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Titolo:
IMF CONNECTION FOR ENERGETIC PROTONS OBSERVED AT ULYSSES VIA MIDLATITUDE SOLAR-WIND RAREFACTION REGIONS
Autore:
ROELOF EC; SIMNETT GM; ARMSTRONG TP;
Indirizzi:
JOHNS HOPKINS UNIV,APPL PHYS LAB,JOHNS HOPKINS RD LAUREL MD 20723 UNIV BIRMINGHAM,SCH PHYS & SPACE RES BIRMINGHAM B15 2TT W MIDLANDS ENGLAND UNIV KANSAS,DEPT PHYS & ASTRON LAWRENCE KS 66045
Titolo Testata:
Space science reviews
fascicolo: 1-2, volume: 72, anno: 1995,
pagine: 309 - 314
SICI:
0038-6308(1995)72:1-2<309:ICFEPO>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Keywords:
HELIOSPHERE; ENERGETIC PARTICLES; COROTATING HIGH-SPEED STREAMS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
8
Recensione:
Indirizzi per estratti:
Citazione:
E.C. Roelof et al., "IMF CONNECTION FOR ENERGETIC PROTONS OBSERVED AT ULYSSES VIA MIDLATITUDE SOLAR-WIND RAREFACTION REGIONS", Space science reviews, 72(1-2), 1995, pp. 309-314

Abstract

As Ulysses moved inward and southward front mid-1992 to early 1994 wenoticed the occasional occurrence of '':inter-events:'', lasting about. 10 days and falling between the recurrent events, observed at proton energies of 0.48-97 MeV, associated with Corotating Interaction Regions (CIR). These inter-events were present for several sequences of two or more solar rotations at intensity levels around 1% of those of the neighbouring main events. When we compared the Ulysses events with those measured on IMP-8 at 1 AU we saw that the inter-events appeared at Ulysses after tile extended emission (>10 days) of large fluxes of solar protons of the same energy that lasted at least one solar rotation at 1 AU. The inter-events fell completely within the rarefaction regions (dv/dt < 0) of the recurrent solar wind streams. The interplanetary magnetic field (IMF) lines in the rarefactions map back to the narrow range of longitudes at the Sun which mark the eastern edge of the source region of the high speed stream. Thus the inter-events are propagating at mid-latitudes to Ulysses along field lines free from stream-stream interactions. They are seen in the 0.39-1.28 MeV/nucleon He, which exhibit a faster decay, but, almost never in the 38-53 keV electrons. We show that the inter-events are unlikely to be accelerated by reverse shocks associated with the CIRs and that they are more likely tobe accelerated by sequences of solar events and transported along theIMF in the rarefactions of the solar wind streams.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/12/20 alle ore 15:55:46