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Titolo:
ORIGIN AND EVOLUTION OF CORONAL STREAMER STRUCTURE DURING THE 1996 MINIMUM ACTIVITY PHASE
Autore:
WANG YM; SHEELEY NR; HOWARD RA; KRAEMER JR; RICH NB; ANDREWS MD; BRUECKNER GE; DERE KP; KOOMEN MJ; KORENDYKE CM; MICHELS DJ; MOSES JD; PASWATERS SE; SOCKER DG; WANG D; LAMY PL; LLEBARIA A; VIBERT D; SCHWENN R; SIMNETT GM;
Indirizzi:
USN,RES LAB,EO HULBURT CTR SPACE RES WASHINGTON DC 20375 ASTRON SPATIALE LAB F-13376 MARSEILLE 12 FRANCE MAX PLANCK INST AERON D-37189 KATLENBURG DUHM GERMANY UNIV BIRMINGHAM,DEPT PHYS & SPACE RES BIRMINGHAM B15 2TT W MIDLANDS ENGLAND
Titolo Testata:
The Astrophysical journal
fascicolo: 2, volume: 485, anno: 1997,
parte:, 1
pagine: 875 - 889
SICI:
0004-637X(1997)485:2<875:OAEOCS>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUNS POLAR FIELDS; SOLAR CORONA; MAGNETIC-FIELD;
Keywords:
SUN, ACTIVITY; SUN, CORONA; SUN, MAGNETIC FIELDS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
18
Recensione:
Indirizzi per estratti:
Citazione:
Y.M. Wang et al., "ORIGIN AND EVOLUTION OF CORONAL STREAMER STRUCTURE DURING THE 1996 MINIMUM ACTIVITY PHASE", The Astrophysical journal, 485(2), 1997, pp. 875-889

Abstract

We employ coronal extrapolations of solar magnetograph data to interpret observations of the white-light streamer structure made with the LASCO coronagraph in 1996. The topological appearance of the streamer belt during the present minimum activity phase is well described by a model in which the Thomson-scattering electrons are concentrated arounda single, warped current sheet encircling the Sun. Projection effectsgive rise to bright, jet-like structures or spikes whenever the current sheet is viewed edge-on; multiple spikes are seen if the current sheet is sufficiently wavy. The extreme narrowness of these features in polarized images indicates that the scattering layer is at most a few degrees wide. We model the evolution of the streamer belt from 1996 April to 1996 September and show that the effect of photospheric activity on the streamer belt topology depends not just on the strength of the erupted magnetic flux, but also on its longitudinal phase relative to the background field. Using flux transport simulations, we also demonstrate how the streamer belt would evolve during a prolonged absence of activity.

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Documento generato il 03/12/20 alle ore 16:00:03