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Your search keyword '"Escoubet, C. P."' showing total 13 results
Start Over Author "Escoubet, C. P." Journal geophysical research letters
13 results on '"Escoubet, C. P."'

2. Staircase ion signature in the polar cusp - A case study

Author

Escoubet, C. P, Smith, M. F, Fung, S. F, Anderson, P. C, Hoffman, R. A, Basinska, E. M, and Bosqued, J. M

Subjects
Geophysics
Abstract

On 15 October, 1981 Dynamics Explorer 2 crossed the polar cusp at 1015 MLT and observed three distinct ion populations as it was moving poleward. These three populations had peak-flux energy around 2.7 keV, 850 eV, and 360 eV. At the time of observation, the IMF was southward. The first step coincided with a rotation of the flow from westward to poleward and then eastward. The second and third steps showed a flow directed principally poleward. Furthermore, the magnetic and electric perturbations in the first step are well fitted by an elongated flux tube footprint model. These results suggest that three consecutive Flux Transfer Events (FTEs) have injected solar wind plasma into the ionosphere forming the polar cusp. The individual FTE signatures can only be identified by the jumps in the precipitation pattern. The newest reconnected FTE footprint was crossed near the edge of the event while the two oldest ones were crossed around the event center. The small latitudinal size of these FTE footprints (40 km) and their short recurrence rate (3, 6 min) is consistent with an intermittent reconnection taking place at the subsolar point on a short time scale.

Published
1992

5. Multispacecraft Observations of the Simultaneous Occurrence of Magnetic Reconnection at High and Low Latitudes During the Passage of a Solar Wind Rotational Discontinuity Embedded in the April 9‐11, 2015 ICME

Author

Wing, Simon, Berchem, Jean, Escoubet, C. Philippe, Farrugia, Charles, and Lugaz, Noé

Abstract

Numerous questions remain about how solar wind directional discontinuities, for example, rotational discontinuities (RDs), affect energy and transport processes at the magnetopause. The impact on the dayside magnetosphere of a solar wind RD is studied. The study shows that the RD leads to complex structures at the magnetopause, boundary layer, mantle, and cusp even though the geomagnetic activity level remains low. At low altitudes, the Defense Meteorological Satellite Program spacecraft observe a double cusp that is a signature of magnetic reconnection occurring at both high and low latitudes due to the dominant IMF By, while Cluster C2, located at high‐latitude and high‐altitude in the southern hemisphere, observes velocity fluctuations and reversals with peak‐to‐peak amplitudes >800 km s−1as it crosses the magnetopause. A global MHD simulation of the event shows that the C2 observations are consistent with the spacecraft crossing reconnection outflows while moving from one side of the X‐line to the other. Many studies of the geoffectiveness of the solar wind structures tend to focus on large structures such as coronal mass ejections or corotating high‐speed streams, which can drive large geomagnetic activities such as storms or substorms. Fewer studies focus on the smaller scale structures such as solar wind directional discontinuity (DD). Numerous questions remain about how DDs affect energy conversion and transport processes at the magnetopause. We present an example that shows that a solar wind rotational discontinuity (RD), which is a class of DD, and its accompanying flow rotation can lead to complex structures at the magnetopause, boundary layer, mantle, and cusp even though the geomagnetic activity level remains low. At low altitudes, the Defense Meteorological Satellite Program spacecraft observe a double cusp that is a signature of magnetic reconnection occurring at both high and low latitudes due to the dominant IMF By, which is corroborated in a global MHD simulation. Cluster C2, located at high‐latitude and high‐altitude, observes velocity fluctuations and reversals with peak‐to‐peak amplitudes >800 km s−1as it crosses the magnetopause. The MHD simulation of the event shows that the C2 observations are consistent with the spacecraft crossing reconnection outflows while moving from one side of the X‐line to the other. A solar wind rotational discontinuity can lead to complex structures at the magnetopause, boundary layer, and cusp even during quiet timesDefense Meteorological Satellite Program observes double cusp signatures indicating that reconnection is occurring at both high and low latitudes due to dominant IMF ByThe observed large velocity reversals at the magnetopause are consistent with Cluster moving from one side of the X‐line to the other A solar wind rotational discontinuity can lead to complex structures at the magnetopause, boundary layer, and cusp even during quiet times Defense Meteorological Satellite Program observes double cusp signatures indicating that reconnection is occurring at both high and low latitudes due to dominant IMF By The observed large velocity reversals at the magnetopause are consistent with Cluster moving from one side of the X‐line to the other

Published
2023
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6. Tracing solar wind plasma entry into the magnetosphere using ion-to-electron temperature ratio

Author

Lavraud, B., primary, Borovsky, J. E., additional, Génot, V., additional, Schwartz, S. J., additional, Birn, J., additional, Fazakerley, A. N., additional, Dunlop, M. W., additional, Taylor, M. G. G. T., additional, Hasegawa, H., additional, Rouillard, A. P., additional, Berchem, J., additional, Bogdanova, Y., additional, Constantinescu, D., additional, Dandouras, I., additional, Eastwood, J. P., additional, Escoubet, C. P., additional, Frey, H., additional, Jacquey, C., additional, Panov, E., additional, Pu, Z. Y., additional, Shen, C., additional, Shi, J., additional, Sibeck, D. G., additional, Volwerk, M., additional, and Wild, J. A., additional

Published
2009
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7. Electron trapping around a magnetic null

Author

He, J.-S., primary, Zong, Q.-G., additional, Deng, X.-H., additional, Tu, C.-Y., additional, Xiao, C.-J., additional, Wang, X.-G., additional, Ma, Z.-W., additional, Pu, Z.-Y., additional, Lucek, E., additional, Pedersen, A., additional, Fazakerley, A., additional, Cornilleau-Wehrlin, N., additional, Dunlop, M. W., additional, Tian, H., additional, Yao, S., additional, Tan, B., additional, Fu, S.-Y., additional, Glassmeier, K.-H., additional, Reme, H., additional, Dandouras, I., additional, and Escoubet, C. P., additional

Published
2008
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8. TC‐1 observations of flux pileup and dipolarization‐associated expansion in the near‐Earth magnetotail during substorms

Author

Zhang, H., primary, Pu, Z. Y., additional, Cao, X., additional, Fu, S. Y., additional, Liu, Z. X., additional, Ma, Z. W., additional, Dunlop, M. W., additional, Baumjohann, W., additional, Xiao, C. J., additional, Hong, M. H., additional, Cao, J. B., additional, Zong, Q. G., additional, Wang, X. G., additional, Carr, C., additional, Rème, H. A., additional, Dandouras, I., additional, Fazakerley, A., additional, Frey, H. U., additional, and Escoubet, C. P., additional

Published
2007
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9. A Cluster measurement of fast magnetic reconnection in the magnetotail

Author

Xiao, C. J., primary, Pu, Z. Y., additional, Wang, X. G., additional, Ma, Z. W., additional, Fu, S. Y., additional, Phan, T. D., additional, Zong, Q. G., additional, Liu, Z. X., additional, Dunlop, M. W., additional, Glassmeier, K.‐H., additional, Balogh, A., additional, Reme, H., additional, Dandouras, I., additional, and Escoubet, C. P., additional

Published
2007
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12. Cluster observations of the exterior cusp and its surrounding boundaries under northward IMF

Author

Lavraud, B., primary, Dunlop, M. W., additional, Phan, T. D., additional, Rème, H., additional, Bosqued, J.-M., additional, Dandouras, I., additional, Sauvaud, J.-A., additional, Lundin, R., additional, Taylor, M. G. G. T., additional, Cargill, P. J., additional, Mazelle, C., additional, Escoubet, C. P., additional, Carlson, C. W., additional, McFadden, J. P., additional, Parks, G. K., additional, Moebius, E., additional, Kistler, L. M., additional, Bavassano-Cattaneo, M.-B., additional, Korth, A., additional, Klecker, B., additional, and Balogh, A., additional

Published
2002
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