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Titolo:
Observations of the acceleration of polar solar wind near solar maximum
Autore:
Tappin, SJ; Simnett, GM; Lyons, MA;
Indirizzi:
Univ Birmingham, Sch Phys & Astron, Birmingham, W Midlands, England Univ Birmingham Birmingham W Midlands England ngham, W Midlands, England
Titolo Testata:
SPACE SCIENCE REVIEWS
fascicolo: 1-4, volume: 97, anno: 2001,
pagine: 17 - 20
SICI:
0038-6308(2001)97:1-4<17:OOTAOP>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
SPEEDS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
4
Recensione:
Indirizzi per estratti:
Indirizzo: Tappin, SJ Univ Birmingham, Sch Phys & Astron, Birmingham, W Midlands, England Univ Birmingham Birmingham W Midlands England dlands, England
Citazione:
S.J. Tappin et al., "Observations of the acceleration of polar solar wind near solar maximum", SPACE SCI R, 97(1-4), 2001, pp. 17-20

Abstract

In a previous paper (Tappin et al., 1999) we used cross-correlation analysis of high-cadence observations with the LASCO coronagraphs to trace the acceleration of the solar wind at low latitudes. In this paper we present a similar analysis carried out over the North pole of the Sun. The observations which were made in March 2000 with the C3 coronagraph show low bulk flow speeds (comparable to or lower than those seen at the equator in early 1998). We observe the acceleration continuing to the edge of the C3 field of view at about 30 R-circle dot. We also observe, as at low latitude, a high-speed tail but now reaching out well beyond 2000 km s(-1). We do not see a clear signature of a fast polar bulk flow. We therefore conclude that at thisphase of the solar cycle, any fast bulk flow occupies only a small part ofthe line of sight and is therefore overwhelmed by the denser slow solar wind in these observations. We also show that the fast component is consistent with observed solar wind speeds at 1 AU.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/12/20 alle ore 15:37:23