The Swarm Satellite Constellation Application and Research Facility (SCARF) and Swarm data products

Olsen, Nils; Friis‐Christensen, E.; Floberghagen, Rune; Alken, Patrick; Beggan, Ciarán; Chulliat, Arnaud; Doornbos, Eelco; Encarnação, J.; Hamilton, Brian; Hulot, Gauthier; IJssel, José van den; Kuvshinov, Alexey; Lesur, Vincent; Lühr, H.; Macmillan, Susan; Maus, Stefan; Noja, Max; Olsen, Poul Erik; Park, Jaeheung; Plank, Gernot; Püthe, Christoph; Rauberg, Jan; Ritter, Patricia; Rother, M.; Sabaka, Terence J.; Schachtschneider, Reyko; Sirol, Olivier; Stolle, Claudia; Thébault, Erwan; Thomson, Alan; Tøffner-Clausen, Lars; Velı́mský, Jakub; Vigneron, P.; Visser, Pieter

doi:10.5047/eps.2013.07.001

Cited by 255 publications

(202 citation statements)

References 26 publications

Supporting

Mentioning

186

Contrasting

Unclassified

Order By: Relevance

“…A similar algorithm using only data from Swarm was used by GFZ to produce the Swarm Level 2 Data Product: Dedicated Inversion [38]. For both models we used the SV to degree 14.…”

Section: Robustness Of Jet Accelerationmentioning

confidence: 99%

See 1 more Smart Citation

An accelerating high-latitude jet in Earth’s core

2016

View full text Add to dashboard Cite

Observations of the change in Earth's magnetic field, the secular variation, provide information on the motion of liquid metal within the core that is responsible for its generation. The very latest high-resolution observations from ESA's Swarm satellite mission show intense field change at high-latitude localised in a distinctive circular daisy-chain configuration centred on the north geographic pole. Here we explain this feature with a localised, non-axisymmetric, westwards jet of 420 km width on the tangent cylinder, the cylinder of fluid within the core that is aligned with the rotation axis and tangent to the solid inner core.We find that the jet has increased in magnitude by a factor of three over the period 2000-2016 to about 40 km/yr, and is now much stronger than typical large-scale flows inferred for the core. The current accelerating phase may be a part of a longer term fluctuation of the jet causing both eastwards and westwards movement of magnetic features over historical

show abstract

“…A similar algorithm using only data from Swarm was used by GFZ to produce the Swarm Level 2 Data Product: Dedicated Inversion [38]. For both models we used the SV to degree 14.…”

Section: Robustness Of Jet Accelerationmentioning

confidence: 99%

“…The Swarm Level 2 Data Product: Comprehensive Inversion (CI) [38] has been produced using a similar method but using only Swarm data. For both models we used the SV to degree 13.…”

Section: Robustness Of Jet Accelerationmentioning

confidence: 99%

An accelerating high-latitude jet in Earth’s core

2016

View full text Add to dashboard Cite

show abstract

“…We first search for the orientation of the current sheet with respect to the satellite track by performing an minimum variance analysis (MVA) on the 1 Hz resolution magnetic field measured by the Vector Field Magnetometer (VFM) on board the three Swarm spacecraft (Figures 2a and 2b). (For more information about Swarm data products, the reader may refer to Olsen et al [2013]). Then, once the relative orientation is known, we are able to take into account the correct horizontal magnetic field to estimate the curl of B and thus the FAC density [Marchaudon et al, 2006].…”

Section: /2015gl064231mentioning

confidence: 99%

Swarm and ESR observations of the ionospheric response to a field‐aligned current system in the high‐latitude midnight sector

Pitout

Marchaudon

Blelly

et al. 2015

Geophysical Research Letters

View full text Add to dashboard Cite

We present a conjunction between the Swarm fleet and the European Incoherent Scatter Svalbard Radar (ESR) on 9 January 2014. The Swarm orbit in the early phase of the mission gives us the unique opportunity of sequencing the temporal evolution of the observed field‐aligned current system in the nightside, near magnetic local midnight. These field‐aligned currents are seen to move poleward through the radar field of view and to affect the observed ionosphere. The upward field‐aligned current (FAC) is responsible, at least in part, for the heating of the ionospheric electrons. It is less clear whether the downward FAC cools the ionosphere. We use the TRANSCAR model of the ionosphere to quantify the thermoelectric effect that comes into play. Finally, we compare the plasma parameters measured by the Langmuir probe on board Swarm and the ESR and conclude on an agreement within the errors.

show abstract

“…MMA is the a time series of spherical harmonic model coefficients of the large-scale magnetospheric field and its Earth-induced counterparts (Hamilton, 2013); AUX DST is the name of a Swarm L2 Product with DST indices including quick-look and preliminary estimates from World Data Center for Geomagnetism in Kyoto, in listing format (Olsen et al, 2013); AUX IMF is the name of a Swarm L2 Product with the values of the Interplanetary Magnetic Field propagated to the Earth magnetosphere (Olsen et al, 2013).…”

Section: Selectionmentioning

confidence: 99%

“…To help with the successful exploitation of the expected Swarm data, ESA has supported a processing environment to create so-called Level 2 products (Olsen et al, 2013). The aim is to provide the scientific community with stateof-the-art models of the known different contributions to the magnetic field.…”

Section: Introductionmentioning

confidence: 99%

An algorithm for deriving core magnetic field models from the Swarm data set

2013

Self Cite

View full text Add to dashboard Cite

In view of an optimal exploitation of the Swarm data set, we have prepared and tested software dedicated to the determination of accurate core magnetic field models and of the Euler angles between the magnetic sensors and the satellite reference frame. The dedicated core field model estimation is derived directly from the GFZ Reference Internal Magnetic Model (GRIMM) inversion and modeling family. The data selection techniques and the model parameterizations are similar to what were used for the derivation of the second (Lesur et al., 2010) and third versions of GRIMM, although the usage of observatory data is not planned in the framework of the application to Swarm. The regularization technique applied during the inversion process smoothes the magnetic field model in time. The algorithm to estimate the Euler angles is also derived from the CHAMP studies. The inversion scheme includes Euler angle determination with a quaternion representation for describing the rotations. It has been built to handle possible weak time variations of these angles. The modeling approach and software have been initially validated on a simple, noise-free, synthetic data set and on CHAMP vector magnetic field measurements. We present results of test runs applied to the synthetic Swarm test data set.

show abstract

The Swarm Satellite Constellation Application and Research Facility (SCARF) and Swarm data products

Cited by 255 publications

References 26 publications

An accelerating high-latitude jet in Earth’s core

An accelerating high-latitude jet in Earth’s core

Swarm and ESR observations of the ionospheric response to a field‐aligned current system in the high‐latitude midnight sector

An algorithm for deriving core magnetic field models from the Swarm data set

Contact Info

Product

Resources

About