 1 Hz frequency band (Christophe 2010).…”

Section: Introductionmentioning

confidence: 99%

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Drift mode accelerometry for spaceborne gravity measurements

Conklin

2015

J Geod

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A drift mode accelerometer is a precision instrument for spacecraft that overcomes much of the acceleration noise and readout dynamic range limitations of traditional electrostatic accelerometers. It has the potential of achieving acceleration noise performance similar to that of dragfree systems over a restricted frequency band without the need for external drag-free control or continuous spacecraft propulsion. Like traditional accelerometers, the drift mode accelerometer contains a high-density test mass surrounded by an electrode housing, which can control and sense all six degrees of freedom of the test mass. Unlike traditional accelerometers, the suspension system is operated with a low duty cycle so that the limiting suspension force noise only acts over brief, known time intervals, which can be neglected in the data analysis. The readout is performed using a laser interferometer which is immune to the dynamic range limitations of even the best voltage references typically used to determine the inertial acceleration of electrostatic accelerometers. The drift mode accelerometer is a novel offshoot of the like-named operational mode of the LISA Pathfinder spacecraft, in which its test mass suspension system is cycled on and off to estimate the acceleration noise associated with the front-end electronics. This paper presents the concept of a drift mode accelerometer, describes the operation of such a device, develops models for its performance with respect to non-drag-free satellite geodesy and gravitational wave missions, and discusses plans for testing the performance of a prototype sensor in the laboratory using torsion pendula.

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VII: CLOSING SESSION: GOCE: ESA's First Earth Explorer Core Mission

Cited by 128 publications

References 4 publications

Crustal Thickness of Antarctica estimated using data from gravimetric satellites

Crustal Thickness of Antarctica estimated using data from gravimetric satellites

Octahedron configuration for a displacement noise-cancelling gravitational wave detector in space

Drift mode accelerometry for spaceborne gravity measurements

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