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Titolo:
On the origin of impulsive electron events observed at 1 AU
Autore:
Krucker, S; Larson, DE; Lin, RP; Thompson, BJ;
Indirizzi:
Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA Univ Calif Berkeley Berkeley CA USA 94720 Sci Lab, Berkeley, CA 94720 USA NASA, Goddard Space Flight Ctr, Space Applicat Corp, Greenbelt, MD 20771 USA NASA Greenbelt MD USA 20771 Space Applicat Corp, Greenbelt, MD 20771 USA
Titolo Testata:
ASTROPHYSICAL JOURNAL
fascicolo: 2, volume: 519, anno: 1999,
parte:, 1
pagine: 864 - 875
SICI:
0004-637X(19990710)519:2<864:OTOOIE>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
WIND SPACECRAFT; SOLAR; PLASMA; FLARES;
Keywords:
Sun : flares; Sun : particle emission; Sun : radio radiation; Sun : X-rays, gamma rays;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Krucker, S Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA UnivCalif Berkeley Berkeley CA USA 94720 rkeley, CA 94720 USA
Citazione:
S. Krucker et al., "On the origin of impulsive electron events observed at 1 AU", ASTROPHYS J, 519(2), 1999, pp. 864-875

Abstract

A statistical survey of 12 impulsive electron events detected at energies down below 1 keV and 58 events detected above 25 keV observed at 1 AU by the 3-D Plasma and Energetic Particles experiment on the Wind spacecraft is presented. Timing analysis of the velocity dispersion reveals two different kinds of electron events: (1) events released from the Sun at the onset of a radio type IU: burst, which suggest that these electrons are part of the population producing the type III radio emission; and (2) events in which the electrons are released up to half an hour Later than the onset of the type III burst. These electrons therefore may be produced by a different acceleration mechanism than the population producing the radio emission. Both types of behavior can be observed during the same impulsive electron event at different energies, but most events show the same timing at all energies. At lower energies (<25 keV), type Iii-related impulsive electron events are more often observed (nine of 12 events), whereas at higher energies (>25 keV), events not related to type III bursts are more numerous (41 of 58). However, events of both classes are observed below 1 keV. Impulsive electronevents not related to type III radio bursts are observed to be proton rich, with an order-of-magnitude lower electron-to-proton ratio than events related to type III bursts. For roughly 3/4 of the events not related to type III bursts, large-scale coronal transient waves, also called EIT waves or coronal Moreton waves, are observed by the Extreme Ultraviolet Imaging Telescope (EIT) on board SOHO. Temporal and spatial correlations together with hydromagnetic simulationsshow that at least some impulsive electron events are more likely related to the propagating Moreton wave than to the hare phenomenon itself.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/07/20 alle ore 12:33:04