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Titolo:
ORIGIN OF STREAMER MATERIAL IN THE OUTER CORONA
Autore:
WANG YM; SHEELEY NR; WALTERS JH; BRUECKNER GE; HOWARD RA; MICHELS DJ; LAMY PL; SCHWENN R; SIMNETT GM;
Indirizzi:
USN,RES LAB,EO HULBURT CTR SPACE RES WASHINGTON DC 20375 ASTRON SPATIALE LAB F-37189 MARSEILLE 12 FRANCE MAX PLANCK INST AERON D-37189 KATLENBURG DUHM GERMANY UNIV BIRMINGHAM,SCH PHYS & SPACE RES BIRMINGHAM B15 2TT W MIDLANDS ENGLAND
Titolo Testata:
The Astrophysical journal
fascicolo: 2, volume: 498, anno: 1998,
parte:, 2
pagine: 165 -
SICI:
0004-637X(1998)498:2<165:OOSMIT>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOLAR-WIND;
Keywords:
INTERPLANETARY MEDIUM; SOLAR WIND; 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 OF STREAMER MATERIAL IN THE OUTER CORONA", The Astrophysical journal, 498(2), 1998, pp. 165

Abstract

We investigate the nature and origin of the outward-moving density inhomogeneities (''blobs'') detected previously with the Large Angle andSpectrometric Coronagraph on the Solar and Heliospheric Observatory. The blobs are concentrated around the thin plasma layer that surroundsthe heliospheric current sheet and that constitutes the outer streamer belt; they represent only a small, fluctuating component of the total density within the plasma sheet. As noted before in Sheeley et al., blobs are characterized by low speeds and are continually emitted fromthe elongated tips of helmet streamers at 3-4 R. from Sun center. We suggest that both the blobs and the plasma sheet itself represent closed-field material injected into the solar wind as a result of footpoint exchanges between the stretched helmet-streamer loops and neighboring open field lines. The plasma sheet is thus threaded by newly reconnected, open magnetic field lines, which lend the white-light streamer belt its filamentary appearance. Since in situ observations at 1 AU show that the slow wind (with speeds below 500 km s(-1)) spreads over an angular extent much greater than the less than or similar to 3 degreeswidth of the plasma sheet, we deduce that a major component of this wind must originate outside the helmet streamers (i.e., from just inside coronal holes).

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Documento generato il 04/12/20 alle ore 22:24:01