Enhanced magnetospheric/boundary layer plasma flows observed during transient magnetopause crossings

K. H. Kim; N. Lin; C. A. Cattell; D. H. Lee; S. Kokubun; T. Mukai; K. Tsuruda

doi:10.1029/133GM08

Enhanced magnetospheric/boundary layer plasma flows observed during transient magnetopause crossings

K. H. Kim, N. Lin, C. A. Cattell, D. H. Lee, S. Kokubun, T. Mukai, K. Tsuruda

Physics and Astronomy (Twin Cities)

Research output: Chapter in Book/Report/Conference proceeding › Chapter

Abstract

We observed enhanced plasma flows inside the magnetopause while the Geotail satellite briefly crossed the magnetopause. The enhanced flows were mainly in the MN plane of the LMN coordinates. Some of them showed a bipolar signature, i.e., inward flow before the outbound (from the magnetosphere to the magnetosheath) crossing and then outward flow after the inbound (from the magnetosheath to the magnetosphere) crossing, in the component normal to the nominal magnetopause. We found two different types of the bipolar flow: one is roughly symmetric with respect to the center of the event, that is, the peak amplitudes of the inward and outward flows are comparable, and the other is strongly asymmetric, that is, the outward flow speed is much larger than the inward flow speed. Using a simple qualitative model, we show that the symmetric bipolar flow is consistent with a vortical plasma motion from the E × B drift. The source of the electric field E may be attributed to briefly compressed magnetopause moving tailward, which is induced by a transient external (solar wind/foreshock) pressure pulse. In the asymmetric case, the strong outward flows were accompanied by a depressed magnetic field strength. This suggests that the strong outward plasma motion is associated with transient magnetospheric expansion driven by external pressure pulse variations.

Original language	English (US)
Title of host publication	Earth?s Low-Latitude Boundary Layer, 2003
Editors	Patrick T. Newell, Terry Onsager
Publisher	Blackwell Publishing Ltd
Pages	83-91
Number of pages	9
ISBN (Electronic)	9781118668566
ISBN (Print)	9780875909929
DOIs	https://doi.org/10.1029/133GM08
State	Published - 2002

Publication series

Name	Geophysical Monograph Series
Volume	133
ISSN (Print)	0065-8448
ISSN (Electronic)	2328-8779

Bibliographical note

Funding Information:
The Geotail magnetic field and plasma data were provided through DARTS at the Institute of Space and Astronautical Science (ISAS) in Japan. This work was supported by the National Aeronautics and Space Administration under grant NAG5-7462.

Funding Information:
Acknowledgments. The Geotail magnetic field and plasma data were provided through DARTS at the Institute of Space and Astronautical Science (ISAS) in Japan. This work was supported by the National Aeronautics and Space Administration under grant NAG5-7462.

Publisher Copyright:
© 2003 by the American Geophysical Union.

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10.1029/133GM08

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Kim, K. H., Lin, N., Cattell, C. A., Lee, D. H., Kokubun, S., Mukai, T., & Tsuruda, K. (2002). Enhanced magnetospheric/boundary layer plasma flows observed during transient magnetopause crossings. In P. T. Newell, & T. Onsager (Eds.), Earth?s Low-Latitude Boundary Layer, 2003 (pp. 83-91). (Geophysical Monograph Series; Vol. 133). Blackwell Publishing Ltd. https://doi.org/10.1029/133GM08

Enhanced magnetospheric/boundary layer plasma flows observed during transient magnetopause crossings. / Kim, K. H.; Lin, N.; Cattell, C. A. et al.
Earth?s Low-Latitude Boundary Layer, 2003. ed. / Patrick T. Newell; Terry Onsager. Blackwell Publishing Ltd, 2002. p. 83-91 (Geophysical Monograph Series; Vol. 133).

Research output: Chapter in Book/Report/Conference proceeding › Chapter

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abstract = "We observed enhanced plasma flows inside the magnetopause while the Geotail satellite briefly crossed the magnetopause. The enhanced flows were mainly in the MN plane of the LMN coordinates. Some of them showed a bipolar signature, i.e., inward flow before the outbound (from the magnetosphere to the magnetosheath) crossing and then outward flow after the inbound (from the magnetosheath to the magnetosphere) crossing, in the component normal to the nominal magnetopause. We found two different types of the bipolar flow: one is roughly symmetric with respect to the center of the event, that is, the peak amplitudes of the inward and outward flows are comparable, and the other is strongly asymmetric, that is, the outward flow speed is much larger than the inward flow speed. Using a simple qualitative model, we show that the symmetric bipolar flow is consistent with a vortical plasma motion from the E × B drift. The source of the electric field E may be attributed to briefly compressed magnetopause moving tailward, which is induced by a transient external (solar wind/foreshock) pressure pulse. In the asymmetric case, the strong outward flows were accompanied by a depressed magnetic field strength. This suggests that the strong outward plasma motion is associated with transient magnetospheric expansion driven by external pressure pulse variations.",

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note = "Funding Information: The Geotail magnetic field and plasma data were provided through DARTS at the Institute of Space and Astronautical Science (ISAS) in Japan. This work was supported by the National Aeronautics and Space Administration under grant NAG5-7462. Funding Information: Acknowledgments. The Geotail magnetic field and plasma data were provided through DARTS at the Institute of Space and Astronautical Science (ISAS) in Japan. This work was supported by the National Aeronautics and Space Administration under grant NAG5-7462. Publisher Copyright: {\textcopyright} 2003 by the American Geophysical Union.",

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AU - Kim, K. H.

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AU - Kokubun, S.

AU - Mukai, T.

AU - Tsuruda, K.

N1 - Funding Information: The Geotail magnetic field and plasma data were provided through DARTS at the Institute of Space and Astronautical Science (ISAS) in Japan. This work was supported by the National Aeronautics and Space Administration under grant NAG5-7462. Funding Information: Acknowledgments. The Geotail magnetic field and plasma data were provided through DARTS at the Institute of Space and Astronautical Science (ISAS) in Japan. This work was supported by the National Aeronautics and Space Administration under grant NAG5-7462. Publisher Copyright: © 2003 by the American Geophysical Union.

PY - 2002

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N2 - We observed enhanced plasma flows inside the magnetopause while the Geotail satellite briefly crossed the magnetopause. The enhanced flows were mainly in the MN plane of the LMN coordinates. Some of them showed a bipolar signature, i.e., inward flow before the outbound (from the magnetosphere to the magnetosheath) crossing and then outward flow after the inbound (from the magnetosheath to the magnetosphere) crossing, in the component normal to the nominal magnetopause. We found two different types of the bipolar flow: one is roughly symmetric with respect to the center of the event, that is, the peak amplitudes of the inward and outward flows are comparable, and the other is strongly asymmetric, that is, the outward flow speed is much larger than the inward flow speed. Using a simple qualitative model, we show that the symmetric bipolar flow is consistent with a vortical plasma motion from the E × B drift. The source of the electric field E may be attributed to briefly compressed magnetopause moving tailward, which is induced by a transient external (solar wind/foreshock) pressure pulse. In the asymmetric case, the strong outward flows were accompanied by a depressed magnetic field strength. This suggests that the strong outward plasma motion is associated with transient magnetospheric expansion driven by external pressure pulse variations.

AB - We observed enhanced plasma flows inside the magnetopause while the Geotail satellite briefly crossed the magnetopause. The enhanced flows were mainly in the MN plane of the LMN coordinates. Some of them showed a bipolar signature, i.e., inward flow before the outbound (from the magnetosphere to the magnetosheath) crossing and then outward flow after the inbound (from the magnetosheath to the magnetosphere) crossing, in the component normal to the nominal magnetopause. We found two different types of the bipolar flow: one is roughly symmetric with respect to the center of the event, that is, the peak amplitudes of the inward and outward flows are comparable, and the other is strongly asymmetric, that is, the outward flow speed is much larger than the inward flow speed. Using a simple qualitative model, we show that the symmetric bipolar flow is consistent with a vortical plasma motion from the E × B drift. The source of the electric field E may be attributed to briefly compressed magnetopause moving tailward, which is induced by a transient external (solar wind/foreshock) pressure pulse. In the asymmetric case, the strong outward flows were accompanied by a depressed magnetic field strength. This suggests that the strong outward plasma motion is associated with transient magnetospheric expansion driven by external pressure pulse variations.

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Enhanced magnetospheric/boundary layer plasma flows observed during transient magnetopause crossings

Abstract

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