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Titolo:
HELIOLATITUDE DEPENDENCE OF INTERPLANETARY HEAVY-IONS
Autore:
MACLENNAN CG; LANZEROTTI LJ; SIMNETT GM; SAYLE KA;
Indirizzi:
AT&T BELL LABS MURRAY HILL NJ 07974 UNIV BIRMINGHAM,SCH PHYS & SPACE RES BIRMINGHAM B15 2TT W MIDLANDS ENGLAND
Titolo Testata:
Geophysical research letters
fascicolo: 23, volume: 22, anno: 1995,
pagine: 3361 - 3364
SICI:
0094-8276(1995)22:23<3361:HDOIH>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
AU; ACCELERATION; ENHANCEMENTS; NUCLEONS; REGIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
25
Recensione:
Indirizzi per estratti:
Citazione:
C.G. Maclennan et al., "HELIOLATITUDE DEPENDENCE OF INTERPLANETARY HEAVY-IONS", Geophysical research letters, 22(23), 1995, pp. 3361-3364

Abstract

In its rapid traversal of 80 degrees of heliolatitude from the southern solar pole to the equator, the HI-SCALE instrument on the Ulysses spacecraft measured the composition of ions accelerated at the co-rotating interaction regions (CIRs) that it crossed. We compare ion composition measurements as a function of heliolatitude during this traversalto those made on the ascent to the southern solar pole. The C/O ratio(similar to 1) in the fast traverse at similar to 1.4 AU is found to be about twice the value (similar to 0.5) found previously in the ecliptic as well as at intermediate; latitudes beyond similar to 2 AU. Forthe CIR-associated events in the southerly high speed solar wind stream, the ion intensity enhancements are found to decrease monotonicallywith increasing heliolatitude once Ulysses crossed similar to 20 degrees S. Thus, the optimum region for CIR-related particle acceleration in solar minimum conditions occurs near the boundary of the current sheet at distances between the orbits of Mars and Jupiter. These results, together with HI-SCALE results on the heliolatitude dependence of anomalous oxygen suggest that the lower value of the C/O ratio arises from the enhanced (relative to 1 AU) abundance of low energy anomalous Oat heliolatitudes beyond the current sheet and distances beyond similar to 2 AU.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 21:33:58