Bibliografías temáticas / Auroral plasma

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Literatura académica sobre el tema "Auroral plasma"

Autor: Grafiati
Publicado: 6 de septiembre de 2023

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Artículos de revistas sobre el tema "Auroral plasma"

1

Titova, E. E., A. G. Yahnin, O. Santolík, et al. "The relationship between auroral hiss at high altitudes over the polar caps and the substorm dynamics of aurora." Annales Geophysicae 23, no. 6 (2005): 2117–28. http://dx.doi.org/10.5194/angeo-23-2117-2005.

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Abstract. Strong variations of intensity and cutoff frequency of the auroral hiss were observed by INTERBALL-2 and POLAR satellites at high altitudes, poleward from the auroral oval. The hiss intensifications are correlated with the auroral activations during substorms and/or pseudo-breakups. The low cutoff frequency of auroral hiss increases with the distance between the aurora and the satellite footprint. Multicomponent wave measurements of the hiss emissions on board the POLAR spacecraft show that the horizontal component of the Poynting flux of auroral hiss changes its direction in good ac
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2

Blomberg, L. G., J. A. Cumnock, I. I. Alexeev, E. S. Belenkaya, S. Yu Bobrovnikov, and V. V. Kalegaev. "Transpolar aurora: time evolution, associated convection patterns, and a possible cause." Annales Geophysicae 23, no. 5 (2005): 1917–30. http://dx.doi.org/10.5194/angeo-23-1917-2005.

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Abstract. We present two event studies illustrating the detailed relationships between plasma convection, field-aligned currents, and polar auroral emissions, as well as illustrating the influence of the Interplanetary Magnetic Field's y-component on theta aurora development. The transpolar arc of the theta aurorae moves across the entire polar region and becomes part of the opposite side of the auroral oval. Electric and magnetic field and precipitating particle data are provided by DMSP, while the POLAR UVI instrument provides measurements of auroral emissions. Ionospheric electrostatic pote
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3

Miyashita, Yukinaga, and Akimasa Ieda. "Revisiting substorm events with preonset aurora." Annales Geophysicae 36, no. 5 (2018): 1419–38. http://dx.doi.org/10.5194/angeo-36-1419-2018.

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Abstract. Nishimura et al. (2010) proposed a new plasma intrusion or preonset aurora scenario of substorm triggering. In this scenario, a substorm is triggered by a fast earthward flow generated at the distant neutral line which corresponds to a preonset auroral streamer or arc in the ionosphere propagating from the auroral poleward boundary to the initial auroral brightening site, i.e., “preonset aurora”. In the present paper, we revisited three substorm events reported as being triggered by such a mechanism related to preonset auroras, based on THEMIS ground-based all-sky imager data. Unlike
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4

Sandholt, P. E., and C. J. Farrugia. "Monitoring magnetosheath-magnetosphere interconnection topology from the aurora." Annales Geophysicae 20, no. 5 (2002): 629–37. http://dx.doi.org/10.5194/angeo-20-629-2002.

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Abstract. A strong southward rotation of the IMF (BZ from 5 to -6 nT in ~ 20 s) on 4 January 1995 caused an abrupt reconfiguration of midday aurorae and plasma convection consisting of the following: (1) the red-line aurora associated with magnetosheath plasma transfer at the low-latitude magnetopause appeared at the same time that (2) the green-line aurora from precipitating energetic plasma sheet particles equatorward of the cusp (near the open-closed field line boundary) weakened visibly and shifted equatorward, (3) the high-latitude aurora during the previous northward IMF, which is associ
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5

Blixt, E. M., M. J. Kosch, and J. Semeter. "Relative drift between black aurora and the ionospheric plasma." Annales Geophysicae 23, no. 5 (2005): 1611–21. http://dx.doi.org/10.5194/angeo-23-1611-2005.

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Abstract. Black auroras are recognized as spatially well-defined regions within uniform diffuse aurora where the optical emission is significantly reduced. Although a well studied phenomenon, there is no generally accepted theory for black auroras. One theory suggests that black regions are formed when energetic magnetospheric electrons no longer have access to the loss cone. If this blocking mechanism drifts with the source electron population in the magnetosphere, black auroras in the ionosphere should drift eastward with a velocity that increases with the energy of the precipitating electro
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6

Yahnin, A. G., V. A. Sergeev, B. B. Gvozdevsky, and S. Vennerstrøm. "Magnetospheric source region of discrete auroras inferred from their relationship with isotropy boundaries of energetic particles." Annales Geophysicae 15, no. 8 (1997): 943–58. http://dx.doi.org/10.1007/s00585-997-0943-z.

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Abstract. According to observations, the discrete auroral arcs can sometimes be found, either deep inside the auroral oval or at the poleward border of the wide (so-called double) auroral oval, which map to very different regions of the magnetotail. To find common physical conditions for the auroral-arc generation in these magnetotail regions, we study the spatial relationship between the diffuse and discrete auroras and the isotropic boundaries (IBs) of the precipitating energetic particles which can be used to characterise locally the equatorial magnetic field in the tail. From comparison of
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7

De Keyser, J., and M. Echim. "Auroral and sub-auroral phenomena: an electrostatic picture." Annales Geophysicae 28, no. 2 (2010): 633–50. http://dx.doi.org/10.5194/angeo-28-633-2010.

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Abstract. Many auroral and sub-auroral phenomena are manifestations of an underlying magnetosphere-ionosphere coupling. In the electrostatic perspective the associated auroral current circuit describes how the generator (often in the magnetosphere) is connected to the load (often in the ionosphere) through field-aligned currents. The present paper examines the generic properties of the current continuity equation that characterizes the auroral circuit. The physical role of the various elements of the current circuit is illustrated by considering a number of magnetospheric configurations, vario
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8

Borodkova, N. L., A. G. Yahnin, K. Liou, et al. "Plasma sheet fast flows and auroral dynamics during substorm: a case study." Annales Geophysicae 20, no. 3 (2002): 341–47. http://dx.doi.org/10.5194/angeo-20-341-2002.

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Abstract. Interball-1 observations of a substorm development in the mid-tail on 16 December 1998 are compared with the auroral dynamics obtained from the Polar UV imager. Using these data, the relationship between plasma flow directions in the tail and the location of the auroral activation is examined. Main attention is given to tailward and earth-ward plasma flows, interpreted as signatures of a Near Earth Neutral Line (NENL). It is unambiguously shown that in the mid-plasma sheet the flows were directed tailward when the auroral bulge developed equatorward of the spacecraft ionospheric foot
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9

Cumnock, J. A., and L. G. Blomberg. "Transpolar arc evolution and associated potential patterns." Annales Geophysicae 22, no. 4 (2004): 1213–31. http://dx.doi.org/10.5194/angeo-22-1213-2004.

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Abstract. We present two event studies encompassing detailed relationships between plasma convection, field-aligned current, auroral emission, and particle precipitation boundaries. We illustrate the influence of the Interplanetary Magnetic Field By component on theta aurora development by showing two events during which the theta originates on both the dawn and dusk sides of the auroral oval. Both theta then move across the entire polar region and become part of the opposite side of the auroral oval. Electric and magnetic field and precipitating particle data are provided by DMSP, while the P
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10

Rycroft, M. J. "Auroral plasma dynamics." Journal of Atmospheric and Terrestrial Physics 57, no. 13 (1995): 1668. http://dx.doi.org/10.1016/0021-9169(95)90035-7.

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