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Energy conversion at the Earth's magnetopause using single and multispacecraft methods

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Anekallu, C. R.
dc.contributor.author Palmroth, M.
dc.contributor.author Pulkkinen, Tuija I.
dc.contributor.author Haaland, S. E.
dc.contributor.author Lucek, E.
dc.contributor.author Dandouras, I.
dc.date.accessioned 2015-03-30T09:00:53Z
dc.date.available 2015-03-30T09:00:53Z
dc.date.issued 2011
dc.identifier.citation Anekallu, C. R. & Palmroth, M. & Pulkkinen, Tuija I. & Haaland, S. E. & Lucek, E. & Dandouras, I. 2011. Energy conversion at the Earth's magnetopause using single and multispacecraft methods. Journal of Geophysical Research: Space physics, Vol. 116, nro A11204. P. 16. 2156-2202 (electronic). DOI: 10.1029/2011JA016783 en
dc.identifier.issn 2156-2202 (electronic)
dc.identifier.issn 0148-0227 (printed)
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/15439
dc.description.abstract We present a small statistical data set, where we investigate energy conversion at the magnetopause using Cluster measurements of magnetopause crossings. The Cluster observations of magnetic field, plasma velocity, current density and magnetopause orientation are needed to infer the energy conversion at the magnetopause. These parameters can be inferred either from accurate multispacecraft methods, or by using single-spacecraft methods. Our final aim is a large statistical study, for which only single-spacecraft methods can be applied. The Cluster mission provides an opportunity to examine and validate single-spacecraft methods against the multispacecraft methods. For single-spacecraft methods, we use the Generic Residue Analysis (GRA) and a standard one-dimensional current density method using magnetic field measurements. For multispacecraft methods, we use triangulation (Constant Velocity Approach - CVA) and the curlometer technique. We find that in some cases the single-spacecraft methods yield a different sign for the energy conversion than compared to the multispacecraft methods. These sign ambiguities arise from the orientation of the magnetopause, choosing the interval to be analyzed, large normal current and time offset of the current density inferred from the two methods. By using the Finnish Meteorological Institute global MHD simulation GUMICS-4, we are able to determine which sign is likely to be correct, introducing an opportunity to correct the ambiguous energy conversion values. After correcting the few ambiguous cases, we find that the energy conversion estimated from single-spacecraft methods is generally lower by 70% compared to the multispacecraft methods. en
dc.format.extent 16
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher American Geophysical Union. Wiley en
dc.relation.ispartofseries Journal of Geophysical Research: Space physics, Vol. 116, nro A11204 en
dc.subject.other Space technology en
dc.title Energy conversion at the Earth's magnetopause using single and multispacecraft methods en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.rights.holder American Geophysical Union. Wiley
dc.contributor.school Sähkötekniikan korkeakoulu fi
dc.contributor.school School of Electrical Engineering en
dc.subject.keyword constant velocity approach en
dc.subject.keyword generic residue analysis en
dc.subject.keyword magnetopause energy conversion en
dc.identifier.urn URN:NBN:fi:aalto-201503262098
dc.type.dcmitype text en
dc.identifier.doi 10.1029/2011JA016783
dc.type.version Final published version en

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