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Titolo:
COROTATING PARTICLE ENHANCEMENTS OUT OF THE ECLIPTIC-PLANE
Autore:
SIMNETT GM; SAYLE K; ROELOF EC; TAPPIN SJ;
Indirizzi:
UNIV BIRMINGHAM,DEPT PHYS & SPACE RES BIRMINGHAM B15 2TT W MIDLANDS ENGLAND JOHNS HOPKINS UNIV,APPL PHYS LAB LAUREL MD 20723
Titolo Testata:
Geophysical research letters
fascicolo: 14, volume: 21, anno: 1994,
pagine: 1561 - 1564
SICI:
0094-8276(1994)21:14<1561:CPEOOT>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTERPLANETARY ACCELERATION; SECTOR STRUCTURE; SOLAR-WIND; NUCLEONS; ULYSSES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
10
Recensione:
Indirizzi per estratti:
Citazione:
G.M. Simnett et al., "COROTATING PARTICLE ENHANCEMENTS OUT OF THE ECLIPTIC-PLANE", Geophysical research letters, 21(14), 1994, pp. 1561-1564

Abstract

We have studied > 40 keV ion and electron enhancements seen at Ulysses from a series of corotating interaction regions (CIR), from mid-1992until the end of 1993. The event intensity increased up to latitude 20-degrees-S; after that the ion flux maxima decreased by approximately23%/deg while the electron maxima decreased more erratically, and more slowly, during the last half of 1993. After April, 1993, the electron increases lagged the ions by up to four days. The electron energy spectrum hardened both towards the end of the events and as the latitudewent above approximately 35-degrees. The electron/ion delays and the electron spectral hardening are related to the three-dimensional structure of the reverse shocks at high latitudes. The H/He ratio at approximately 0.4-1.2 MeV/nucleon de creased towards the end of each event; the mean minimum value was 3.5+/-0.3, lower than observed in earlier studies of CIR-associated events near the ecliptic plane. The He increases have recurred with a period of 26.0 days. There have been two phase changes: +4.3 days (February 1993) and +2.4 days (August 1993), related to changes in the coronal structure of the source regions for the high speed solar wind streams.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/11/20 alle ore 20:15:30