Coordinated Cluster and ground-based instrument observations of transient changes in the magnetopause boundary layer during an interval of predominantly northward IMF: relation to reconnection pulses and FTE signatures
We study a series of transient entries into the low-latitude boundary layer (LLBL) of all four Cluster spacecraft during an outbound pass through the mid-afternoon magnetopause ([X(GSM), Y(GSM), Z(GSM)] approximate to [2, 7, 9] R(E)). The events take place during an interval of northward IMF, as see...
Published in: | Annales Geophysicae |
---|---|
Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2001
|
Subjects: | |
Online Access: | https://centaur.reading.ac.uk/38716/ https://centaur.reading.ac.uk/38716/1/200_Lockwoodetal_Cl2_ag1613.pdf https://doi.org/10.5194/angeo-19-1613-2001 |
id |
ftunivreading:oai:centaur.reading.ac.uk:38716 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
CentAUR: Central Archive at the University of Reading |
op_collection_id |
ftunivreading |
language |
English |
description |
We study a series of transient entries into the low-latitude boundary layer (LLBL) of all four Cluster spacecraft during an outbound pass through the mid-afternoon magnetopause ([X(GSM), Y(GSM), Z(GSM)] approximate to [2, 7, 9] R(E)). The events take place during an interval of northward IMF, as seen in the data from the ACE satellite and lagged by a propagation delay of 75 min that is well-defined by two separate studies: (1) the magnetospheric variations prior to the northward turning (Lockwood et al., 2001, this issue) and (2) the field clock angle seen by Cluster after it had emerged into the magnetosheath (Opgenoorth et al., 2001, this issue). With an additional lag of 16.5 min, the transient LLBL events cor-relate well with swings of the IMF clock angle (in GSM) to near 90degrees. Most of this additional lag is explained by ground-based observations, which reveal signatures of transient reconnection in the pre-noon sector that then take 10-15 min to propagate eastward to 15 MLT, where they are observed by Cluster. The eastward phase speed of these signatures agrees very well with the motion deduced by the cross-correlation of the signatures seen on the four Cluster spacecraft. The evidence that these events are reconnection pulses includes: transient erosion of the noon 630 nm (cusp/cleft) aurora to lower latitudes; transient and travelling enhancements of the flow into the polar cap, imaged by the AMIE technique; and poleward-moving events moving into the polar cap, seen by the EISCAT Svalbard Radar (ESR). A pass of the DMSP-F15 satellite reveals that the open field lines near noon have been opened for some time: the more recently opened field lines were found closer to dusk where the flow transient and the poleward-moving event intersected the satellite pass. The events at Cluster have ion and electron characteristics predicted and observed by Lockwood and Hapgood (1998) for a Flux Transfer Event (FTE), with allowance for magnetospheric ion reflection at Alfvenic disturbances in the magnetopause ... |
format |
Article in Journal/Newspaper |
author |
Lockwood, Mike Fazakerley, A. Opgenoorth, H. Moen, J. van Eyken, A. P. Dunlop, M. Bosqued, J.-M. Lu, G. Cully, C. Eglitis, P. McCrea, I. W. Hapgood, M. A. Wild, M. N. Stamper, R. Denig, W. Taylor, M. Wild, J. A. Provan, G. Amm, O. Kauristie, K. Pulkkinen, T. Strømme, A. Prikryl, P. Pitout, F. Balogh, A. Rème, H. Behlke, R. Hansen, T. Greenwald, R. Frey, H. Morley, S. K. Alcaydé, D. Blelly, P.-L. Donovan, E. Engebretson, M. Lester, M. Watermann, J. Marcucci, M. F. |
spellingShingle |
Lockwood, Mike Fazakerley, A. Opgenoorth, H. Moen, J. van Eyken, A. P. Dunlop, M. Bosqued, J.-M. Lu, G. Cully, C. Eglitis, P. McCrea, I. W. Hapgood, M. A. Wild, M. N. Stamper, R. Denig, W. Taylor, M. Wild, J. A. Provan, G. Amm, O. Kauristie, K. Pulkkinen, T. Strømme, A. Prikryl, P. Pitout, F. Balogh, A. Rème, H. Behlke, R. Hansen, T. Greenwald, R. Frey, H. Morley, S. K. Alcaydé, D. Blelly, P.-L. Donovan, E. Engebretson, M. Lester, M. Watermann, J. Marcucci, M. F. Coordinated Cluster and ground-based instrument observations of transient changes in the magnetopause boundary layer during an interval of predominantly northward IMF: relation to reconnection pulses and FTE signatures |
author_facet |
Lockwood, Mike Fazakerley, A. Opgenoorth, H. Moen, J. van Eyken, A. P. Dunlop, M. Bosqued, J.-M. Lu, G. Cully, C. Eglitis, P. McCrea, I. W. Hapgood, M. A. Wild, M. N. Stamper, R. Denig, W. Taylor, M. Wild, J. A. Provan, G. Amm, O. Kauristie, K. Pulkkinen, T. Strømme, A. Prikryl, P. Pitout, F. Balogh, A. Rème, H. Behlke, R. Hansen, T. Greenwald, R. Frey, H. Morley, S. K. Alcaydé, D. Blelly, P.-L. Donovan, E. Engebretson, M. Lester, M. Watermann, J. Marcucci, M. F. |
author_sort |
Lockwood, Mike |
title |
Coordinated Cluster and ground-based instrument observations of transient changes in the magnetopause boundary layer during an interval of predominantly northward IMF: relation to reconnection pulses and FTE signatures |
title_short |
Coordinated Cluster and ground-based instrument observations of transient changes in the magnetopause boundary layer during an interval of predominantly northward IMF: relation to reconnection pulses and FTE signatures |
title_full |
Coordinated Cluster and ground-based instrument observations of transient changes in the magnetopause boundary layer during an interval of predominantly northward IMF: relation to reconnection pulses and FTE signatures |
title_fullStr |
Coordinated Cluster and ground-based instrument observations of transient changes in the magnetopause boundary layer during an interval of predominantly northward IMF: relation to reconnection pulses and FTE signatures |
title_full_unstemmed |
Coordinated Cluster and ground-based instrument observations of transient changes in the magnetopause boundary layer during an interval of predominantly northward IMF: relation to reconnection pulses and FTE signatures |
title_sort |
coordinated cluster and ground-based instrument observations of transient changes in the magnetopause boundary layer during an interval of predominantly northward imf: relation to reconnection pulses and fte signatures |
publisher |
Copernicus Publications |
publishDate |
2001 |
url |
https://centaur.reading.ac.uk/38716/ https://centaur.reading.ac.uk/38716/1/200_Lockwoodetal_Cl2_ag1613.pdf https://doi.org/10.5194/angeo-19-1613-2001 |
long_lat |
ENVELOPE(167.400,167.400,-84.150,-84.150) |
geographic |
Lockwood Svalbard |
geographic_facet |
Lockwood Svalbard |
genre |
EISCAT Svalbard |
genre_facet |
EISCAT Svalbard |
op_relation |
https://centaur.reading.ac.uk/38716/1/200_Lockwoodetal_Cl2_ag1613.pdf Lockwood, M. <https://centaur.reading.ac.uk/view/creators/90001127.html> orcid:0000-0002-7397-2172 , Fazakerley, A., Opgenoorth, H., Moen, J., van Eyken, A. P., Dunlop, M., Bosqued, J.-M., Lu, G., Cully, C., Eglitis, P., McCrea, I. W., Hapgood, M. A., Wild, M. N., Stamper, R., Denig, W., Taylor, M., Wild, J. A., Provan, G., Amm, O., Kauristie, K., Pulkkinen, T., Strømme, A., Prikryl, P., Pitout, F., Balogh, A., Rème, H., Behlke, R., Hansen, T., Greenwald, R., Frey, H., Morley, S. K., Alcaydé, D., Blelly, P.-L., Donovan, E., Engebretson, M., Lester, M., Watermann, J. and Marcucci, M. F. (2001) Coordinated Cluster and ground-based instrument observations of transient changes in the magnetopause boundary layer during an interval of predominantly northward IMF: relation to reconnection pulses and FTE signatures. Annales Geophysicae, 19 (10/12). pp. 1613-1640. ISSN 0992-7689 doi: https://doi.org/10.5194/angeo-19-1613-2001 <https://doi.org/10.5194/angeo-19-1613-2001> |
op_doi |
https://doi.org/10.5194/angeo-19-1613-2001 |
container_title |
Annales Geophysicae |
container_volume |
19 |
container_issue |
10/12 |
container_start_page |
1613 |
op_container_end_page |
1640 |
_version_ |
1802643766767517696 |
spelling |
ftunivreading:oai:centaur.reading.ac.uk:38716 2024-06-23T07:52:28+00:00 Coordinated Cluster and ground-based instrument observations of transient changes in the magnetopause boundary layer during an interval of predominantly northward IMF: relation to reconnection pulses and FTE signatures Lockwood, Mike Fazakerley, A. Opgenoorth, H. Moen, J. van Eyken, A. P. Dunlop, M. Bosqued, J.-M. Lu, G. Cully, C. Eglitis, P. McCrea, I. W. Hapgood, M. A. Wild, M. N. Stamper, R. Denig, W. Taylor, M. Wild, J. A. Provan, G. Amm, O. Kauristie, K. Pulkkinen, T. Strømme, A. Prikryl, P. Pitout, F. Balogh, A. Rème, H. Behlke, R. Hansen, T. Greenwald, R. Frey, H. Morley, S. K. Alcaydé, D. Blelly, P.-L. Donovan, E. Engebretson, M. Lester, M. Watermann, J. Marcucci, M. F. 2001 text https://centaur.reading.ac.uk/38716/ https://centaur.reading.ac.uk/38716/1/200_Lockwoodetal_Cl2_ag1613.pdf https://doi.org/10.5194/angeo-19-1613-2001 en eng Copernicus Publications https://centaur.reading.ac.uk/38716/1/200_Lockwoodetal_Cl2_ag1613.pdf Lockwood, M. <https://centaur.reading.ac.uk/view/creators/90001127.html> orcid:0000-0002-7397-2172 , Fazakerley, A., Opgenoorth, H., Moen, J., van Eyken, A. P., Dunlop, M., Bosqued, J.-M., Lu, G., Cully, C., Eglitis, P., McCrea, I. W., Hapgood, M. A., Wild, M. N., Stamper, R., Denig, W., Taylor, M., Wild, J. A., Provan, G., Amm, O., Kauristie, K., Pulkkinen, T., Strømme, A., Prikryl, P., Pitout, F., Balogh, A., Rème, H., Behlke, R., Hansen, T., Greenwald, R., Frey, H., Morley, S. K., Alcaydé, D., Blelly, P.-L., Donovan, E., Engebretson, M., Lester, M., Watermann, J. and Marcucci, M. F. (2001) Coordinated Cluster and ground-based instrument observations of transient changes in the magnetopause boundary layer during an interval of predominantly northward IMF: relation to reconnection pulses and FTE signatures. Annales Geophysicae, 19 (10/12). pp. 1613-1640. ISSN 0992-7689 doi: https://doi.org/10.5194/angeo-19-1613-2001 <https://doi.org/10.5194/angeo-19-1613-2001> Article PeerReviewed 2001 ftunivreading https://doi.org/10.5194/angeo-19-1613-2001 2024-06-11T15:02:59Z We study a series of transient entries into the low-latitude boundary layer (LLBL) of all four Cluster spacecraft during an outbound pass through the mid-afternoon magnetopause ([X(GSM), Y(GSM), Z(GSM)] approximate to [2, 7, 9] R(E)). The events take place during an interval of northward IMF, as seen in the data from the ACE satellite and lagged by a propagation delay of 75 min that is well-defined by two separate studies: (1) the magnetospheric variations prior to the northward turning (Lockwood et al., 2001, this issue) and (2) the field clock angle seen by Cluster after it had emerged into the magnetosheath (Opgenoorth et al., 2001, this issue). With an additional lag of 16.5 min, the transient LLBL events cor-relate well with swings of the IMF clock angle (in GSM) to near 90degrees. Most of this additional lag is explained by ground-based observations, which reveal signatures of transient reconnection in the pre-noon sector that then take 10-15 min to propagate eastward to 15 MLT, where they are observed by Cluster. The eastward phase speed of these signatures agrees very well with the motion deduced by the cross-correlation of the signatures seen on the four Cluster spacecraft. The evidence that these events are reconnection pulses includes: transient erosion of the noon 630 nm (cusp/cleft) aurora to lower latitudes; transient and travelling enhancements of the flow into the polar cap, imaged by the AMIE technique; and poleward-moving events moving into the polar cap, seen by the EISCAT Svalbard Radar (ESR). A pass of the DMSP-F15 satellite reveals that the open field lines near noon have been opened for some time: the more recently opened field lines were found closer to dusk where the flow transient and the poleward-moving event intersected the satellite pass. The events at Cluster have ion and electron characteristics predicted and observed by Lockwood and Hapgood (1998) for a Flux Transfer Event (FTE), with allowance for magnetospheric ion reflection at Alfvenic disturbances in the magnetopause ... Article in Journal/Newspaper EISCAT Svalbard CentAUR: Central Archive at the University of Reading Lockwood ENVELOPE(167.400,167.400,-84.150,-84.150) Svalbard Annales Geophysicae 19 10/12 1613 1640 |