Cluster observations of bounday layer structure and a flux transfer event near the cusp

Fear, R. C.; Fazakerley, A. N.; Owen, C. J.; Lahiff, A. D.; Lucek, E.; Balogh, A.; Kistler, L. M.; Mouikis, C.; Rème, H.

doi:10.5194/angeo-23-2605-2005

Cited by 11 publications

(18 citation statements)

References 39 publications

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“…Cluster data from the same period of time that is presented here have previously been analysed by Fear et al 2 . In their interpretation, the spacecraft approached a smooth gradient intermittently, due to oscillations in the magnetopause position.…”

Section: Conclusion and Discussionmentioning

confidence: 85%

“…The vectorv tan is defined in Eq. (2). The left hand panel shows the distribution function at 10:21:11, when the spacecraft was located inside the magnetosphere and a large inward flux was measured, as is seen in Fig.…”

Section: Particle Flux Across the Magnetopausementioning

confidence: 99%

“…Data from this magnetopause crossing has been analysed before by Fear et al 2 . Those authors considered the several spacecraft one by one and a) Electronic mail: herbert.gunell@physics.org came to the conclusion that the spacecraft approached the boundary intermittently due to oscillations in the magnetopause position.…”

Section: Introductionmentioning

confidence: 99%

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Plasma penetration of the dayside magnetopause

et al. 2012

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Data from the Cluster spacecraft during their magnetopause crossing on 25 January 2002 are presented. The magnetopause was in a state of slow non-oscillatory motion during the observational period. Coherent structures of magnetosheath plasma, here typified as plasmoids, were seen on closed magnetic field lines on the inside of the magnetopause. Using simultaneous measurements on two spacecraft the inward motion of the plasmoids is followed from one spacecraft to the next, and it is found to be in agreement with the measured ion velocity. The plasma characteristics and the direction of motion of the plasmoids show that they have penetrated the magnetopause, and the observations are consistent with the concept of impulsive penetration, as it is known from theory, simulations, and laboratory experiments. The mean flux across the magnetopause observed was 0.2-0.5% of the solar wind flux at the time, and the peak values of the flux inside the plasmoids reached approximately 20% of the solar wind flux.

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Section: Conclusion and Discussionmentioning

confidence: 85%

Section: Particle Flux Across the Magnetopausementioning

confidence: 99%

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Plasma penetration of the dayside magnetopause

et al. 2012

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“…Wang et al (2005) suggested that this was because FTEs were more likely to extend further out into the magnetosheath than they extend into the magnetosphere; recent analysis of some individual FTEs observed by Cluster has confirmed that this may be the case (Hasegawa et al, 2006). However, a further possible explanation is that the magnetospheric signatures of FTEs at high latitudes, particularly in the vicinity of the cusp, may often be more complicated than low latitude signatures, possibly leading to an underestimate of the number of magnetospheric events (Thompson et al, 2004;Fear et al, 2005a).…”

Section: Introductionmentioning

confidence: 99%

Motion of flux transfer events: a test of the Cooling model

et al. 2007

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Abstract. The simple model of reconnected field line motion developed by Cooling et al. (2001) has been used in several recent case studies to explain the motion of flux transfer events across the magnetopause. We examine 213 FTEs observed by all four Cluster spacecraft under a variety of IMF conditions between November 2002 and June 2003, when the spacecraft tetrahedron separation was ∼5000 km. Observed velocities were calculated from multi-spacecraft timing analysis, and compared with the velocities predicted by the Cooling model in order to check the validity of the model. After excluding three categories of FTEs (events with poorly defined velocities, a significant velocity component out of the magnetopause surface, or a scale size of less than 5000 km), we were left with a sample of 118 events. 78% of these events were consistent in both direction of motion and speed with one of the two model de Hoffmann-Teller (dHT) velocities calculated from the Cooling model (to within 30 • and a factor of two in the speed). We also examined the plasma signatures of several magnetosheath FTEs; the electron signatures confirm the hemisphere of connection indicated by the model in most cases. This indicates that although the model is a simple one, it is a useful tool for identifying the source regions of FTEs.

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“…Recently, Cluster (Escoubet et al, 1997) observations of FTEs (e.g. Owen et al, 2001;Fear et al, 2005;Zheng et al, 2005;Hasegawa et al, 2006) have been combined with a variety of groundbased instruments (e.g. Lockwood et al, 2001;Wild et al, 2001Wild et al, , 2003Wild et al, , 2007Marchaudon et al, 2004), and with other spacecraft located at the magnetopause (Dunlop et al, 2005).…”

Section: Q-h Zhang Et Al: Cluster and Conjugate Superdarn Observatmentioning

confidence: 99%

Simultaneous tracking of reconnected flux tubes: Cluster and conjugate SuperDARN observations on 1 April 2004

et al. 2008

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Abstract. While the Cluster spacecraft were located near the high-latitude magnetopause, between 11:30-13:00 UT on 1 April 2004, a series of medium to large scale (40 nT, 0.6-1.2 Re) FTEs were observed. During this pass, simultaneous and conjugated SuperDARN measurements are available that show a global flow pattern which is consistent with the expected (mapped) north-west motion of (predominantly subsolar) reconnected, magnetic flux at the magnetopause. We focus on analysing the local response of three FTEs, tracking their magnetopause motion via the four-spacecraft measurements together with their corresponding ground mapped motions. For two of these FTEs, where the tracking is strongly coordinated with the ionospheric flow at each footprint of the implied flux tubes in the Northern Hemisphere, conditions corresponded to stable, increasing (>100 • ) clock angle, while the third event, where the correspondence is less strong, coincided with low (<100 • ) clock angle. Flux tube motion, both measured and modeled from the inferred Xline, qualitatively matches the clear velocity enhancements in ionospheric convections with northward and westward flow at each location in the Northern Hemisphere, measured simultaneously by SuperDARN, and also roughly matches the observed, south-eastward ionospheric flow in the Southern Hemisphere at the time of these events. The time periods of these velocity enhancements infer that the evolution time of the FTEs is about 4-6 min from its origin on magnetopause to its addition to the polar cap. However, the ionospheric response time in the Southern Hemisphere might be Correspondence to: Q.-H. Zhang (zhangqinghe@pric.gov.cn) 2 min longer for the 12:31 UT FTE (and 6 min longer for the 12:51 UT FTE) than the response time in the Northern Hemisphere.

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Cluster observations of bounday layer structure and a flux transfer event near the cusp

Cited by 11 publications

References 39 publications

Plasma penetration of the dayside magnetopause

Plasma penetration of the dayside magnetopause

Motion of flux transfer events: a test of the Cooling model

Simultaneous tracking of reconnected flux tubes: Cluster and conjugate SuperDARN observations on 1 April 2004

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