Magnetopause and Boundary Layer

Keyser, Johan De; Dunlop, M. W.; Owen, C. J.; Sonnerup, B. U. Ö.; Haaland, Stein; Vaivads, A.; Paschmann, G.; Lundin, R.; Rezeau, Laurence

doi:10.1007/s11214-005-3834-1

Cited by 58 publications

(43 citation statements)

References 143 publications

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“…One branch lies in cylindrically symmetric plasma systems which are ubiquitously observed in geo-space by a multitude of measurements from, e.g., ground-based imagers ( Pimenta et al 2001), rockets (Earle et al 1989;Moore et al 1996), and satellites (Pickett et al 2004;Vaivads et al 2004;De Keyser et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Nonlinear ion-acoustic (IA) waves driven in a cylindrically symmetric flow

John

2010

Astrophys Space Sci

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By employing a self-similar, two-fluid MHD model in a cylindrical geometry, we study the features of nonlinear ion-acoustic (IA) waves which propagate in the direction of external magnetic field lines in space plasmas. Numerical calculations not only expose the well-known three shapes of nonlinear structures (sinusoidal, sawtooth, and spiky or bipolar) which are observed by numerous satellites and simulated by models in a Cartesian geometry, but also illustrate new results, such as, two reversely propagating nonlinear waves, density dips and humps, diverging and converging electric shocks, etc. A case study on Cluster satellite data is also introduced.

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Section: Introductionmentioning

confidence: 99%

Nonlinear ion-acoustic (IA) waves driven in a cylindrically symmetric flow

John

2010

Astrophys Space Sci

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“…Here we briefly outline some of the essential results and features of magnetopause structure and dynamics. The magnetopause itself has been the subject of numerous more-detailed reviews and monographs (e.g., Lundin 1988;Song et al 1995;Paschmann 1997;Sibeck et al 1999b;Farrugia et al 2001;De Keyser et al 2005;Phan et al 2005a;Lavraud et al 2011;Hasegawa 2012), and the interested reader is invited to consult these articles and reviews for more information.…”

Section: Basic Structure Of the Magnetopausementioning

confidence: 99%

What Controls the Structure and Dynamics of Earth’s Magnetosphere?

et al. 2014

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Unlike most cosmic plasma structures, planetary magnetospheres can be extensively studied in situ. In particular, studies of the Earth's magnetosphere over the past few decades have resulted in a relatively good experimental understanding of both its basic structural properties and its response to changes in the impinging solar wind. In this article we provide a broad overview, designed for researchers unfamiliar with magnetospheric physics, of the main processes and parameters that control the structure and dynamics of planetary magnetospheres, especially the Earth's. In particular, we concentrate on the structure and dynamics of three important regions: the bow shock, the magnetopause and the magnetotail. In the final part of this review we describe the current status of global magnetospheric modelling, which is crucial to placing in situ observations in the proper context and providing a better understanding of magnetospheric structure and dynamics under all possible input conditions. Although the parameter regime experienced in the solar system is limited, the plasma physics that is learned by studying planetary magnetospheres can, in principle, be translated to more general studies of cosmic plasma structures. Conversely, studies of cosmic plasma under a wide range of conditions should be used to understand Earth's

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“…The transport of plasma across a magnetopause produces mixed plasma regimes adjacent to the interface that are known as boundary layers. Spacecraft observations have revealed that the low-latitude boundary layer (LLBL) earthward of the magnetopause contains a mixture of magnetospheric and magnetosheath plasma with a generally tailward bulk flow (see, e.g., the review by De Keyser et al 2005). Observations have also revealed that although the layer is a quasi-permanent feature of the terrestrial magnetosphere, its properties are also highly variable (Masters et al 2011 and references therein).…”

Section: High-latitude Solar Wind-magnetosphere-ionosphere Couplingmentioning

confidence: 99%

Geomagnetic response to solar and interplanetary disturbances

Sáiz

Cerrato

Cid

et al. 2013

J. Space Weather Space Clim.

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The space weather discipline involves different physical scenarios, which are characterised by very different physical conditions, ranging from the Sun to the terrestrial magnetosphere and ionosphere. Thanks to the great modelling effort made during the last years, a few Sun-to-ionosphere/thermosphere physics-based numerical codes have been developed. However, the success of the prediction is still far from achieving the desirable results and much more progress is needed. Some aspects involved in this progress concern both the technical progress (developing and validating tools to forecast, selecting the optimal parameters as inputs for the tools, improving accuracy in prediction with short lead time, etc.) and the scientific development, i.e., deeper understanding of the energy transfer process from the solar wind to the coupled magnetosphere-ionosphere-thermosphere system. The purpose of this paper is to collect the most relevant results related to these topics obtained during the COST Action ES0803. In an end-to-end forecasting scheme that uses an artificial neural network, we show that the forecasting results improve when gathering certain parameters, such as X-ray solar flares, Type II and/or Type IV radio emission and solar energetic particles enhancements as inputs for the algorithm. Regarding the solar wind-magnetosphere-ionosphere interaction topic, the geomagnetic responses at high and low latitudes are considered separately. At low latitudes, we present new insights into temporal evolution of the ring current, as seen by Burton's equation, in both main and recovery phases of the storm. At high latitudes, the PCC index appears as an achievement in modelling the coupling between the upper atmosphere and the solar wind, with a great potential for forecasting purposes. We also address the important role of small-scale field-aligned currents in Joule heating of the ionosphere even under non-disturbed conditions. Our scientific results in the framework of the COST Action ES0803 cover the topics from the short-term solar-activity evolution, i.e., space weather, to the long-term evolution of relevant solar/heliospheric/magnetospheric parameters, i.e., space climate. On the timescales of the Hale and Gleissberg cycles (22-and 88-year cycle respectively) we can highlight that the trend of solar, heliospheric and geomagnetic parameters shows the solar origin of the widely discussed increase in geomagnetic activity in the last century.

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Magnetopause and Boundary Layer

Abstract: International audienceNot Availabl

Cited by 58 publications

References 143 publications

Nonlinear ion-acoustic (IA) waves driven in a cylindrically symmetric flow

Nonlinear ion-acoustic (IA) waves driven in a cylindrically symmetric flow

What Controls the Structure and Dynamics of Earth’s Magnetosphere?

Geomagnetic response to solar and interplanetary disturbances

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