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Spatial and Temporal Cusp Structures Observed by Multiple Spacecraft and Ground Based Observations

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Abstract

Downward precipitating ions in the cusp regularly exhibit sudden changes in ion energy distributions, forming distinctive structures that can be used to study the temporal/spatial nature of reconnection at the magnetopause. When observed simultaneously with the Polar, FAST, and Interball satellites, such cusp structures revealed remarkably similar features. These similar features could be observed for up to several hours during stable solar wind conditions. Their similarities led to the conclusion that large-scale cusp structures are spatial structures related to global ionospheric convection patterns created by magnetic merging and not the result of temporal variations in reconnection parameters. The launch of the Cluster fleet allows cusp structures to be studied in great detail and during changing solar wind conditions using three spacecraft with identical plasma and field instrumentation. In addition, Cluster cusp measurements are linked with ionospheric convection cells by combining the satellite observations with SuperDARN radar observations that are used to derive the convection patterns in the ionosphere. The combination of satellite observations with ground-based observations during variable solar wind conditions shows that large-scale cusp structures can be either spatial or temporal. Cusp structures can be described as spatial features observed by satellites crossing into spatially separated flux tubes. Cusp structures can also be observed as poleward-traveling (temporal) features within the same convection cell, most probably caused by variations in the reconnection rate at the magnetopause.

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Abbreviations

APL:

Applied Physics Laboratory, Johns Hopkins University

DMSP:

Defense Meterological Satellite Program

ML:

magnetic local time

FAST:

Fast Auroral SnapshoT satellite

SC:

spacecraft

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Authors and Affiliations

  1. Lockheed-Martin Advanced Technology Center, 94304, Palo Alto, CA, USA

    K. J. Trattner & S. A. Fuselier

  2. Department of Physics and Astronomy, University of Leicester, LE1 7RH, Leicester, England

    T. K. Yeoman

  3. University of California, 94724, Berkeley, CA, USA

    C. Carlson

  4. Laboratory for Atmospheric and Space Physics, University of Colorado, 80309, Boulder, CO, USA

    W. K. Peterson

  5. Max-Planck-Institut für Aeronomie, Katlenburg-Lindau, Germany

    A. Korth

  6. CESR, Toulouse, France

    H. Reme & J. A. Sauvaud

  7. LPCE/CNES, Orleans, France

    N. Dubouloz

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  1. K. J. Trattner
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  2. S. A. Fuselier
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  4. C. Carlson
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  8. J. A. Sauvaud
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  9. N. Dubouloz
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Correspondence to K. J. Trattner.

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Trattner, K.J., Fuselier, S.A., Yeoman, T.K. et al. Spatial and Temporal Cusp Structures Observed by Multiple Spacecraft and Ground Based Observations. Surv Geophys 26, 281–305 (2005). https://doi.org/10.1007/s10712-005-1883-3

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  • DOI: https://doi.org/10.1007/s10712-005-1883-3

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