Westward tilt of low-latitude plasma blobs as observed by the Swarm constellation

Jaeheung Park, Hermann Luehr, Ingo Michaelis, Claudia Stolle, Jan Rauberg, Stephan Buchert, Reine Gill, José M.G. Merayo, Peter Brauer

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

In this study we investigate the three-dimensional structure of low-latitude plasma blobs using multi-instrument and multisatellite observations of the Swarm constellation. During the early commissioning phase the Swarm satellites were flying at the same altitude with zonal separation of about 0.5 degrees in geographic longitude. Electron density data from the three satellites constrain the blob morphology projected onto the horizontal plane. Magnetic field deflections around blobs, which originate from field-aligned currents near the irregularity boundaries, constrain the blob structure projected onto the plane perpendicular to the ambient magnetic field. As the two constraints are given for two noncoplanar surfaces, we can get information on the three-dimensional structure of blobs. Combined observation results suggest that blobs are contained within tilted shells of geomagnetic flux tubes, which are similar to the shell structure of equatorial plasma bubbles suggested by previous studies.
Original languageEnglish
JournalJournal of Geophysical Research: Space Physics
Volume120
Issue number4
Pages (from-to)3187-3197
ISSN2169-9380
DOIs
Publication statusPublished - 2015

Cite this

Park, Jaeheung ; Luehr, Hermann ; Michaelis, Ingo ; Stolle, Claudia ; Rauberg, Jan ; Buchert, Stephan ; Gill, Reine ; Merayo, José M.G. ; Brauer, Peter. / Westward tilt of low-latitude plasma blobs as observed by the Swarm constellation. In: Journal of Geophysical Research: Space Physics. 2015 ; Vol. 120, No. 4. pp. 3187-3197.
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title = "Westward tilt of low-latitude plasma blobs as observed by the Swarm constellation",
abstract = "In this study we investigate the three-dimensional structure of low-latitude plasma blobs using multi-instrument and multisatellite observations of the Swarm constellation. During the early commissioning phase the Swarm satellites were flying at the same altitude with zonal separation of about 0.5 degrees in geographic longitude. Electron density data from the three satellites constrain the blob morphology projected onto the horizontal plane. Magnetic field deflections around blobs, which originate from field-aligned currents near the irregularity boundaries, constrain the blob structure projected onto the plane perpendicular to the ambient magnetic field. As the two constraints are given for two noncoplanar surfaces, we can get information on the three-dimensional structure of blobs. Combined observation results suggest that blobs are contained within tilted shells of geomagnetic flux tubes, which are similar to the shell structure of equatorial plasma bubbles suggested by previous studies.",
author = "Jaeheung Park and Hermann Luehr and Ingo Michaelis and Claudia Stolle and Jan Rauberg and Stephan Buchert and Reine Gill and Merayo, {Jos{\'e} M.G.} and Peter Brauer",
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Westward tilt of low-latitude plasma blobs as observed by the Swarm constellation. / Park, Jaeheung; Luehr, Hermann; Michaelis, Ingo; Stolle, Claudia; Rauberg, Jan; Buchert, Stephan; Gill, Reine; Merayo, José M.G.; Brauer, Peter.

In: Journal of Geophysical Research: Space Physics, Vol. 120, No. 4, 2015, p. 3187-3197.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Westward tilt of low-latitude plasma blobs as observed by the Swarm constellation

AU - Park, Jaeheung

AU - Luehr, Hermann

AU - Michaelis, Ingo

AU - Stolle, Claudia

AU - Rauberg, Jan

AU - Buchert, Stephan

AU - Gill, Reine

AU - Merayo, José M.G.

AU - Brauer, Peter

PY - 2015

Y1 - 2015

N2 - In this study we investigate the three-dimensional structure of low-latitude plasma blobs using multi-instrument and multisatellite observations of the Swarm constellation. During the early commissioning phase the Swarm satellites were flying at the same altitude with zonal separation of about 0.5 degrees in geographic longitude. Electron density data from the three satellites constrain the blob morphology projected onto the horizontal plane. Magnetic field deflections around blobs, which originate from field-aligned currents near the irregularity boundaries, constrain the blob structure projected onto the plane perpendicular to the ambient magnetic field. As the two constraints are given for two noncoplanar surfaces, we can get information on the three-dimensional structure of blobs. Combined observation results suggest that blobs are contained within tilted shells of geomagnetic flux tubes, which are similar to the shell structure of equatorial plasma bubbles suggested by previous studies.

AB - In this study we investigate the three-dimensional structure of low-latitude plasma blobs using multi-instrument and multisatellite observations of the Swarm constellation. During the early commissioning phase the Swarm satellites were flying at the same altitude with zonal separation of about 0.5 degrees in geographic longitude. Electron density data from the three satellites constrain the blob morphology projected onto the horizontal plane. Magnetic field deflections around blobs, which originate from field-aligned currents near the irregularity boundaries, constrain the blob structure projected onto the plane perpendicular to the ambient magnetic field. As the two constraints are given for two noncoplanar surfaces, we can get information on the three-dimensional structure of blobs. Combined observation results suggest that blobs are contained within tilted shells of geomagnetic flux tubes, which are similar to the shell structure of equatorial plasma bubbles suggested by previous studies.

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