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Titolo:
Earthward flow bursts, auroral streamers, and small expansions
Autore:
Nakamura, R; Baumjohann, W; Schodel, R; Brittnacher, M; Sergeev, VA; Kubyshkina, M; Mukai, T; Liou, K;
Indirizzi:
Max Planck Inst Extraterr Phys, Garching, Germany Max Planck Inst Extraterr Phys Garching Germany Phys, Garching, Germany Ostereich Akad Wissensch, Inst Weltraumforsch, A-8062 Graz, Austria Ostereich Akad Wissensch Graz Austria A-8062 orsch, A-8062 Graz, Austria Univ Washington, Geophys Program, Seattle, WA 98195 USA Univ Washington Seattle WA USA 98195 ophys Program, Seattle, WA 98195 USA St Petersburg State Univ, Inst Phys, St Petersburg 198904, Russia St Petersburg State Univ St Petersburg Russia 198904 burg 198904, Russia Inst Space & Astronaut Sci, Sagamihara, Kanagawa 229, Japan Inst Space & Astronaut Sci Sagamihara Kanagawa Japan 229 agawa 229, Japan Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA Johns Hopkins Univ Laurel MD USA 20723 ppl Phys Lab, Laurel, MD 20723 USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
fascicolo: A6, volume: 106, anno: 2001,
pagine: 10791 - 10802
SICI:
0148-0227(20010601)106:A6<10791:EFBASA>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
CENTRAL PLASMA SHEET; INNER MAGNETOTAIL; BULK FLOWS; ASSOCIATION; INTENSIFICATIONS; INJECTIONS; DYNAMICS; MODEL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Nakamura, R Max Planck Inst Extraterr Phys, Postf 1312, Garching, Germany Max Planck Inst Extraterr Phys Postf 1312 Garching Germany y
Citazione:
R. Nakamura et al., "Earthward flow bursts, auroral streamers, and small expansions", J GEO R-S P, 106(A6), 2001, pp. 10791-10802

Abstract

Earthward flow bursts associated with small auroral expansions, including pseudobreakups, and auroral streamers are studied by using Geotail plasma and magnetic field data and Polar ultraviolet imager data. These flow burstsare accompanied by dipolarization and decrease in the plasma pressure, which are consistent with the characteristics of so-called bubbles, and have atimescale of 2.5 min on average. Based on a statistical study of the flow bursts, it is shown that the location of the flows are centered about 0.4 hour magnetic local time east of the center of auroral expansion and are localized with a width of 3 - 5 R-E. This relationship supports the idea that a dawn-to-dusk polarization electric field is created in the bubble to enhance the flows. The flow bursts associated with the small expansions, which are mainly observed in the region earthward of 15 R-E, shaw more distinct signatures of compression at the front side of the flow, which possibly leads to the stopping of these flows. Flow bursts related to auroral streamers,which are observed mainly tailward of 15 R-E, take place during relativelythick plasma sheet configurations, and are accompanied by stronger flow shear.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/12/19 alle ore 14:50:49