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Titolo:
Extremely cold electrons in the January 1997 magnetic cloud
Autore:
Larson, DE; Lin, RP; Steinberg, J;
Indirizzi:
Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA Univ Calif Berkeley Berkeley CA USA 94720 Sci Lab, Berkeley, CA 94720 USA Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA Univ Calif Berkeley Berkeley CA USA 94720 pt Phys, Berkeley, CA 94720 USA MIT, Cambridge, MA 02139 USA MIT Cambridge MA USA 02139MIT, Cambridge, MA 02139 USA
Titolo Testata:
GEOPHYSICAL RESEARCH LETTERS
fascicolo: 2, volume: 27, anno: 2000,
pagine: 157 - 160
SICI:
0094-8276(20000115)27:2<157:ECEITJ>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOLAR-WIND ELECTRONS; 1 AU; TEMPERATURE; SPACECRAFT; PLASMA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
15
Recensione:
Indirizzi per estratti:
Indirizzo: Larson, DE Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA UnivCalif Berkeley Berkeley CA USA 94720 rkeley, CA 94720 USA
Citazione:
D.E. Larson et al., "Extremely cold electrons in the January 1997 magnetic cloud", GEOPHYS R L, 27(2), 2000, pp. 157-160

Abstract

The 3D Plasma and Energetic Particle (3DP) instrument on the WIND spacecraft detected extremely cold solar wind electrons in the January 10-11, 1997 magnetic cloud, similar to 4 times lower temperature than any previously reported measurement. Detailed fits to the electron distributions show that the core electron temperature, T-ec, generally ranged from similar to 1 to 4.5 eV through the cloud, dropping to a low of similar to 0.7 eV in an unusually dense (n>similar to 150 cm(-3)) region in the trailing portion of the cloud. Due to the extremely low average electron temperature T-e and high density, the ions and electrons are collisionally coupled as confirmed by T-e=T-p, the first such observation in the solar wind. For most of the cloud the halo density is very low (n(eh)<similar to 0.1 cm(-3)), implying magnetic disconnection from the Sun. Correlations in T-e and T-p are observed throughout the cloud and are particularly evident when n(eh) is low. We suggest the diminished halo density has reduced a significant heat source to the core population, thus allowing the electrons to cool more thoroughly. Furthermore, we show that Coulomb collisions are a significant mechanism of energy transfer between the halo and core distributions under normal solar windconditions.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/07/20 alle ore 12:22:31