Multispacecraft current estimates at swarm

M. W. Dunlop, Y.-Y. Yang, J.-Y. Yang, H. Lühr, C. Shen, N. Olsen, P. Ritter, Q.-H. Zhang, J.-B. Cao, H.-S. Fu, R. Haagmans

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Abstract

During the first several months of the three-spacecraft Swarm mission all three spacecraft camerepeatedly into close alignment, providing an ideal opportunity for validating the proposed dual-spacecraftmethod for estimating current density from the Swarm magnetic field data. Two of the Swarm spacecraftregularly fly side-by-side in closely similar orbits, while the third at times approaches the other two. Thisprovides a data set which under certain assumptions of stationarity of the magnetic field can produce 2, 3, 4,5 (or more) point measurements, which can be cross compared. We find that at low Earth orbit the use oftime-shifted positions allow stable estimates of current density to be made and can verify temporal effects aswell as validating the interpretation of the current components as arising predominantly from field-alignedcurrents. In the case of four-spacecraft configurations we can resolve the full vector current and therefore cancheck the perpendicular as well as parallel current density components directly, together with the qualityfactor for the estimates directly (for the first time in situ at low Earth orbit).
Original languageEnglish
JournalJournal of Geophysical Research: Space Physics
Volume120
Issue number10
Pages (from-to)8308-8316
ISSN2169-9380
DOIs
Publication statusPublished - 2015

Bibliographical note

©2015. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cite this

Dunlop, M. W., Yang, Y-Y., Yang, J-Y., Lühr, H., Shen, C., Olsen, N., ... Haagmans, R. (2015). Multispacecraft current estimates at swarm. Journal of Geophysical Research: Space Physics, 120(10), 8308-8316. https://doi.org/10.1002/2015ja021707
Dunlop, M. W. ; Yang, Y.-Y. ; Yang, J.-Y. ; Lühr, H. ; Shen, C. ; Olsen, N. ; Ritter, P. ; Zhang, Q.-H. ; Cao, J.-B. ; Fu, H.-S. ; Haagmans, R. / Multispacecraft current estimates at swarm. In: Journal of Geophysical Research: Space Physics. 2015 ; Vol. 120, No. 10. pp. 8308-8316.
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abstract = "During the first several months of the three-spacecraft Swarm mission all three spacecraft camerepeatedly into close alignment, providing an ideal opportunity for validating the proposed dual-spacecraftmethod for estimating current density from the Swarm magnetic field data. Two of the Swarm spacecraftregularly fly side-by-side in closely similar orbits, while the third at times approaches the other two. Thisprovides a data set which under certain assumptions of stationarity of the magnetic field can produce 2, 3, 4,5 (or more) point measurements, which can be cross compared. We find that at low Earth orbit the use oftime-shifted positions allow stable estimates of current density to be made and can verify temporal effects aswell as validating the interpretation of the current components as arising predominantly from field-alignedcurrents. In the case of four-spacecraft configurations we can resolve the full vector current and therefore cancheck the perpendicular as well as parallel current density components directly, together with the qualityfactor for the estimates directly (for the first time in situ at low Earth orbit).",
author = "Dunlop, {M. W.} and Y.-Y. Yang and J.-Y. Yang and H. L{\"u}hr and C. Shen and N. Olsen and P. Ritter and Q.-H. Zhang and J.-B. Cao and H.-S. Fu and R. Haagmans",
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Dunlop, MW, Yang, Y-Y, Yang, J-Y, Lühr, H, Shen, C, Olsen, N, Ritter, P, Zhang, Q-H, Cao, J-B, Fu, H-S & Haagmans, R 2015, 'Multispacecraft current estimates at swarm', Journal of Geophysical Research: Space Physics, vol. 120, no. 10, pp. 8308-8316. https://doi.org/10.1002/2015ja021707

Multispacecraft current estimates at swarm. / Dunlop, M. W.; Yang, Y.-Y.; Yang, J.-Y.; Lühr, H.; Shen, C.; Olsen, N.; Ritter, P.; Zhang, Q.-H.; Cao, J.-B.; Fu, H.-S.; Haagmans, R.

In: Journal of Geophysical Research: Space Physics, Vol. 120, No. 10, 2015, p. 8308-8316.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Multispacecraft current estimates at swarm

AU - Dunlop, M. W.

AU - Yang, Y.-Y.

AU - Yang, J.-Y.

AU - Lühr, H.

AU - Shen, C.

AU - Olsen, N.

AU - Ritter, P.

AU - Zhang, Q.-H.

AU - Cao, J.-B.

AU - Fu, H.-S.

AU - Haagmans, R.

N1 - ©2015. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

PY - 2015

Y1 - 2015

N2 - During the first several months of the three-spacecraft Swarm mission all three spacecraft camerepeatedly into close alignment, providing an ideal opportunity for validating the proposed dual-spacecraftmethod for estimating current density from the Swarm magnetic field data. Two of the Swarm spacecraftregularly fly side-by-side in closely similar orbits, while the third at times approaches the other two. Thisprovides a data set which under certain assumptions of stationarity of the magnetic field can produce 2, 3, 4,5 (or more) point measurements, which can be cross compared. We find that at low Earth orbit the use oftime-shifted positions allow stable estimates of current density to be made and can verify temporal effects aswell as validating the interpretation of the current components as arising predominantly from field-alignedcurrents. In the case of four-spacecraft configurations we can resolve the full vector current and therefore cancheck the perpendicular as well as parallel current density components directly, together with the qualityfactor for the estimates directly (for the first time in situ at low Earth orbit).

AB - During the first several months of the three-spacecraft Swarm mission all three spacecraft camerepeatedly into close alignment, providing an ideal opportunity for validating the proposed dual-spacecraftmethod for estimating current density from the Swarm magnetic field data. Two of the Swarm spacecraftregularly fly side-by-side in closely similar orbits, while the third at times approaches the other two. Thisprovides a data set which under certain assumptions of stationarity of the magnetic field can produce 2, 3, 4,5 (or more) point measurements, which can be cross compared. We find that at low Earth orbit the use oftime-shifted positions allow stable estimates of current density to be made and can verify temporal effects aswell as validating the interpretation of the current components as arising predominantly from field-alignedcurrents. In the case of four-spacecraft configurations we can resolve the full vector current and therefore cancheck the perpendicular as well as parallel current density components directly, together with the qualityfactor for the estimates directly (for the first time in situ at low Earth orbit).

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DO - 10.1002/2015ja021707

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VL - 120

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EP - 8316

JO - Journal of Geophysical Research

JF - Journal of Geophysical Research

SN - 0148-0227

IS - 10

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