Cluster magnetotail observations of a tailward-travelling plasmoid at substorm expansion phase onset and field aligned currents in the plasma sheet boundary layer

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Cluster magnetotail observations of a tailward-travelling plasmoid at substorm expansion phase onset and field aligned currents in the plasma sheet boundary layer. / Draper, N. C.; Lester, M.; Cowley, S. W. H. et al.
In: Annales Geophysicae, Vol. 23, No. 12, 12.2005, p. 3667-3683.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Draper, NC, Lester, M, Cowley, SWH, Wild, JA, Milan, SE, Provan, G, Grocott, A, Fazakerley, AN, Lahiff, A, Davies, JA, Bosqued, JM, Dewhurst, JP, Nakamura, R, Owen, CJ, Watermann, JF, Henderson, MG, Singer, HJ & Donovan, E 2005, 'Cluster magnetotail observations of a tailward-travelling plasmoid at substorm expansion phase onset and field aligned currents in the plasma sheet boundary layer', Annales Geophysicae, vol. 23, no. 12, pp. 3667-3683. https://doi.org/10.5194/angeo-23-3667-2005

APA

Draper, N. C., Lester, M., Cowley, S. W. H., Wild, J. A., Milan, S. E., Provan, G., Grocott, A., Fazakerley, A. N., Lahiff, A., Davies, J. A., Bosqued, J. M., Dewhurst, J. P., Nakamura, R., Owen, C. J., Watermann, J. F., Henderson, M. G., Singer, H. J., & Donovan, E. (2005). Cluster magnetotail observations of a tailward-travelling plasmoid at substorm expansion phase onset and field aligned currents in the plasma sheet boundary layer. Annales Geophysicae, 23(12), 3667-3683. https://doi.org/10.5194/angeo-23-3667-2005

Vancouver

Draper NC, Lester M, Cowley SWH, Wild JA, Milan SE, Provan G et al. Cluster magnetotail observations of a tailward-travelling plasmoid at substorm expansion phase onset and field aligned currents in the plasma sheet boundary layer. Annales Geophysicae. 2005 Dec;23(12):3667-3683. doi: 10.5194/angeo-23-3667-2005

Author

Draper, N. C. ; Lester, M. ; Cowley, S. W. H. et al. / Cluster magnetotail observations of a tailward-travelling plasmoid at substorm expansion phase onset and field aligned currents in the plasma sheet boundary layer. In: Annales Geophysicae. 2005 ; Vol. 23, No. 12. pp. 3667-3683.

Bibtex

@article{db3ffaa0e85f42ee9897b12707dbbbac,

title = "Cluster magnetotail observations of a tailward-travelling plasmoid at substorm expansion phase onset and field aligned currents in the plasma sheet boundary layer",

abstract = "We present data from both ground- and space- based instruments for a substorm event which occurred on 5 October 2002, with an expansion phase onset time of 02:50 UT determined from the ground magnetometer data. During this substorm, the Cluster spacecraft were located around 15 RE downtail, 8 RE from midnight in the pre- midnight sector and just 2 RE above the equatorial plane (in GSM coordinates). At expansion phase onset the Cluster spacecraft were located in the plasma sheet, tailward of a near-Earth neutral line and detected a significant time delay of 6 min between the tail field Bz component becoming negative and the subsequent detection of Earthward flows. This is explained by the formation of a tailward-directed travel- ling compression region initially Earthward of the spacecraft; 7 min later the Cluster spacecraft entered the plasma sheet boundary layer; they remained in and close to the plasma sheet boundary layer for around 15 min before exiting to the lobe. The spacecraft then re-entered the plasma sheet 30 min after onset. Earthward then tailward directed currents detected in the plasma sheet boundary layer after onset indicate that the Cluster spacecraft encountered the dawnward and duskward portions of the reconnection flow associated current system with Region 1 sense, respectively. The reconnection site and current system were initially skewed towards the pre-midnight sector, consistent with previous observations that found the majority of substorm onsets located in this sector. At later times the reconnection site and current system had moved towards dawn, to be located more centrally in the midnight sector.",

author = "Draper, {N. C.} and M. Lester and Cowley, {S. W. H.} and Wild, {J. A.} and Milan, {S. E.} and G. Provan and A. Grocott and Fazakerley, {A. N.} and A. Lahiff and Davies, {J. A.} and Bosqued, {J. M.} and Dewhurst, {J. P.} and R. Nakamura and Owen, {C. J.} and Watermann, {J. F.} and Henderson, {M. G.} and Singer, {H. J.} and E. Donovan",

note = "{\textcopyright} European Geosciences Union 2005",

year = "2005",

month = dec,

doi = "10.5194/angeo-23-3667-2005",

language = "English",

volume = "23",

pages = "3667--3683",

journal = "Annales Geophysicae",

issn = "0992-7689",

publisher = "European Geosciences Union",

number = "12",

}

RIS

TY - JOUR

T1 - Cluster magnetotail observations of a tailward-travelling plasmoid at substorm expansion phase onset and field aligned currents in the plasma sheet boundary layer

AU - Draper, N. C.

AU - Lester, M.

AU - Cowley, S. W. H.

AU - Wild, J. A.

AU - Milan, S. E.

AU - Provan, G.

AU - Grocott, A.

AU - Fazakerley, A. N.

AU - Lahiff, A.

AU - Davies, J. A.

AU - Bosqued, J. M.

AU - Dewhurst, J. P.

AU - Nakamura, R.

AU - Owen, C. J.

AU - Watermann, J. F.

AU - Henderson, M. G.

AU - Singer, H. J.

AU - Donovan, E.

PY - 2005/12

Y1 - 2005/12

N2 - We present data from both ground- and space- based instruments for a substorm event which occurred on 5 October 2002, with an expansion phase onset time of 02:50 UT determined from the ground magnetometer data. During this substorm, the Cluster spacecraft were located around 15 RE downtail, 8 RE from midnight in the pre- midnight sector and just 2 RE above the equatorial plane (in GSM coordinates). At expansion phase onset the Cluster spacecraft were located in the plasma sheet, tailward of a near-Earth neutral line and detected a significant time delay of 6 min between the tail field Bz component becoming negative and the subsequent detection of Earthward flows. This is explained by the formation of a tailward-directed travel- ling compression region initially Earthward of the spacecraft; 7 min later the Cluster spacecraft entered the plasma sheet boundary layer; they remained in and close to the plasma sheet boundary layer for around 15 min before exiting to the lobe. The spacecraft then re-entered the plasma sheet 30 min after onset. Earthward then tailward directed currents detected in the plasma sheet boundary layer after onset indicate that the Cluster spacecraft encountered the dawnward and duskward portions of the reconnection flow associated current system with Region 1 sense, respectively. The reconnection site and current system were initially skewed towards the pre-midnight sector, consistent with previous observations that found the majority of substorm onsets located in this sector. At later times the reconnection site and current system had moved towards dawn, to be located more centrally in the midnight sector.

AB - We present data from both ground- and space- based instruments for a substorm event which occurred on 5 October 2002, with an expansion phase onset time of 02:50 UT determined from the ground magnetometer data. During this substorm, the Cluster spacecraft were located around 15 RE downtail, 8 RE from midnight in the pre- midnight sector and just 2 RE above the equatorial plane (in GSM coordinates). At expansion phase onset the Cluster spacecraft were located in the plasma sheet, tailward of a near-Earth neutral line and detected a significant time delay of 6 min between the tail field Bz component becoming negative and the subsequent detection of Earthward flows. This is explained by the formation of a tailward-directed travel- ling compression region initially Earthward of the spacecraft; 7 min later the Cluster spacecraft entered the plasma sheet boundary layer; they remained in and close to the plasma sheet boundary layer for around 15 min before exiting to the lobe. The spacecraft then re-entered the plasma sheet 30 min after onset. Earthward then tailward directed currents detected in the plasma sheet boundary layer after onset indicate that the Cluster spacecraft encountered the dawnward and duskward portions of the reconnection flow associated current system with Region 1 sense, respectively. The reconnection site and current system were initially skewed towards the pre-midnight sector, consistent with previous observations that found the majority of substorm onsets located in this sector. At later times the reconnection site and current system had moved towards dawn, to be located more centrally in the midnight sector.

U2 - 10.5194/angeo-23-3667-2005

DO - 10.5194/angeo-23-3667-2005

M3 - Journal article

VL - 23

SP - 3667

EP - 3683

JO - Annales Geophysicae

JF - Annales Geophysicae

SN - 0992-7689

IS - 12

ER -

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